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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.
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.
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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.
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.
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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.
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.
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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.
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.
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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.
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.
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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.
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.
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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.
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.
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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.
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.
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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 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.
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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 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.
Dissertations / Theses on the topic "CuO nanofluid":
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Hadaoui, Abdellah. "Effets de taille et de concentration sur les propriétés thermiques et rhéologiques des nanofluides." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00769934.
Le travail présenté dans cette thèse porte sur la synthèse et les caractérisations thermiques et rhéologiques d'un nouveau type de nanofluide : le système Cu2O/Glycérol. La caractérisation est faite en fonction de la taille des particules mises en suspension, de la température et de la fraction volumique solide. Ce travail a nécessité la synthèse des nanoparticules et des nanofluides par la méthode de décomposition thermique des précuseurs organométalliques, qui présente un bon rendement en quantité de nanoparticules (17%). Et le montage d'un dispositif de caractérisation thermique utilisant la méthode 3ω. Finalement, nous avons passé à la caractérisation rhéologique et thermique de ces échantillons. Les résultats obtenus avec ce nouveau système sont intéressants, car l'augmentation de la conductivité thermique atteint des valeurs importantes : 120% et 35% respectivement pour des fractions volumiques aussi faibles que 0,625% et 0,078% de nanoparticules de 7 nm de diamètre, sans influence notable sur la viscosité du fluide hôte, permettant une bonne amélioration du bilan énergétique total. Nous avons observé que la concentration et la taille (surface) des nanoparticules sont des paramètres clefs du comportement de la conductivité thermique effective du nanofluide Cu2O/Glycérol. Nos mesures nous ont permis de déduire la prédominance des modifications de la surface des nanoparticules (par fonctionnalisation ou par réaction chimique secondaire) sur le mouvement brownien dans les transferts thermiques nanoparticules/ fluide hôte.
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Yu, Bo-Huai, and 游博淮. "A Study of Cuo Nanofluid and Water on Closed-loop Pulsating Heat pipe." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/54dktt.
碩士 國立臺北科技大學 冷凍空調工程系所 94 Modern microelectronics thermal management is facing considerable challenges in the wake of miniaturizing of components leading to higher demands on net heat flux dissipation. A new heat transfer device (called pulsating heat pipe (PHP)), which can transfer effectively the heat from one of its end to the other end by a pulsating action of the liquid-vapor system, can fit to the above need. Due to the simple design, cost effectiveness and excellent thermal performance may find wide applications (especially using in the electronic cooling). In this project, an experimentally investigation is conducted to explore the thermal performance of PHP. Several closed-loop pulsating heat pipes filled with slug-plug-train two-phase flow field are developed by implementation for the purpose of flow pattern visualization. In addition, the effects of various design parameters, e.g., working fluid (Cuo nanofluid, water, and methanol), filling ratio, input heat flux, and inclined angle on the thermal performance of PHP, are also analyzed.
The experimental results show that (1) The input heat flux will change the flow pattern inside the PHP tube, which can be divided into three periods-oscillating, transitional and stable periods; (2) The PHP heat resistance decreases with increasing heat load; (3) The PHP exhibits the best thermal performance when FR=30% for CuO nanofluid or water, and when FR=50% for methanol; (4) The PHP filling with 1.0 %wt CuO nanofluid presents the better thermal performance compared to other fluid when 30°≦β≦90°. While PHP filling with methanol can start to work at lowest heat load (20W) when β=0°. It should be noted that the CuO particles may precipitate from the nanofluid and stick on inner surface of tubes during PHP operation, which reduces the CuO concentration and changes the heat transport performance of PHP.
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Chen, Xin-Quan, and 陳信銓. "The suspension stability research of an innovation Submerged Arc Nanoparticles Synthesis System for preparing CuO nanofluid." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/nmszen.
碩士 國立臺北科技大學 機電整合研究所 96 Nanofluid has good suspension stability which may guarantee that nanotechnology of unique material characteristics and the application value in the industrial application. The attractive force between the nanoparticles can cause them to aggregate. Therefore, nanoparticles need to be dispersed by different methods in order to stabilize suspension and completely utilize their unique material characteristics. This purpose of this study is to use an innovation Submerged Arc Nanoparticles Synthesis System(SANSS) to prepare the copper oxide nanofluid. This study aims to reform fore tools and parameter such as peak current, breakdown voltage and pulse-duration, to expect that the condition of prepare good suspension stability CuO nanofluid. From experiment results reveal that the reformatory tools prepares good stability suspension. The nanofluid utilize to examine its average particle diameter, size distribution, observe the morphology of the particles, the pH value, Zeta potential, light adsorption value, and the composition. By the way of long time, observing and measuring the correlation of settles time with the variation of characteristic of nanofluid. Finally, to utilize the total interaction energy of DLVO theory, which composes of the van der waals attraction and the electrostatic repulsion energies, is applied to explain the relation of energy barrier with stability. So as to understand and confirm nanofluid which prepare by Submerged Arc Nanoparticles Synthesis System(SANSS) can be stabilized for a period of time longer than six months by the electrostatic mechanism.
