Journal articles on the topic 'CuO nanofluid'
To see the other types of publications on this topic, follow the link: CuO nanofluid.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'CuO nanofluid.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Alfian, Devia Gahana Cindi, Nicholas Binsar Pandapotan, Muhammad Syaukani, Dicky J. Silitonga, Devy Setiorini Sa’adiyah, and Taurista Perdana Syawitri. "Experimental Investigation of The Heat Transfer Characteristics of Hybrid Nanofluid Al₂O₃CuO-Distilled Water with The Variation of Concentration Ratios." Jurnal Tekno Insentif 17, no. 1 (April 30, 2023): 11–21. http://dx.doi.org/10.36787/jti.v17i1.940.
Abstract:
Abstrak
Panas berlebih yang terjadi pada CPU (Central Processing Unit) komputer dapat menyebabkan penurunan kinerja komputer. Penggunaan fluida pendingin yang diaplikasikan pada perangkat waterblock dapat membantu penurunan temperatur panas berlebih. Salah satu fluida pendingin yang dapat digunakan pada waterblok adalah fluida pendingin jenis nanofluida. Nanofluida merupakan fluida kerja yang mengandung nanopartikel dan fluida dasar untuk dialirkan pada perangkat pengujian. Penelitian ini dilakukan untuk mengetahui karakteristik perpindahan panas dari perangkat uji waterblock dengan menggunakan variasi perbandingan konsentrasi 25% Al2O3: 75% CuO, 50% Al2O3: 50% CuO, 75% Al2O3: 25% CuO dan fraksi volume 0,3% dengan komposisi yang terdiri dari nanofluida Al2O3-CuO/Air Distilasi. Metode pembuatan nanofluida dilakukan dengan proses sonikasi selama 4 jam. Berdasarkan hasil penelitian menunjukkan penurunan temperatur heater paling signifikan ditunjukkan pada hybrida nanofluida dengan perbandingan 75% Al2O3 : 25% CuO sebesar 24,1oC dengan debit 1 liter/menit, sedangkan pada air distilasi penurunan temperatur heater tertinggi ditunjukkan oleh flowrate 1,9 liter/menit 3,4oC. Besarnya nilai koefisien perpindahan panas tertinggi ditunjukkan pada variasi 75% Al2O3 : 25% CuO pada rentang Bilangan Reynolds 41,9-113,7 dengan nilai tertinggi sebesar 345.798 W/m2ᵒC. Hasil pengujian menunjukkan bahwa penggunaan hibrida nanofluida dapat mengurangi temperatur lebih baik daripada air distilasi.
Abstract
Excessive heat that occurs in the computer's CPU (Central Processing Unit) can cause a decrease in computer performance. Cooling fluid applied to the waterblock device can help reduce overheating temperatures. One of the cooling fluids used in waterblocks is the cooling fluid of the nanofluid type. Nanofluid is a working fluid that contains nanoparticles and base fluid to flow on the testing device. This research was conducted to determine the heat transfer characteristics of the waterblock test device using variations in the concentration ratio of 25% Al2O3 : 75% CuO, 50% Al2O3 : 50% CuO, 75% Al2O3 : 25% CuO and a volume fraction of 0.3% with the same composition. consists of nanofluid Al2O3-CuO/Distilled Water. The method of making nanofluids is done by sonication process for 4 hours. Based on the study's results, the most significant decrease in heater temperature was shown in nanofluid hybrids with a ratio of 75% Al2O3 : 25% CuO of 24.1oC with a discharge of 1 liter/minute. In contrast, the highest decrease in heater temperature in distilled water was shown by a flow rate of 1.9 liters/minute 3.4oC. The highest value of the heat transfer coefficient is shown in the variation of 75% Al2O3 : 25% CuO in the Reynolds number range of 41.9-113.7 with the highest value of 345,798 W/m2ᵒC. The test results show that nanofluid hybrids can reduce temperature better than distilled water.
2
J.A., Ranga Babu, Kiran Kumar K., and Srinivasa Rao S. "Thermodynamic analysis of hybrid nanofluid based solar flat plate collector." World Journal of Engineering 15, no. 1 (February 12, 2018): 27–39. http://dx.doi.org/10.1108/wje-03-2017-0048.
Abstract:
Purpose This paper aims to present an analytical investigation of energy and exergy performance on a solar flat plate collector (SFPC) with Cu-CuO/water hybrid nanofluid, Cu/water and CuO/water nanofluids as collector running fluids. Design/methodology/approach Heat transfer characteristics, pressure drop and energy and exergy efficiencies of SFPC working on these nanofluids are investigated and compared. In this study, a comparison is made by varying the mass flow rates and nanoparticle volume concentration. Thermophysical properties of hybrid nanofluids are estimated using distinctive correlations available in the open literature. Then, the influence of these properties on energy and exergy efficiencies of SFPC is discussed in detail. Findings Energy analysis reveals that by introducing the hybrid nanoparticles in water, the thermal conductivity of the working fluid is enhanced by 17.52 per cent and that of the individual constituents is enhanced by 15.72 and 15.35 per cent for Cu/water and CuO/water nanofluids, respectively. This resulted in 2.16 per cent improvement in useful heat gain for hybrid nanofluid and 1.03 and 0.91 per cent improvement in heat gain for Cu/water and CuO/water nanofluids, respectively. In line with the above, the collector efficiency increased by 2.175 per cent for the hybrid nanofluid and 0.93 and 1.05 per cent enhancement for Cu/water and CuO/water nanofluids, respectively. Exergy analysis elucidates that by using the hybrid nanofluid, exergy efficiency is increased by 2.59 per cent, whereas it is 2.32 and 2.18 per cent enhancement for Cu/water and CuO/water nanofluids, respectively. Entropy generation is reduced by 3.31, 2.35 and 2.96 per cent for Cu-CuO/water, Cu/water and CuO/water nanofluids, respectively, as compared to water. Research limitations/implications However, this is associated with a penalty of increment in pressure drop of 2.92, 3.09 and 2.74 per cent for Cu-CuO/water, Cu/water and CuO/water nanofluids, respectively, compared with water. Originality/value It is clear from the analysis that Cu-CuO/water hybrid nanofluids possess notable increment in both energy and exergy efficiencies to use them in SFPCs.
3
Prakash, Dr S. B., Kiran Ningappa Kotin, and Praveen Kumar M. "PREPARATION AND CHARACTERIZATION OF NANOFLUID (CUO – WATER, TIO2 – WATER)." EPH - International Journal of Science And Engineering 6, no. 3 (September 27, 2020): 13–18. http://dx.doi.org/10.53555/eijse.v6i3.70.
Abstract:
Over the past decade, research in heat transfer enhancement using nanofluids - suspensions of nanometer-sized solid particles in a base liquid has received considerable attention all over the world. Several theoretical works to predict the effective thermo physical properties of the suspension, range from a homogeneous model to complex two phase flow model have been proposed. This work explains the preparation methods of the nanofluids (CuO-water, TiO2-water) and characterizing the nanofluid of different concentrations (0.025%, 0.05%, 0.075%, 0.1% and 0.5%). Here in this work used to calculate the density, viscosity, specific heat of nanofluids and steady state parallel plate method is used to calculate thermal conductivity of nanofluids experimentally. Results of this work show the increase in thermal conductivity, viscosity of the nanofluid by increasing the concentration and decrease of density and specific heat of nanofluid by increasing the concentration.
4
Putra, Nandy, Wayan Nata Septiadi, Rosari Saleh, Rardi Artono Koestoer, and Suhendro Purbo Prakoso. "The Effect of CuO-Water Nanofluid and Biomaterial Wick on Loop Heat Pipe Performance." Advanced Materials Research 875-877 (February 2014): 356–61. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.356.
Abstract:
The determinants of heat pipe performances are its wick and working fluid, instead of controlled by the material, dimension, and the shape of heat pipe. This study aimed to determine the effect of using nanofluid on the performance of Loop heat pipes (LHP) with CuO-water nanofluid that using biomaterials wick. LHP was made of 8 mm diameter copper pipe, with the diameter of evaporator and the condenser was 20 mm respectively and the length of the heat pipe was 100 mm. The wick was made of biomaterials Collaria Tabulate and the working fluid was CuO-water nanofluids where the CuO nanoparticles were synthesized by sol-gel method. The characteristic of the Tabulate Collaria biomaterial as a wick in LHP was also investigated in this experiment. The results of the experiments showed that the temperature differences between the evaporator and condenser sections with the biomaterial wick and CuO-water nanofluid were less than those using pure water. These results make the biomaterial (Collar) and nanofluids are attractive both as wick and working fluid in LHP technology. Keywords: loop heat pipe, wick, biomaterial, nanofluid.
5
Mostafizur, R. M., M. G. Rasul, M. N. Nabi, R. Haque, and M. I. Jahirul. "Thermodynamic Analysis of a Flat Plate Solar Collector with Different Hybrid Nanofluids as Working Medium—A Thermal Modelling Approach." Nanomaterials 13, no. 8 (April 9, 2023): 1320. http://dx.doi.org/10.3390/nano13081320.
Abstract:
In this study, the performance of hybrid nanofluids in a flat plate solar collector was analysed based on various parameters such as entropy generation, exergy efficiency, heat transfer enhancement, pumping power, and pressure drop. Five different base fluids were used, including water, ethylene glycol, methanol, radiator coolant, and engine oil, to make five types of hybrids nanofluids containing suspended CuO and MWCNT nanoparticles. The nanofluids were evaluated at nanoparticle volume fractions ranging from 1% to 3% and flow rates of 1 to 3.5 L/min. The analytical results revealed that the CuO-MWCNT/water nanofluid performed the best in reducing entropy generation at both volume fractions and volume flow rate when compared to the other nanofluids studied. Although CuO-MWCNT/methanol showed better heat transfer coefficients than CuO-MWCNT/water, it generated more entropy and had lower exergy efficiency. The CuO-MWCNT/water nanofluid not only had higher exergy efficiency and thermal performance but also showed promising results in reducing entropy generation.
6
Sami, Samuel. "Analysis of Nanofluids Behavior in a PV-Thermal-Driven Organic Rankine Cycle with Cooling Capability." Applied System Innovation 3, no. 1 (February 11, 2020): 12. http://dx.doi.org/10.3390/asi3010012.
Abstract:
This paper discusses the performance of nanofluids in a PV Thermal-driven Organic Rankine Cycle (ORC) with cooling capabilities. This study was intended to investigate the enhancement effect and characteristics of nanofluids; Al2O3, CuO, Fe3O4 and SiO2 on the performance the hybrid system composed of PV Thermal, ORC and cooling coil. The quaternary refrigerant mixture used in the ORC cycle to enhance the ORC efficiency is an environmentally sound refrigerant mixture composed of R152a, R245fa, R125, and R1234fy. It was shown that the enhancement of the efficiency of the hybrid system in question is significantly dependent upon not only the solar radiation but also the nanofluids concentration and the type of nanofluid as well as the fluid temperature driving the ORC. A higher hybrid system efficiency has been overserved with nanofluid CuO. Moreover, it has been also shown that on the average, the hybrid system efficiency was higher 17% with nanofluid CuO compared to water as the heat transfer fluid. In addition, it was also observed that the higher cooling effect produced is significantly increased with the use of the nanofluid CuO compared to the other nanofluids under investigation and water as heat transfer fluid. The results observed in this paper on ORC efficiency and PV solar panel efficiency are comparable to what has been published in the literature.
7
Thakur, Archana, Alakesh Manna, and Sushant Samir. "Experimental investigation of nanofluids in minimum quantity lubrication during turning of EN-24 steel." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 5 (October 14, 2019): 712–29. http://dx.doi.org/10.1177/1350650119878286.
Abstract:
The present work evaluates the performance of different machining environments such as dry, wet, minimum quantity lubrication, Al2O3 nanofluids based minimum quantity lubrication, CuO nanofluids based minimum quantity lubrication and Al–CuO hybrid nanofluids based minimum quantity lubrication on machining performance characteristics during turning of EN-24. The nanofluids and hybrid nanofluids were prepared by adding the Al2O3, CuO and Al2O3/CuO to the soluble oil with different weight percentages (0.5 wt.%, 1 wt.%, 1.5 wt.%). The thermal and tribological properties of hybrid nanofluid and nanofluids were analyzed. The comparative analysis of different turning environments has been done. From comparative analysis it is clearly observed that the nanofluids and hybrid nanofluid shows better performance during turning of EN-24 steel. So there is a need for optimization of parameters during turning of EN-24 under Al2O3 nanofluids based minimum quantity lubrication, CuO nanofluids based minimum quantity lubrication and Al–CuO hybrid nanofluids based minimum quantity lubrication. The optimization of parameters has been done by response surface methodology. The significance of developed model was identified from analysis of variance. Multi-response optimization was done using desirability function approach. To verify the accuracy of developed models, confirmatory experiments were performed. The experimental results reveal that Al–CuO hybrid nanofluids based minimum quantity lubrication significantly improves surface quality, reduces cutting temperature and cutting forces.
8
Mostafizur, R. M., M. G. Rasul, and M. N. Nabi. "Energy and Exergy Analyses of a Flat Plate Solar Collector Using Various Nanofluids: An Analytical Approach." Energies 14, no. 14 (July 16, 2021): 4305. http://dx.doi.org/10.3390/en14144305.
Abstract:
Energy and exergy (EnE) efficiencies are considered the most important parameters to compare the performance of various thermal systems. In this paper, an analysis was carried out for EnE efficiencies of a flat plate solar collector (FPSC) using four different kinds of nanofluids as flowing mediums, namely, Al2O3/water, MgO/water, TiO2/water, and CuO/water, and compared with water as a flowing medium (traditional base fluid). The analysis considered nanofluids made of nanomaterials’ volume fractions of 1–4% with water. The volume flow rates of nanofluids and water were 1 to 4 L/min. The solar collector′s highest EnE efficiency values were obtained for CuO/water nanofluid among the four types of nanofluids mentioned above. The EnE efficiencies of the CuO nanofluid-operated solar collector were 38.21% and 34.06%, respectively, which is significantly higher than that of water-operated solar collectors. For the same volume flow rate, the mass flow rate was found to be 15.95% higher than water for the CuO nanofluid. The EnE efficiency of FPSC can also be increased by increasing the density and reducing the specific heat of the flowing medium.
9
Senthilraja, S., KCK Vijayakumar, and R. Gangadevi. "Effects of Specific Fuel Consumption and Exhaust Emissions of Four Stroke Diesel Engine with CuO/Water Nanofluid as Coolant." Archive of Mechanical Engineering 64, no. 1 (March 1, 2017): 111–21. http://dx.doi.org/10.1515/meceng-2017-0007.
Abstract:
Abstract This article reports the effects of CuO/water based coolant on specific fuel consumption and exhaust emissions of four stroke single cylinder diesel engine. The CuO nanoparticles of 27 nm were used to prepare the nanofluid-based engine coolant. Three different volume concentrations (i.e 0.05%, 0.1%, and 0.2%) of CuO/water nanofluids were prepared by using two-step method. The purpose of this study is to investigate the exhaust emissions (NOx), exhaust gas temperature and specific fuel consumption under different load conditions with CuO/water nanofluid. After a series of experiments, it was observed that the CuO/water nanofluids, even at low volume concentrations, have a significant influence on exhaust emissions. The experimental results revealed that, at full load condition, the specific fuel consumption was reduced by 8.6%, 15.1% and 21.1% for the addition of 0.05%, 0.1% and 0.2% CuO nanoparticles with water, respectively. Also, the emission tests were concluded that 881 ppm, 853 ppm and 833 ppm of NOx emissions were observed at high load with 0.05%, 0.1% and 0.2% volume concentrations of CuO/water nanofluids, respectively.
10
Wang, Wei, Bo Zhang, Lanhua Cui, Hongwei Zheng, Jiří Jaromír Klemeš, and Jin Wang. "Numerical study on heat transfer and flow characteristics of nanofluids in a circular tube with trapezoid ribs." Open Physics 19, no. 1 (January 1, 2021): 224–33. http://dx.doi.org/10.1515/phys-2021-0022.
Abstract:
Abstract This study aims to investigate heat transfer and flow characteristics of ethylene glycol/water (EGW) and CuO–EGW nanofluids in circular tubes with and without trapezoid ribs. Nusselt number and friction factor in tubes with trapezoid ribs are analysed under a constant heat flux by changing rib bottom angles. This study compares the convective heat transfer coefficients of 6 vol.% CuO–EGW nanofluid and base fluid. It is found that under a constant Reynolds number, the Nusselt number and friction factor for CuO–EGW nanofluid and base fluid increase with an increase in the inclination angle. The Nusselt number for the CuO–EGW nanofluid in the tube with 75° rib bottom angle averagely increases by 135.8% compared to that in the smooth tube, and the performance evaluation criterion is 1.64.
11
Zheng, Dan, Jin Wang, Yu Pang, Zhanxiu Chen, and Bengt Sunden. "Heat transfer performance and friction factor of various nanofluids in a double-tube counter flow heat exchanger." Thermal Science 24, no. 6 Part A (2020): 3601–12. http://dx.doi.org/10.2298/tsci200323280z.
Abstract:
Experimental research was conducted to reveal the effects of nanofluids on heat transfer performance in a double-tube heat exchanger. With nanoparticle weight fraction of 0.5-2.0% and Reynolds number of 4500-14500, the flow resistance and heat transfer were analyzed by using six nanofluids, i.e., CuO-water, Al2O3-water, Fe3O4-water, ZnO-water, SiC-water, SiO2-water nanofluids. Results show that SiC-water nanofluid with a weight concentration of 1.5% provides the best improvement of heat transfer performance. 1.0% CuO-water and 0.5% SiO2-water nanofluids have lower friction factors in the range of Reynolds number from 4500-14500 compared to the other nanofluids. Based on test results of heat transfer performance and flow resistance, the 1.0% CuO-water nanofluid shows a great advantage due to a relatively high heat transfer performance and a low friction factor. Finally, empirical formulae of Nusselt numbers for various nanofluids were established based on experimental data tested in the double-tube heat exchanger.
12
Ajay, Ketan, and Lal Kundan. "Combined Experimental and CFD Investigation of the Parabolic Shaped Solar Collector Utilizing Nanofluid (CuO-H2O and SiO2-H2O) as a Working Fluid." Journal of Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/5729576.