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Byrne, Matthew Davidson. "Effects of particle concentration and surfactant use in convective heat transfer of CuO nanofluids in microchannel flow." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3571.
Heat exchange systems used in everything from cars to microelectronics have rapidly advanced in recent years to offer high heat transfer rates in increasingly smaller sizes. However, these systems have become essentially optimized using conventional heat transfer fluids. To test the viability of nanofluids as a new heat transfer fluid, an experimental investigation was designed using a constant pressure drop configuration to drive flow into a heated square microchannel test section. The experimental trials included seven different test fluids tested over varying concentrations and surfactant use. Two identical test sections were used to collect results on heat transfer rates, pressure drop, mass flowrate and pumping power for all fluids. These results show a heat transfer improvement for nanofluids of 8-16% over pure water, with no meaningful increase in pumping power. This result is highly desirable, as it indicates an easily obtainable heat transfer improvement without an associated pumping cost increase. Importantly, the experiment shows the potential viability of nanofluids for heat transfer applications, while acknowledging limitations such as long term nanofluid stability. text
Book chapters on the topic "CuO nanofluid":
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Bhardwaj, Rashmi, and Saureesh Das. "Chaos in Nanofluidic Convection of CuO Nanofluid." In Industrial Mathematics and Complex Systems, 283–93. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3758-0_20.
Bhat, Amir Yousuf, and Adnan Qayoum. "Thermohydraulic Performance of a Photovoltaic Thermal System Using CuO/EG Nanofluid." In Lecture Notes in Mechanical Engineering, 109–24. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-7047-6_8.
Rajput, Nitesh Singh, Sudhanshu Singh, and Shweta Kulshreshtha. "Investigation of Efficiency of Flat Plate Collector Using CuO–H2O Nanofluid." In Lecture Notes in Mechanical Engineering, 285–95. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4018-3_27.
Iqhwan, Mohd Aidil, Ooi Jen Wai, and Prem Gunnasegaran. "Preparation and Characterization of CuO-Au Hybrid Nanofluid with Different Mixing Ratio." In Lecture Notes in Mechanical Engineering, 117–26. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1308-4_10.
Anwar, Zafar, K. K. Guduru, MD Afzal Ali, M. V. Satish Kumar, and R. Venumadhav. "Experimental Investigation of Heat Transfer Rate by CuO Nanofluid with Twisted-Tape Inserts." In Lecture Notes on Multidisciplinary Industrial Engineering, 599–607. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7643-6_49.
Waje, Mangesh Mukund, Thota S. S. Bhaskara Rao, and S. Murugan. "Performance Enhancement and Exergy Analysis of Thermosyphon ETSC with TiO2 + CuO Hybrid Nanofluid." In Lecture Notes in Mechanical Engineering, 53–59. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4489-4_6.
Fuskele, Veeresh, and R. M. Sarviya. "Heat Transfer Enhancement in a Circular Tube Fitted with Twisted Tape Having Continuous Cut Edges Using CuO-Water Nanofluid." In Springer Transactions in Civil and Environmental Engineering, 367–83. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1202-1_32.
Singh, Vinay, and Munish Gupta. "Characterisation and Zeta Potential Measurements of CuO–Water Nanofluids." In Lecture Notes in Mechanical Engineering, 741–47. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6577-5_72.
Chandra Sekhara Reddy, M., and Veeredhi Vasudeva Rao. "Heat Transfer Enhancement in Automobile Radiator Through the Application of CuO Nanofluids." In Intelligent Manufacturing and Energy Sustainability, 757–67. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4443-3_73.
Chang, Ho, Chih Hung Lo, Tsing Tshih Tsung, Y. Y. Cho, D. C. Tien, Liang Chia Chen, and C. H. Thai. "Temperature Effect on the Stability of CuO Nanofluids Based on Measured Particle Distribution." In Key Engineering Materials, 51–56. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-977-6.51.
Israeli, Tomer, T. Agami Reddy, and Young I. Cho. "Investigation on the Use of Nanofluids to Enhance Heat Pipe Performance." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76247.