Abstract:
Nanoscience application plays a major role in heat transfer related problems. A nanofluid is basically a suspension of fine sized nanomaterials in base fluids like water, Therminol VP-1, ethylene glycol, and other heat transfer fluids. This paper evaluates the possible application of nanofluid in parabolic shaped concentrating solar collector using both experimental and CFD analysis. Different types of nanomaterials used are SiO2and CuO of 20 nm average size. Nanofluids of SiO2-H2O (DI) and CuO-H2O (DI) of 0.01% volume concentration are used. Flow rates of 40 LPH and 80 LPH are used. ANSYS FLUENT 14.5 is used for carrying out CFD investigation. 3D temperature distribution of absorber tube is obtained using numerical investigation and the result is compared with the experimental one. Improvement in efficiency of collector of about 6.68% and 7.64% is obtained using 0.01% vol. conc. SiO2-H2O (DI) nanofluid and 0.01% vol. conc. CuO-H2O (DI) nanofluid, respectively, as compared to H2O (DI) at 40 LPH while at 80 LPH improvement in efficiency of collector of about 7.15% and 8.42% is obtained using 0.01% vol. conc. SiO2-H2O (DI) nanofluid and 0.01% vol. conc. CuO-H2O (DI) nanofluid, respectively, as compared to H2O (DI). Both experimental and CFD temperature results are in good agreement.
13
Dzido, Grzegorz, Michał Drzazga, Marcin Lemanowicz, and Andrzej T. Gierczycki. "Investigations on heat and momentum transfer in CuO-water nanofluid." Archives of Thermodynamics 36, no. 2 (June 1, 2015): 49–59. http://dx.doi.org/10.1515/aoter-2015-0014.
Abstract:
AbstractThis paper presents results of investigations on the application of CuO-water nanofluids for intensification of convective heat transfer. Performance of nanofluids with 2.2 and 4.0 vol.% CuO NPs (nanoparticles) content were examined with regard to heat transfer coefficient and pressure losses in case of turbulent flow in a tube. Negligible impact of examined nanofluid on heat transfer improvement was found. Moreover, measured pressure losses significantly exceeded those determined for primary base liquid. The observations showed that application of nanofluid for heat transfer intensification with a relatively high solid load in the examined flow range is rather controversial.
14
Lanjewar, Abhishek, Bharat Bhanvase, Divya Barai, Shivani Chawhan, and Shirish Sonawane. "Intensified Thermal Conductivity and Convective Heat Transfer of Ultrasonically Prepared CuO–Polyaniline Nanocomposite Based Nanofluids in Helical Coil Heat Exchanger." Periodica Polytechnica Chemical Engineering 64, no. 2 (June 3, 2019): 271–82. http://dx.doi.org/10.3311/ppch.13285.
Abstract:
In this study, investigation of convective heat transfer enhancement with the use of CuO–Polyaniline (CuO–PANI) nanocomposite basednanofluid inside vertical helically coiled tube heat exchanger was carried out experimentally. In these experiments, the effects of different parameters such as Reynolds number and volume % of CuO–PANI nanocomposite in nanofluid on the heat transfer coefficient of base fluid have been studied. In order to study the effect of CuO–PANI nanocomposite based nanofluid on heat transfer, CuO nanoparticles loaded in PANI were synthesized in the presence of ultrasound assisted environment at different loading concentration of CuO nanoparticles (1, 3 and 5 wt.%). Then the nanofluids were prepared at different concentrations of CuO–PANI nanocomposite using water as a base fluid. The 1 wt.% CuO–PANI nanocomposite was selected for the heat transfer study for nanofluid concentration in the range of 0.05 to 0.3 volume % and Reynolds number range of was 1080 to 2160 (±5). Around 37 % enhancement in the heat transfer coefficient was observed for 0.2 volume % of 1 wt.% CuO–PANI nanocomposite in the base fluid. In addition, significant enhancement in the heat transfer coefficient was observed with an increase in the Reynolds number and percentage loading of CuO nanoparticle in Polyaniline (PANI).
15
Subramaniyan, A. L., Arun Kumar, Sethupathi, T. Sorna Kumar, and R. Ilangovan. "Preparation and Stability Characterization of Copper Oxide Nanofluid by Two Step Method." Materials Science Forum 832 (November 2015): 139–43. http://dx.doi.org/10.4028/www.scientific.net/msf.832.139.
Abstract:
Copper oxide (CuO) nanofluids are prepared by two step method. CuO nanoparticles are prepared by sol gel method with Copper chloride as precursor and NaOH as a reducing agent. The prepared CuO nanoparticles are characterized by XRD, SEM and Particle size analyzer. XRD measurements reveal a grain size of 72nm .SEM image reveals an inhomogenous mixture of particles from 500 nm to 3500 nm with irregular morphology and few traces of CuO cones.. The particle size distribution of CuO particles is in the range of 1000-1600nm which is in accordance with the SEM results.CuO –Ethylene Glycol nanofluids are prepared by two step method by ultrasonication of obtained CuO particles.The stability of CuO nanofluid is given with a negative zeta potential of-22.5 mv.
16
Jen Wai, Ooi, Prem Gunnasegaran, and Hasril Hasini. "Effect of Hybrid Nanofluids Concentration and Swirling Flow on Jet Impingement Cooling." Nanomaterials 12, no. 19 (September 20, 2022): 3258. http://dx.doi.org/10.3390/nano12193258.
Abstract:
Nanofluids have become increasingly salient in heat transfer applications due to their promising properties that can be tailored to meet specific needs. The use of nanofluids in jet impingement flows has piqued the interest of numerous researchers owing to the significant heat transfer enhancement, which is vital in the technological dependence era in every aspect of life, particularly in engineering applications and industry. The aim of this current work is to investigate the effect of hybrid nanofluids concentration and swirling flow on jet impingement cooling through experimental approach. The hybrid nanofluids are prepared through a two-step method and the characterization process is carried out to study the stability and morphological structure of the sample prepared. The prepared hybrid nanofluids are then used as a cooling agent to evaluate the heat transfer performance of jet impinging system. The experimental investigation compares the performance of swirling impinging jets (SIJs) with conventional impinging jets (CIJs) under various jet-to-plate distance (H/D) ratios and nanofluid concentrations. The effects of adding surfactant on nanofluids are also examined. The heat transfer performance of ZnO/water and CuO/water mono-nanofluids are used as comparison to ZnO-CuO/water hybrid nanofluid. The results show that the thermal performance of ZnO-CuO/water hybrid nanofluid is better than that of the mono-nanofluids. Furthermore, as the mass fraction increases, the heat transfer rates improve. The effect of heat transmission by swirling impinging jets is better than that of conventional impinging jets under similar operating conditions. At H/D = 4, Re = 20,000 and hybrid nanofluid concentration at 0.1% under SIJ is observed to have the highest overall Nusselt number.
17
Das, Anshuman, Saroj Kumar Patel, and Sudhansu Ranjan Das. "Performance comparison of vegetable oil based nanofluids towards machinability improvement in hard turning of HSLA steel using minimum quantity lubrication." Mechanics & Industry 20, no. 5 (2019): 506. http://dx.doi.org/10.1051/meca/2019036.
Abstract:
The search of finding best vegetable oil based nanofluid from a set of three nanoparticle enriched cutting fluids for machining is core objective of the work. Extensive research has been done to replace conventional cutting fluids by nanofluids, but abundant analysis for vegetable oil based nanofluids is accomplished in this work which was not seen earlier. Also, the study investigated the cutting performance and comparative assessment towards machinability improvement during hard turning of high-strength-low-alloy (HSLA) AISI 4340 steel using four different compositions of nanofluids by minimum quantity lubrication (MQL) technique. Cutting are investigated and analyzed through this article during hard turning using minimum quantity lubrication (MQL). Cutting force, tool wear (flank and crater), surface integrity (surface roughness, residual stress, microhardness, and surface morphology), and chip morphology are considered as technological performance characteristics to evaluate the machinability of hardened AISI 4340 steel. Additionally, the effect of various fluid properties like thermal conductivity, viscosity, surface tension and contact angle were examined for all nanofluids. Three set of nanofluid samples were prepared using Al2O3, CuO and Fe2O3 with rice bran oil and their various properties are analysed at 0.1% concentration. On comparison among these three nanofluids used, CuO nanofluid exhibited superior behavior followed by Fe2O3 nanofluids while Al2O3 nanofluid was last in the row.
18
Kishore, N., H. N. Vidyasagar, and D. K. Ramesha. "Preparation and Characterization of Transformer Oil Based Nano Fluids." Applied Mechanics and Materials 895 (November 2019): 218–23. http://dx.doi.org/10.4028/www.scientific.net/amm.895.218.
Abstract:
This paper is concerned with the preparation and characterization of transformer oil based nanofluids with the suspensions of Al2O3 and CuO nanoparticles . As a part of experimental study the transformer oil based nanofluids for heat exchangers in transformer cooling application, preparation and characterization has been performed. The preparation of nanofluids is the first key step in experimental studies with nanofluids. One step technique and two step technique are generally used for preparing the nanofluids. This work deals with the preparation methods of (Al2O3-Transformer oil ,CuO-Transformer oil) and characterizing the transformer oil based nanofluids of different volume concentrations (0.05%, 0.1%, 0. 5%, 1.0% and 1.5%).From the results it is revealed that increasing the volume concentration resulted in increase in thermal conductivity, viscosity of the nanofluid and decrease in density and specific heat of nanofluid.
19
Hussain, M., Jin-Hee Kim, and Jun-Tae Kim. "Nanofluid-Powered Dual-Fluid Photovoltaic/Thermal (PV/T) System: Comparative Numerical Study." Energies 12, no. 5 (February 26, 2019): 775. http://dx.doi.org/10.3390/en12050775.
Abstract:
A limited number of studies have examined the effect of dual-fluid heat exchangers used for the cooling of photovoltaic (PV) cells. The current study suggests an explicit dynamic model for a dual-fluid photovoltaic/thermal (PV/T) system that uses nanofluid and air simultaneously. Mathematical modeling and a CFD simulation were performed using MATLAB® and ANSYS FLUENT® software, respectively. An experimental validation of the numerical models was performed using the results from the published study. Additionally, to identify the optimal nanofluid type for the PV/T collector, metal oxide nanoparticles (CuO, Al2O3, and SiO2) with different concentrations were dispersed in the base fluid (water). The results revealed that the CuO nanofluid showed the highest thermal conductivity and the best thermal stability compared to the other two nanofluids evaluated herein. Furthermore, the influence of CuO nanofluid in combination with air on the heat transfer enhancement is investigated under different flow regions such as laminar, transition, and turbulent. Using a CuO nanofluid plus air and water plus air the total equivalent efficiency was found to be 90.3% and 79.8%, respectively. It is worth noting that the proposed models could efficiently simulate both single and dual-fluid PV/T systems even under periods of fluctuating irradiance.
20
Benhadda, Yamina, Mokhtaria Derkaoui, Hayet Kharbouch, Azzeddine Hamid, and Pierre Spiteri. "Numerical Simulation for Cooling of Integrated Toroidal Octagonal Inductor Using Nanofluid in a Microchannel Heat Sink." Metallurgical and Materials Engineering 30, no. 1 (December 11, 2023): 17–44. http://dx.doi.org/10.56801/mme1029.
Abstract:
This paper presents a comprehensive numerical simulation study focused on the cooling of integrated toroidal octagonal inductor using nanofluids within a microchannel heat sink. The investigation utilizes COMSOL Multiphysics 6.0 integrated with the Fluid Flow and Conjugate Heat Transfer Module. The primary objective is to explore and understand fluid flow and heat transfer characteristics within the integrated inductor. The study involves testing three distinct fluids, water, CuO-water nanofluid, and Al2O3-water nanofluid, under laminar flow conditions within microchannels. The choice of fluid plays a significant role in heat transfer, interacting with the microchannel geometry to optimize performance. Three-dimensional computational fluid dynamics (CFD) models are meticulously developed; focusing on toroidal inductors equipped with micro pin fins heat sinks. The study commences by detailing the geometry of the micro coil and the integrated heat sink. The simulation encompasses a mathematical model that captures the intricate interplay between the governing Navier-Stokes equations for fluid dynamics and the heat transfer equations within the integrated inductor. As φ increases, temperature, viscosity, and pressure decrease. CuO-water and Al2O3-water nanofluids play a significant role in influencing laminar flow and key thermal parameters in the toroidal inductor. These nanofluids, which consist of base fluids (water) with dispersed nanoparticles (CuO or Al2O3), are employed as cooling agents to enhance heat transfer. The presence of nanoparticles in the fluid alters its thermal properties, leading to changes in the flow dynamics and overall heat dissipation within the toroidal inductor.The laminar flow characteristics are affected by the nanofluid's viscosity, density, and thermal conductivity. Additionally, the Nusselt number, Reynolds number, and thermal resistance are key thermal parameters that reflect the performance of the cooling system. The nanofluid's influence on these parameters is crucial for understanding and optimizing the thermal management of the integrated toroidal inductor. The enhancement of heat dissipation in the toroidal inductor is achieved through improved thermal properties of the nanofluid. Higher nanoparticle concentrations result in better heat transfer rates, leading to lower temperatures in the toroidal inductor. This, in turn, improves the overall efficiency and performance of the cooling system. The viscosity of the nanofluid is influenced by the presence of nanoparticles. The pressure within the microchannels is also affected by the nanoparticle concentration. An increase in φ can lead to changes in pressure drop along the microchannels. Understanding these variations is crucial for designing an effective cooling system.
21
Imène Saad, Samah Maalej, and Mohamed Chaker Zaghdoudi. "Investigation of the Thermal Performance of a Nanofluid-filled Grooved Cylindrical Heat Pipe for Electronics Cooling." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 99, no. 2 (November 11, 2022): 135–54. http://dx.doi.org/10.37934/arfmts.99.2.135154.
Abstract:
Thermal management of electric and electronic components is a critical issue and needs to consider enhanced cooling systems such as heat pipes. This study deals with the theoretical modeling of a nanofluid-filled copper cylindrical heat pipe for electronics cooling applications. The heat pipe includes helicoidal and trapezoidal capillary grooves. The model can predict the capillary limit as well as the heat transfer in the different sections of the heat pipe. The thermal resistances of the evaporation and condensation sections are calculated based on correlations for heat transfer, which are determined from experiments. Two working nanofluids are considered: water/CuO and water/Al2O3. The thermal performances are predicted for different concentrations and heat sink temperatures, and the heat pipe is positioned horizontally. For both nanofluids, the results indicate that augmenting the concentration of the nanoparticles leads to a capillary limit increase reaching up to 14 % and 25 % for water/Al2O3 and water/CuO, respectively, and an overall thermal resistance decrease reaching up to 51 % and 68 % for water/Al2O3 and water/CuO. Moreover, decreases up to 24 %, and up to 18 % in the evaporator wall temperatures are obtained for water/CuO and water/Al2O3 nanofluids, respectively. The nanofluid water/CuO gives the best thermal performance whatever the nanoparticle concentration and heat sink temperature.
22
Srinivas, T., and A. Venu Vinod. "Effect of Water-Based Nanofluids on the Generation of Entropy in a Shell and Helical Coil Heat Exchanger." Journal of Nanofluids 12, no. 8 (December 1, 2023): 2218–27. http://dx.doi.org/10.1166/jon.2023.2073.
Abstract:
A forced convection finding proves that entropy was generated as a result of the heat transfer between the fluids on the coil and the fluids on the shell side. It was found that entropy generation was affected by nanofluid concentration, coil-side fluid flow rate, shell-side fluid temperature, and agitator speed (500 rpm, 1000 rpm, and 1500 rpm) in this paper. The nanoparticle (Al2O3, CuO, and TiO2) weight fractions ranged from 0.3 to 2%. This paper investigates the friction entropy generation rate, the entropy generation ratio, and the thermal entropy generation rate of various nanofluids in laminar and turbulent flow conditions, using existing correlations to guide the investigation. The results revealed that the generation of entropy increased as the Dean number, SS, and fluid temperature on the shell side of the reactor were increased in the laboratory. And, found that the maximum entropy generation rate of Al2O3/water, CuO/water, and TiO2/water nanofluids occurred at 56.4 percent by weight of the nanofluid, 62.1 percent by weight of the nanofluid, and 48.1 percent by weight of the nanofluid.
23
Shareef, Abbas Sahi, and Zahraa Basim Abdel-Mohsen. "The Effect of using different Nano fluids on Heat Transfers through Flat Plate Solar Collector." Wasit Journal of Engineering Sciences 6, no. 2 (August 30, 2018): 46–55. http://dx.doi.org/10.31185/ejuow.vol6.iss2.91.
Abstract:
In this paper investigation experimentally the effect of CuO-water and Al2O3/water nanofluids on heat transfer in flat plate solar collector. The volume fraction was used (0.125,0.25 and 0.5) % for flow flow rate of working fluid equal to (1 L/min) and the particles size was 20 nm. The experiments are conducted in Kerbala, Iraq with the latitude of 32.60 N. The result shows that the maximum outlet-inlet temperatures difference obtained at (0.5 vol. %) nanofluid are (16.2 0C) for (Al2O3/water), (15.5 0C) for (CuO/water) nanofluid, and (10.2 0C) for pure water. Also, Al2O3 shows high heat transfer compared to CuO, this lead to improve the performance of the solar fat-plate collector.
24
Shirole, Ashutosh, Mahesh Wagh, and Vivek Kulkarni. "Thermal Performance Comparison of Parabolic Trough Collector (PTC) Using Various Nanofluids." International Journal of Renewable Energy Development 10, no. 4 (June 27, 2021): 875–89. http://dx.doi.org/10.14710/ijred.2021.33801.
Abstract:
The objective of this paper is to investigate the theoretical performance of Parabolic Trough Collector (PTC) using various nanofluids. The theoretical performances are calculated for Al2O3, graphite, magnetite, SWCNH, CuO, SiO2, MWCNT, TiO2, Fe2O3, and ZnO in water nanofluids. The heat transfer equations, thermodynamic properties of nanofluid and pumping power are utilised for the development of novel thermal model. The theoretical thermal efficiency of the PTC is calculated, and the economic viability of the technology is predicted for a range of nanofluid concentration. The results showed that the thermal conductivity increases with the concentration of nanoparticles in the base fluid. Magnetite nanofluid showed the highest thermal efficiency, followed by CuO, MWCNT, ZnO, SWCNH, TiO2, Fe2O3, Al2O3, graphite, and SiO2, respectively. The study reveals that MWCNT at 0.4% concentration is the best-suited nanofluid considering thermal gain and pumping power. Most of the nanofluids achieved optimum efficiency at 0.4% concentration. The influence of mass flow rate on thermal efficiency is evaluated. When the mass flow rate increased from 70 Kg/hr to 90Kg/hr, a 10%-20% efficiency increase is observed. Dispersing nanofluids reduces the levelized cost of energy of large-scale power plants. These findings add to the knowledge of the scientific community aimed explicitly at solar thermal energy technology. The report can also be used as a base to pursue solar thermal projects on an economic basis.
25
Kilic, Mustafa, and Hafiz Ali. "Numerical investigation of combined effect of nanofluids and multiple impinging jets on heat transfer." Thermal Science 23, no. 5 Part B (2019): 3165–73. http://dx.doi.org/10.2298/tsci171204094k.
Abstract:
The present study is focused on numerical investigation of heat enhancement and fluid-flow from a heated surface by using nanofluids with three impinging jets. Effects of different volume ratio, different heat flux and different types of nanofluids (CuO-water, Al2O3-water, Cu-water, TiO-water, and pure water) on heat transfer and fluid-flow were studied numerically. The CuO-water nanofluid was used as a coolant in the other parameter. Three impinging jets were used to cool the surface. Low Reynolds number k-? turbulent model of PHONEICS CFD code was used for numerical analysis. It is obtained that increasing volume ratio from ?=2% to 8% causes an increase of 10.4% on average Nusselt number. Increasing heat flux six times has not a significant effect on average Nusselt number. Using Cu-water nanofluid causes an increase of 2.2%, 5.1%, 4.6%, and 9.6% on average Nusselt number with respect to CuO-water, TiO-water, Al2O3-water, and pure water.
26
Ghosh, M. M., S. Ghosh, and S. K. Pabi. "A Parameter for Selection of Nano-Dispersoids in Nanofluids for Thermal Applications." Materials Science Forum 736 (December 2012): 223–28. http://dx.doi.org/10.4028/www.scientific.net/msf.736.223.
Abstract:
A model reported by the present investigators has earlier shown that the extent of heat pick up by a nanoparticle during its collision with the heat source in a given nanofluid would depend on the thermal conductivity (kp, unit W/m.K), density (ρ, unit kg/m3), elastic modulus (E, unit GPa) and Poissons ratio (μ) of the nanoparticle and heat source. Considering the expression for collision period and thermal conductivity of nanoparticle, a factor χ =kp(ρ/E)0.4 is proposed here and examined for the preliminary identification of the potential of a dispersoid in enhancing the thermal conductivity of a nanofluid. The χ-factor for Ag, Cu, CuO, Al2O3 and SiO2 are 2960, 2247, 116, 14.1 and 5.5, respectively. The higher χ-factor of CuO compared to that of Al2O3 can explain why water and ethylene glycol (EG) based CuO-nanofluid is reported to show higher enhancement in the thermal conductivity, when compared to similar Al2O3-nanofluid. The χ for SiO2 is much smaller than that for Ag, which also corroborates well with the marginal enhancement in thermal conductivity of water based nanofluid containing SiO2 nanoparticles. Therefore, a high value of χ of the nanodispersoid can serve as a parameter for the design of nanofluids for heat transfer applications.
27
Jain, Ayush, Imbesat Hassan Rizvi, Subrata Kumar Ghosh, and P. S. Mukherjee. "Analysis of nanofluids as a means of thermal conductivity enhancement in heavy machineries." Industrial Lubrication and Tribology 66, no. 2 (March 4, 2014): 238–43. http://dx.doi.org/10.1108/ilt-03-2012-0024.
Abstract:
Purpose – Nanofluids exhibit enhanced heat transfer characteristics and are expected to be the future heat transfer fluids particularly the lubricants and transmission fluids used in heavy machinery. For studying the heat transfer behaviour of the nanofluids, precise values of their thermal conductivity are required. For predicting the correct value of thermal conductivity of a nanofluid, mathematical models are necessary. In this paper, the effective thermal conductivity of various nanofluids has been reported by using both experimental and mathematical modelling. The paper aims to discuss these issues. Design/methodology/approach – Hamilton and Crosser equation was used for predicting the thermal conductivities of nanofluids, and the obtained values were compared with the experimental findings. Nanofluid studied in this paper are Al2O3 in base fluid water, Al2O3 in base fluid ethylene glycol, CuO in base fluid water, CuO in base fluid ethylene glycol, TiO2 in base fluid ethylene glycol. In addition, studies have been made on nanofluids with CuO and Al2O3 in base fluid SAE 30 particularly for heavy machinery applications. Findings – The study shows that increase in thermal conductivity of the nanofluid with particle concentration is in good agreement with that predicted by Hamilton and Crosser at typical lower concentrations. Research limitations/implications – It has been observed that deviation between experimental and theoretical results increases as the volume concentration of nanoparticles increases. Therefore, the mathematical model cannot be used for predicting thermal conductivity at high concentration values. Originality/value – Studies on nanoparticles with a standard mineral oil as base fluid have not been considered extensively as per the previous literatures available.
28
Gobane, Seboka, Tesfaye Dama, Nasim Hasan, and Ekrem Yanmaz. "Characterization of Copper Oxide–Jatropha Oil Nanofluid as a Secondary Refrigerant." Journal of Nanomaterials 2023 (April 19, 2023): 1–7. http://dx.doi.org/10.1155/2023/7612959.
Abstract:
Nanofluid is a new fluid with special characteristics that can be used in various industrial heat transfer applications. The nanofluid was created using the two-step approach of dispersing nanoparticles into Jatropha oil. The experiments were conducted for four samples of mixture nanofluid at four different volume concentrations of 0.5%, 1.0%, 1.5%, and 2%. The nanoparticles were characterized by X-ray diffractometric analysis, X-ray fluorescence spectroscopy, and scanning electron microscopy. The greatest increase in thermal conductivity for CuO–Jatropha oil nanofluids was made possible by 0.5%, 1.0%, 1.5%, and 2% mixture was 4.5%, 6.01%, 7.6, and 9.1%. The study observed that a mixture achieved the highest thermal conductivity for nanofluid at 2%. At a mixture of 0.5%, the lowest value of thermal conductivity within the range under consideration, a “deeding” effect was seen. To determine the thermal conductivity of CuO–Jatropha oil nanofluids based on temperature, volume concentration, and nanoparticle mixture volume concentrations, the study suggested and compared four sample models. The effect of nanoparticles on the rise of thermal conductivity and viscosity was investigated at temperatures ranging from 298 to 323 K. The X-ray diffractometer is used to characterize nanoparticles. Viscosity and thermal conductivity have been tested in the lab. The findings show that the copper oxide nanoparticles improved the base fluid’s thermophysical abilities more than Jatropha oil alone. For the evaluation of the thermal conductivity and viscosity of nanofluid, new empirical correlations were presented based on experimental data. The thermal conductivity of the nanofluids increases as the temperature rises, while the viscosity of the nanofluids decreases.
29
Nadhum H. Safir, Zuradzman Mohamad Razlan, Shahriman Abu Bakar, Muhammmad Hussein Akbar Ali, Mohd Zulkifly Abdullah, Girrimuniswar Ramasamy, and Rodhiyathul Ahyaa Akbar Ali. "Enhancing Closed System Efficiency through CuO Nanofluids: Investigating Thermophysical Properties and Heat Transfer Performance." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 117, no. 1 (May 17, 2024): 179–88. http://dx.doi.org/10.37934/arfmts.117.1.179188.
Abstract:
Working fluids play a crucial role in closed systems to ensure efficient performance, particularly in systems for heating, cooling, or power generation, where the heat transfer coefficient is pivotal. This study delves into the thermodynamic properties and stability of copper oxide (CuO) nanofluids as alternative working fluids in closed systems. Investigating colloidal suspensions of CuO nanoparticles, the research aims to enhance heat transfer efficiency. CuO nanoparticles, sized at 40nm and 80nm, were dispersed in base fluids like water, ethylene glycol, and oil sans surfactants. The study, divided into static and dynamic phases, examines key nanofluid properties including viscosity, thermal conductivity, specific heat, and heat transfer rate. Through methodologies such as KD2 Pro for thermal conductivity, rheometer for viscosity, and small heat exchanger for heat transfer rate analysis, the effects of volume concentration, temperature, and nanoparticle size on nanofluid performance were evaluated. Sedimentation analysis employed both quantitative (standard deviation calculations) and qualitative (sediment capture methods) approaches. The findings highlight the superior heat transfer rate of 40nm CuO nanofluid at 0.467% volume concentration which is 9.08 kJ/s, suggesting its potential to optimize system efficiency, particularly in heating, cooling, and power generation applications.
30
Sarkar, Jahar. "Performance improvement of double-tube gas cooler in CO2 refrigeration system using nanofluids." Thermal Science 19, no. 1 (2015): 109–18. http://dx.doi.org/10.2298/tsci120702121s.
Abstract:
The theoretical analyses of the double-tube gas cooler in transcritical carbon dioxide refrigeration cycle have been performed to study the performance improvement of gas cooler as well as CO2 cycle using Al2O3, TiO2, CuO and Cu nanofluids as coolants. Effects of various operating parameters (nanofluid inlet temperature and mass flow rate, CO2 pressure and particle volume fraction) are studied as well. Use of nanofluid as coolant in double-tube gas cooler of CO2 cycle improves the gas cooler effectiveness, cooling capacity and COP without penalty of pumping power. The CO2 cycle yields best performance using Al2O3-H2O as a coolant in double-tube gas cooler followed by TiO2-H2O, CuO-H2O and Cu-H2O. The maximum cooling COP improvement of transcritical CO2 cycle for Al2O3-H2O is 25.4%, whereas that for TiO2-H2O is 23.8%, for CuO-H2O is 20.2% and for Cu-H2O is 16.2% for the given ranges of study. Study shows that the nanofluid may effectively use as coolant in double-tube gas cooler to improve the performance of transcritical CO2 refrigeration cycle.
31
Hong Wei Xian, Rahman Saidur, Nor Azwadi Che Sidik, and Yutaka Asako. "Viscosity of CuO Nanofluid Due to Nanoparticles Size and Concentration." Journal of Advanced Research in Applied Sciences and Engineering Technology 28, no. 1 (September 11, 2022): 161–67. http://dx.doi.org/10.37934/araset.28.1.161167.
Abstract:
Past studies showed that varying nanoparticles size could affect several properties of nanofluids. This could lead to significant change of hydro-thermal performance in various applications. In the present study, the effect of copper oxide (CuO) nanoparticle size on the viscosity of nanofluid was investigated under different working temperature and concentration. Base fluid consists of equal amount of distilled water and ethylene glycol. It was found that the addition of 0.05 vol.% CuO into base fluid caused increment of viscosity by 11.8% and 7.27%. On the other side, particle size effect was found to be insignificant on the viscosity of nanofluids at low concentration of CuO nanoparticles (0.025 vol.%). Lastly, the viscosity measured in the present study was predictable by two correlations proposed in past studies and only slight deviation was observed.
32
Sahin, Bayram, Eyuphan Manay, and Eda Feyza Akyurek. "An Experimental Study on Heat Transfer and Pressure Drop of CuO-Water Nanofluid." Journal of Nanomaterials 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/790839.
Abstract:
Heat transfer and pressure drop characteristics of water based CuO nanofluid inside a horizontal tube were investigated experimentally. The upper limitation of the particle volume fraction with respect to heat transfer performance was also found. CuO-water nanofluids with volume fractions of 0.5%, 1%, 2%, and 4% were prepared by dispersing the CuO nanoparticles with an average diameter of 33 nm into deionised water. Experiments were carried out under the steady-state, constant heat flux, and turbulent flow regime conditions. The variations of the average Nusselt number and the friction factor with the Reynolds number were presented. For all given particle volume concentrations, heat transfer enhancements were calculated. It was concluded that the particle volume concentrations higher than 1% vol. were not appropriate with respect to the heat transfer performance of the CuO-water nanofluid. No heat transfer enhancement was observed at Re = 4.000. The highest heat transfer enhancement was achieved at Re = 16.000 and ф = 0.005.
33
Mountrichas, Periklis, Wendi Zhao, Mehtab Singh Randeva, and Prodip K. Das. "Entropy Generation of CuO-Water Nanofluid in a Cavity with an Intruded Rectangular Fin." Energies 16, no. 2 (January 13, 2023): 912. http://dx.doi.org/10.3390/en16020912.
Abstract:
Entropy generation and heat transfer in cavities have received significant interest due to the ever-increasing demand for enhancing thermal performances in many scientific and engineering fields. In particular, nanofluids are being used increasingly in engineering applications and real-life problems, as they exhibit significantly better thermal properties than basic heat transfer fluids, for example, water, oil, or ethylene glycol. This study investigates the entropy generation and heat transfer of a nanofluid in a confined cavity with a moving top wall and a rectangular fin at the bottom. Here, a macro-homogeneous model based on a previously developed model is employed for investigating the mixed convective flow and heat transfer of CuO-water nanofluid. Various fin geometries, Rayleigh numbers, Reynolds numbers, and nanofluid concentrations have been employed. Present results indicate that the heat transfer rate can be improved, while entropy generation can be minimized using nanofluids instead of conventional heat transfer fluids.
34
M, Baskaran, Vijayakumar KCK, and Bharathiraja Moorthy. "Experimental investigations of Jominy End Quench test using CuO nanofluids." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 10 (January 6, 2017): 4455–64. http://dx.doi.org/10.24297/jac.v12i10.5248.
Abstract:
Nanofluids are the new class of quenching medium with colloidal suspensions of nanoparticles in base fluids, which improves the heat transfer characteristics. The present work has been focused on the quenching effect of mild steel and EN-8 steel with nanoparticles dispersed quenching medium. The different volume concentrations of nanofluids have been prepared by adding CuO nanoparticles with the average diameter of less than 50 nm in distilled water. Three volume concentrations (0.01%, 0.05% and 0.1%) of nanofluids have been prepared. EN8 and mild steel rod have machined as per Jominy end quench standard. The materials are heated up to 900⁰C and the heated specimens are Jominy end quenched by using nanofluid. Heat transfer during the cooling has been recorded by interfacing the LabVIEW software, NI-DAQ kit and thermocouple. Then the hardness values are measured at different points on the work piece to examine the change in hardness of the quenched specimens. The result shows that, 0.05% volume concentration nanofluid exhibits a higher heat transfer rate; consequently the high hardness value has been achieved as compared with other specimens. The same effect has been observed with cooling curve, which was recorded by LabVIEW during the quenching process.
35
Howard, Samuel Sami. "Numerical Modeling Prediction of Thermal Storage during Discharging Phase, PV- Thermal Solar and with Nanofluids." Journal of Technology Innovations in Renewable Energy 10 (March 3, 2021): 1–18. http://dx.doi.org/10.6000/1929-6002.2021.10.01.
Abstract:
This study is intended to present a numerical model that was established after the energy conservation equations coupled with the heat transfer equations to predict the discharge behavior of different phase change materials, paraffin under the effect of different operating conditions such as solar radiation, heat transfer fluid, using nanofluids; AI2O3, CuO, Fe304 and SiO2, at different concentrations, and heat transfer fluid temperatures. Besides, the effect of the aforementioned operating conditions on the thermal storage process using PV-Thermal hybrid system and the thermal energy conversion efficiency is presented and discussed. It has been observed in this study that the nanofluid AI2O3 has the longest discharge duration elapse compared to other nanofluids and water as base heat transfer fluid. The nanofluid Ai2O3 as heat transfer fluid exhibited the longest time compared to other nanofluids and water as base heat transfer fluid. It was also shown that the higher the nanofluid volumetric concentrations, the longer the discharge process duration elapses. The data showed that nanofluid Al2O3 has the highest discharge time at different concentrations compared to the other nanofluids during the three regions solid, mushy, and liquid. The results clearly showed that by adding 5 % Fe304 nanoparticles, the melting time of paraffin could be saved by 16.5% over the water. It is also evident that the higher the heat transfer fluid temperature, the higher the hybrid system efficiency, and nanofluids CuO and SiO2 have the highest hybrid system efficiency compared to other nanofluids and water as heat transfer fluid. Finally, a good agreement has been obtained between the model and experimental data published in the literature.
36
Sudarmadji, Sudarmadji, Bambang Irawan, and Sugeng Hadi Susilo. "The effect of hybrid nanofluid CuO-TiO2 on radiator performance." Eastern-European Journal of Enterprise Technologies 4, no. 5 (118) (August 31, 2022): 21–29. http://dx.doi.org/10.15587/1729-4061.2022.263649.
Abstract:
This study aims to improve the performance of the vehicle's cooling system called the radiator, which is part of increasing energy efficiency. Research has been done to investigate the convective heat transfer of hybrid nanofluid, using CuO and TiO2 nanoparticles and water-ethylene glycol (RC) as base fluids on a radiator. The mass concentration of the hybrid nanoparticles varied from 0.25 %, 0.30 %, and 0.35 %. For the preparation of the hybrid nanofluid through a two-step method, by mixing dry samples of CuO and TiO2 nanoparticles (50:50) and then the mixture of radiator coolant, RC (60 % water and 40 % ethylene glycol). The fluid flow varies from 20 liters per minute to 28 liters per minute. Temperature variations range from 70 °C to 90 °C by using controlled heating. Four thermocouples measure the inlet and outlet hot fluid flow and the airflow before and after the radiator. The experiment showed that the overall heat transfer coefficient increases remarkably with the increase of the hybrid nanoparticle concentration under various flow rate values. The maximum overall heat transfer coefficient increases by about 83 % compared to pure radiator coolant under 0.35 % mass concentration at a flow rate of 22 liters per minute and a temperature of 70 °C. It has also been found that the heat transfer rate is highly dependent on the radiator's mass fraction and flow rate. Increasing the mass concentration shows maximum enhancement in heat transfer rate. Inlet temperature also enhances the heat transfer rate, but its effect is small compared to nanofluid's mass concentration and flow rate. This study reveals that hybrid nanofluids can be suitable as a working fluid, especially in small-scale heat transfer devices.
37
Guangbin, Yu, Gao Dejun, Chen Juhui, Dai Bing, Liu Di, Song Ye, and Chen Xi. "Experimental Research on Heat Transfer Characteristics of CuO Nanofluid in Adiabatic Condition." Journal of Nanomaterials 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3693249.
Abstract:
The laminar convective heat transfer behavior of CuO nanoparticle dispersions in glycol with the average particle sizes (about 70 nm) was investigated experimentally in a flow loop with constant heat flux. To enhance heat exchange under high temperature condition and get the more accurate data, we try to improve the traditional experimental apparatus which is used to test nanofluid heat transfer characteristics. In the experiment five different nanoparticle concentrations (0.25%, 0.50%, 0.80%, 1.20%, and 1.50%) were investigated in a flow loop with constant heat flux. The experimental results show that the heat transfer coefficient of nanofluid becomes higher than that of pure fluid at the same Reynolds number and increased with the increasing of the mass fraction of CuO nanoparticles. Results also indicate that at very low volume concentrations nanofluid has no major impact on heat transfer parameters and the pressure of nanofluids increased by the mass fraction increase.
38
Sami, Samuel. "Analysis of Nanofluids Behavior in Concentrated Solar Power Collectors with Organic Rankine Cycle." Applied System Innovation 2, no. 3 (July 16, 2019): 22. http://dx.doi.org/10.3390/asi2030022.
Abstract:
In this paper, the performance of nanofluids in a Parabolic Trough Concentrating Solar Collector (CSP)-based power generation plant, an Organic Rankine Cycle (ORC), and a Thermal Energy Storage (TES) system is studied. This study is intended to investigate the enhancement effect and characteristics of nanofluids Al2O3, CuO, Fe3O4 and SiO2 in integrated concentrating solar power (CSP) with ORC, and TES under different solar radiations, angles of incidence, and different nanofluid concentrations. The refrigerant mixture used in the ORC loop to enhance the ORC efficiency is an environmentally sound quaternary mixture composed of R134a, R245fa, R125, R236fa. The results showed that the power absorbed, and power collected by the CSP collector and thermal energy stored in the storage tank are enhanced with the increase of the solar radiation. It was also found that the CSP hybrid system efficiency has been enhanced mainly by the increase of the solar radiation and higher nanofluid concentrations over the thermal oil as base fluid. Also, the study concludes that the nanofluid CuO outperforms the other nanofluids—Al2O3, Fe3O4 and SiO2—and has the highest CSP solar collector performance compared to the other nanofluids and thermal oil base fluid under study at similar conditions. Finally, it was found that the model’s prediction compares fairly with data reported in the literature; however, some discrepancies exist between the model’s prediction and the experimental data.
39
Muthiah, CT, C. Arvind, S. Sekar, R. Giri, C. Devanathan, and S. Girisankar. "Analysis of heat transfer characteristics in helically coiled heat exchanger using Al2O3 and CuO nanofluids." Journal of Physics: Conference Series 2054, no. 1 (October 1, 2021): 012026. http://dx.doi.org/10.1088/1742-6596/2054/1/012026.
Abstract:
Abstract Heat exchangers play a vital a role in engineering implementations across various domains of engineering. The advent of nanofluids have enabled and facilitated better modes of heat transfer in heat exchangers. An experimental run is conducted to note the heat transfer characteristics of a helical coil heat exchanger with Aluminium oxide-water, copper oxide-water based nanofluids at three different concentrations (0.1 %,0.2 %,0.3 %). It was observed that there was an increase in heat transfer during the usage of nanofluids when compared to the conventional water being used as a working fluid. The increased heat transfer resulted in an increased effectiveness of heat transfer of the heat exchanger when run with the Aluminium oxide nanofluid and copper oxide nanofluid than water. The heat transfer characteristics of copper oxide nanofluid were more effective and efficient when compared to Aluminium oxide nanofluid. The experimental results were simulated in ANSYS Fluent and the simulated results correlate with the experimental results with minimal deviation (<4%)
40
Sohel, M. R., Saidur Rahman, Mohd Faizul Mohd Sabri, M. M. Elias, and S. S. Khaleduzzaman. "Investigation of Heat Transfer Performances of Nanofluids Flow through a Circular Minichannel Heat Sink for Cooling of Electronics." Advanced Materials Research 832 (November 2013): 166–71. http://dx.doi.org/10.4028/www.scientific.net/amr.832.166.
Abstract:
Nanofluid is the suspension of nanoparticle in a base fluid. In this paper, the heat transfer performances of the nanofluids flow through a circular shaped copper minichannel heat sink are discussed analytically. Al2O3-water, CuO-water, Cu-water and Ag-water nanofluids were used in this analysis to make comparative study of their thermal performances. The hydraulic diameter of the minichannel is 500 μm and total block dimension is 50mm× 50mm× 4mm. The analysis is done at different volume fractions of the nanoparticle ranging from 0.5 vol.% to 4 vol.%. The results showed that the heat transfer performance increases significantly by the increasing of volume fraction of nanoparticle. Ag-water nanofluid shows the highest performance compared to the other nanofluids. So, this nanofluid can be recommended as a coolant flow through a circular minichannel for cooling of electronic heat sink.
41
Mohan, V. Midhun, and A. M. Sajeeb. "Improving the Efficiency of DASC by Adding CeO2/CUO Hybrid Nanoparticles in Water." Advanced Science Letters 24, no. 8 (August 1, 2018): 5651–56. http://dx.doi.org/10.1166/asl.2018.12169.
Abstract:
Solar energy is the abundantly available source of renewable energy with least impact on environment. Direct absorption solar collector (DASC) is the commonly used device to absorb heat directly from sun and make use of it for different heating applications. In the past, many experiments have been done to increase the efficiency of DASC using nanofluids. In this paper, an examination of solar collector efficiency for hybrid CeO2/CuO-water (0.1% by volume) nanofluid under various flow rates and proportions of CeO2/CUO nanoparticles is investigated. The experiments were conducted at flow rates spanning from 20 cc/min to 100 cc/min and with CeO2/CUO nanoparticles proportions of 1:0, 1:0.5, 1:1, 0.5:1, and 0:1. The efficiency increases from 16.5% to 51.6% when the flow rate is increased from 20 cc/min to 100 cc/min for hybrid CeO2/CuO(1:1)-water nanofluid. The results also showed an increase in efficiency of 13.8, 18.1, 24.3, 24.9 and 26.1% with hybrid combination of CeO2/CUO at ratios 1:0, 1:0.5, 1:1, 0.5:1, and 0:1 respectively in comparison with water at a flow rate of 100 cc/min.
42
Zanzote, Megha. "CFD Analysis of Enhancement of Heat Transfer of Automobile Radiator with Hybrid Nanofluid as a Coolant." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (September 30, 2021): 367–76. http://dx.doi.org/10.22214/ijraset.2021.37971.
Abstract:
Abstract: The performance of the radiator depends on the fluid used in it as a coolant. The conventional fluids like water, ethylene glycol used as a coolant have low thermal conductivity and are not enough for transferring the heat to more extend. Nanoparticles because of their high thermal conductivity enhances the performance of the radiator when added into the base fluid. In the present work Al2O3-CuO/ Water based hybrid nanofluid is used as a coolant for the CFD analysis of automobile radiator. Different mixing ratios (80:20, 60:40,50:50,40:60 and 20:80) of Al2O3-CuO nanoparticles are used in water with 1% volume concentration. The inlet temperature and volume flow rate of fluid are kept constant. The nanofluid with 20:80 mixing ratio of Al2O3-CuO gives maximum enhancement in heat transfer coefficient and Nusselt number than water by 72% and 65% respectively. Keywords: Coolant, Heat Transfer Coefficient, Nusselt Number, Hybrid Nanofluids, Radiator
43
Tiwari, Awaneendra Kumar, Kalyan Chatterjee, and Vinay Kumar Deolia. "Application of Copper Oxide Nanofluid and Phase Change Material on the Performance of Hybrid Photovoltaic–Thermal (PVT) System." Processes 11, no. 6 (May 24, 2023): 1602. http://dx.doi.org/10.3390/pr11061602.
Abstract:
The objective of the study is to investigate the thermal, electrical, and exergetic performance of a hybrid photovoltaic–thermal (PVT) system under the influence of copper oxide (CuO) nanofluid and phase change material (Vaseline (petroleum jelly)) as a heat storage medium. A mathematical model was developed with the help of various energy-balance equations over the layers of the hybrid system. The performance evaluation of the PVT system was performed using pure water, CuO-water nanofluid (0.2 and 0.4% weight fractions), and CuO-water nanofluid 0.4% weight fraction with Vaseline as a phase change material. The results of the overall analysis show that the performance of the PVT system is better using CuO-water nanofluid (0.4% wt. fraction) with PCM as compared to the water-cooled PVT system and CuO-water nanofluid. The results obtained from the study show indicate that the cell temperature of PVT was reduced by 4.45% using nanofluid cooling with PCM compared to a water-cooled PVT system. Moreover, the thermal, electrical, and overall efficiencies improved by 6.9%, 4.85%, and 7.24%, respectively, using 0.4% wt. fraction of CuO-water nanofluid with PCM as compared to PVT water-cooled systems. The performance of the PVT system was also investigated by changing the mass flow rate (MFR). The increase in mass flow rate (MFR) from 0.05 kg/s to 0.2 kg/s tends to enhance the electrical and overall efficiencies from 12.89% to 16.32% and 67.67% to 76.34%, respectively, using 0.4% wt. fraction of CuO-PCM as fluid.
44
Hayat, Tanzila, and S. Nadeem. "An improvement in heat transfer for rotating flow of hybrid nanofluid: a numerical study." Canadian Journal of Physics 96, no. 12 (December 2018): 1420–30. http://dx.doi.org/10.1139/cjp-2017-0801.
Abstract:
The present study examines the comparison of heat transfer properties of magnetohydrodynamic (MHD) rotating traditional nanofluid with that of developing hybrid nanofluid. A new kind of standard fluid, “hybrid nanofluid” is used to improve heat transfer in boundary layer flow. Silver (Ag) and copper oxide (CuO) nano-size particles are considered to constitute our desired hybrid nanofluid. The rotation of nanofluid is accomplished about the vertical axis so that “angular velocity”, ω∗, is constant. The system of nonlinear and coupled ordinary differential equations is handled using numerical approach BVP-4C with shooting procedure. From the present research, it is noticed that, even in the presence of magnetic field, the rate of heat transfer of hybrid nanofluid (Ag–CuO/water) is higher than that of ordinary nanofluid (CuO/water). In hybrid nanofluid, the required rate of heat transfer can be accomplished by picking distinctive and suitable nanoparticle extents.
45
Shanmugam, Suresh Kumar, Ajithram Arivendan, Samy Govindan Selvamani, Thangaraju Dheivasigamani, Thirumalai Kumaran Sundaresan, and Saood Ali. "Characterization and Heat Transfer Assessment of CuO-Based Nanofluid Prepared through a Green Synthesis Process." Ceramics 6, no. 4 (September 22, 2023): 1926–36. http://dx.doi.org/10.3390/ceramics6040119.
Abstract:
The manufacturing of copper oxide (CuO) nanoparticles has been accomplished utilizing a green technique that relies on biologically reliable mechanisms. Aqueous solutions of copper nitrate and Ixora Coccinea leaf extract are used in an environmentally safe process for creating CuO nanoparticles. The characterization of the synthesized CuO nanoparticles involves the utilization of techniques such as X-ray diffractometry (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetricanalysis (TGA). CuO nanoparticles are confirmed by XRD and FTIR peak results. When the particles are measured, they range between 93.75 nm and 98.16 nm, respectively. The produced CuO nanoparticles are used to prepare the nanofluid. While conventional water exhibits a 3 °C temperature difference, nanofluid achieves a considerable temperature differenceof 7 °C. As a result, it is clear that the nanofluid performs better at dispersing heat into the environment. The experiment’s overall findings support the possibility of ecologically friendly, green-synthesized CuO nanoparticle-induced nanofluid as an effective heattransfer fluid that can be applied to heattransfer systems.
46
AL Muallim, Basel, Mazlan A. Wahid, Hussein A. Mohammed, Mohammed Kamil, and Daryoush Habibi. "Thermal–Hydraulic Performance in a Microchannel Heat Sink Equipped with Longitudinal Vortex Generators (LVGs) and Nanofluid." Processes 8, no. 2 (February 17, 2020): 231. http://dx.doi.org/10.3390/pr8020231.
Abstract:
In this study, the numerical conjugate heat transfer and hydraulic performance of nanofluids flow in a rectangular microchannel heat sink (RMCHS) with longitudinal vortex generators (LVGs) was investigated at different Reynolds numbers (200–1200). Three-dimensional simulations are performed on a microchannel heated by a constant temperature with five different configurations with different angles of attack for the LVGs under laminar flow conditions. The study uses five different nanofluid combinations of Al2O3 or CuO, containing low volume fractions in the range of 0.5% to 3.0% with various nanoparticle sizes that are dispersed in pure water, PAO (Polyalphaolefin) or ethylene glycol. The results show that for Reynolds number ranging from 100 to 1100, Al2O3–water has the best performance compared with CuO nanofluid with Nusselt number values between 7.67 and 14.7, with an associated increase in Fanning friction factor by values of 0.0219–0.095. For the case of different base fluids, the results show that CuO–PAO has the best performance with Nusselt number values between 9.57 and 15.88, with an associated increase in Fanning friction factor by 0.022–0.096. The overall performance of all configurations of microchannels equipped with LVGs and nanofluid showed higher values than the ones without LVG and water as a working fluid.
47
Mezrakchi, Ruaa Al. "Investigation of various hybrid nanofluids to enhance the performance of a shell and tube heat exchanger." AIMS Energy 12, no. 1 (2024): 235–55. http://dx.doi.org/10.3934/energy.2024011.
Abstract:
<abstract> <p>In this study, we aim to investigate the heat transfer and flow characteristics of diverse hybrid nanofluids (CuO-ZnO-Water, EG-Water, CuO-EG-Water, SiO<sub>2</sub>-EG-Water, and Al<sub>2</sub>O<sub>3</sub>-EG-Water) as coolants across eight discrete inlet velocities in a shell and tube heat exchanger. Various materials (copper, stainless steel, titanium, and carbon steel) have been employed for the tubing to optimize system performance. The impact of Reynolds number concerning hybrid nanofluids on Nusselt number and friction factor was assessed in this research. The results of the numerical simulations are found to agree well with experimental results within an average deviation of 1.8%. The results indicated the superior heat transfer capabilities of the hybrid nanofluid compared to the base fluid across all conditions. The outcomes revealed the superior heat transfer capabilities of the CuO-ZnO-Water hybrid nanofluid under all tested conditions. When employing CuO-ZnO-Water as a coolant, a substantial increase of over 9% in temperature reduction was observed, as opposed to the approximately 6% attained by other hybrid nanofluids at a lower velocity of 0.5 m/s. Notably, higher Reynolds numbers corresponded to increased Nusselt numbers and decreased friction factors. The decline percentage of the friction factor was 43% at Reynolds number ranging between 10,000 to 40,000. We emphasize the imperative need to optimize nanoparticle types for crafting hybrid nanofluids to enhance the performance of industrial heat exchangers and their coolant efficiency. Ultimately, the utilization of hybrid nanofluids in conjunction with shell and tube heat exchanger systems has yielded a notable enhancement in the overall thermal efficiency of these systems.</p> </abstract>
48
Midhun Mohan, V., and A. M. Sajeeb. "Improving the Efficiency of DASC by Adding CeO2/CuO Hybrid Nanoparticles in Water." International Journal of Nanoscience 17, no. 01n02 (October 12, 2017): 1760011. http://dx.doi.org/10.1142/s0219581x17600110.
Abstract:
Solar energy is the abundantly available source of renewable energy with least impact on environment. Direct absorption solar collector (DASC) is the commonly used device to absorb heat directly from sun and make use of it for different heating applications. In the past, many experiments have been done to increase the efficiency of DASC using nanofluids. In this paper, an examination of solar collector efficiency for hybrid CeO2/CuO–water (0.1% by volume) nanofluid under various flow rates and proportions of CeO2/CuO nanoparticles is investigated. The experiments were conducted at flow rates spanning from 20[Formula: see text]cc/min to 100[Formula: see text]cc/min and with CeO2/CuO nanoparticles proportions of 1:0, 1:0.5, 1:1, 0.5:1 and 0:1. The efficiency increases from 16.5% to 51.6% when the flow rate is increased from 20[Formula: see text]cc/min to 100[Formula: see text]cc/min for hybrid CeO2/CuO (1:1)–water nanofluid. The results also showed an increase in efficiency of 13.8%, 18.1%, 24.3%, 24.9% and 26.1% with hybrid combination of CeO2/CuO at ratios 1:0, 1:0.5, 1:1, 0.5:1 and 0:1, respectively, in comparison with water at a flow rate of 100[Formula: see text]cc/min.
49
Li, Dong Dong, Wei Lin Zhao, Zong Ming Liu, and Bao Jie Zhu. "Experimental Investigation of Heat Transfer Enhancement of the Heat Pipe Using CuO-Water Nanofluid." Advanced Materials Research 160-162 (November 2010): 507–12. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.507.
Abstract:
This paper presents an experimental investigation of the heat transfer characteristics of the heat pipe with CuO-water nanofluid. For this purpose, CuO nanoparticles of 30 nm size were dispersed in distilled water to form stable suspension containing 0.1% ~ 2.0% mass concentrations of nanoparticles, and then the heat pipe was produced after CuO-water nanofluid was added in it as the working fluid. Experimental results show that the use of CuO-water nanofluid hold a lower start-up temperature and shorter start-up time for the evaporation section of the heat pipe compared to distilled water. Their heat transfer performance of the evaporation section and condenser section has been improved than that of distilled water. The heat transfer coefficient of nanofluid is higher than that of the base liquid and found to increase by 29.4% and 125.0% for the mass concentration of 0.5% compared with the heat pipe using distilled water while the input power ranging from 15W to 45W. By examining the thermal resistance, it was found that the thermal resistance has been significantly decreased compared with the heat pipe with distilled water. The thermal resistance of heat pipe using CuO-water nanofluid at a mass concentration of 0.5% is 0.36K/W when the input power is 45W, while the thermal resistance of heat pipe using distilled water is 0.80K/W. Further analysis indicates that the heat pipe using CuO-water nanofluid at 1.0% mass concentrations has the best heat transfer performance.
50
Khaleduzzaman, S. S., Saidur Rahman, Jeyraj Selvaraj, I. M. Mahbubul, M. R. Sohel, and I. M. Shahrul. "Nanofluids for Thermal Performance Improvement in Cooling of Electronic Device." Advanced Materials Research 832 (November 2013): 218–23. http://dx.doi.org/10.4028/www.scientific.net/amr.832.218.
Abstract:
Nanofluid is a promising coolant for high-heat dissipation electronics device or system. The effect of nanofluids as thermal performances on a rectangular shape microchannel heat sink (MCHS) is analytically studied. Al2O3, SiC, and CuO nanoparticles dispersing in water were considered for analysis. A steady, laminar, and incompressible flow with constant heat flux was assumed in the channel. Nanofluids with concentrations of 0.5 to 4.0 vol. % were analyzed at two different inlet velocities of 0.5 m/s and 3.0 m/s. The results showed that highest thermal conductivity enhancement was 12.45% by using SiC-water nanofluids. In the case of Al2O3-water and CuO-water nanofluids maximum improvement were 11.98% and 11.36%, respectively for 4.0 vol. % of nanoparticle concentration. Furthermore, nanofluids as a coolant instead of water showed a highest improve of heat flux 8.51% for water-CuO, and 6.44% and 5.60% increase for Al2O3-water and SiC-water, respectively. The maximum pumping power found 0.33 W at 3 m/s and 0.0091 W at 0.5 m/s for the same concentration of 4.0 vol. % for all of these nanofluids.