This paper reports on preliminary experimental results on using nanofluids to enhance the thermal performance of heat pipes. Our experience with preparing copper oxide (CuO) nanofluids is described. Contrary to earlier studies which report infinite shelf life, we found that nanofluid stability lasted for about three weeks only; an issue which merits further study. We have also conducted various experiments to measure the variation of thermal conductivity and surface tension with CuO nanofluid concentration. Actual experiments on nanofluid heat pipes were also performed which indicated an average 12.5% decrease in the overall thermal resistance of the heat pipe using nanofluid of 3% vol concentration. This observed improvement is fairly consistent with our predictions using a simple analytical thermal network model for heat pipe overall resistance and the measured nanofluid conductivity. The results, though encouraging, need more careful and elaborate experimental studies before the evidence can be deemed conclusive.
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Rimbault, Benjamin, Cong Tam Nguyen, and Nicolas Galanis. "Numerical Modelling of Nanofluid Heat Transfer Inside a Microchannel Heat Sink." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73004.
The problem of laminar flow and heat transfer of water-based nanofluids inside a 3D-microchannel heat sink was numerically investigated, considering temperature-dependent fluids properties. Results, obtained for the 250–2000 Reynolds number range, show that an important enhancement of surface convective heat transfer coefficient can be achieved by increasing the particle volume fraction. For given Reynolds number and particle fraction, a highest heat transfer enhancement is obtained using CuO-water nanofluid. However, the use of nanofluids considerably increases the wall friction and consequently the pumping power. The ‘heat transferred to fluid/pumping power’ ratio was calculated for nanofluids. For given Reynolds number and particle volume fraction, such a ratio was found lowest for CuO-water nanofluid, while alumina-water nanofluids provide similar results.
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Singh, Dheerandra, Mahfooz Ahmad, Azharuddin, and Ahmed Sabeeh. "Augmentation of Solar Still Distillate Productivity using Different Concentrations of CuO Nanofluids: An Experimental Approach." In International Conference on Frontiers in Desalination, Energy, Environment and Material Sciences for Sustainable Development & Annual Congress of InDA. AIJR Publisher, 2023. http://dx.doi.org/10.21467/proceedings.161.15.
A device used to convert saline water into freshwater popularly known as solar still (SS). It is not popular in the market due to its low productivity. In this paper, efforts were put to enhance yield of single slope solar still (SSSS) by mixing copper oxide (CuO) nanoparticles having different concentrations into the base water. The performance of SS with and without nanoparticle were compared. Further, convective and evaporative heat transfer coefficients were evaluated. An experimental arrangement having inclination 27º of glass cover & 0.25 m2 basin area is engineered & investigated in environmental situations of Gorakhpur city. It is founded that SS with CuO nanofluid results 56.64% higher productivity as compared to SS without nanofluids. Convective & evaporative heat transfer coefficients for 0.15% CuO concentration were found to be 8.53 and 13.18 W/m2K respectively. SS with CuO gives 41.75 ml/day of distillate whereas without nanofluid it gives 18.1 ml/day. The distilled water obtained for 0.05%, 0.10%, 0.15% and 0.20% concentrations are 39 ml/day, 42 ml/day, 45 ml/day and 41 ml/day respectively. Comparative results show that CuO nanofluid at 0.15% concentration have higher productivity than others.
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Taws, Matthew, Cong Tam Nguyen, Nicolas Galanis, and Iulian Gherasim. "Experimental Investigation of Nanofluid Heat Transfer in a Plate Heat Exchanger." In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58016.
An experimental study was carried out to determine the forced convective heat transfer and hydraulic characteristics of a chevron-type two-channel industrial PHE when used with a nanofluid. The PHE is composed of two fluid passages formed by three corrugated plates, which have a herringbone pattern and the corrugations are of a trapezoidal shape. Heated water is used on the hot side. On the cold side a mixture of 29nm-diameter CuO nanoparticles in suspension in water is forced. Collected data for the nanofluid side covers two particle volume fractions, 2% and 4.65%, and the range of Reynolds number up to 1000. Results have shown that, for a given Reynolds number, CuO-water nanofluid clearly exhibits a higher friction factor compared to that of water. Calculated Nusselt numbers have shown no significant heat transfer enhancement when using the 2% nanofluid. A decrease of heat transfer was even observed with the 4.65% nanofluid. The laminar-turbulent transition was also observed for the nanofluids studied.
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Yamada, Toru, Yutaka Asako, Mohammad Faghri, and Chungpyo Hong. "Simulation of Thermal Conductivity of Nanofluids Using Dissipative Particle Dynamics." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75311.
The effective thermal conductivity of Al2O3/water and CuO/water nanofluids were modeled by numerically solving steady heat flow in one-dimensional channels. This was accomplished by using energy conserving dissipative particle dynamics (DPDe). The effects of the interfacial thermal resistance and the Brownian motion of nanoparticles were incorporated in the model by modifying the conductive interaction parameter in the energy equation. The results were presented in the form of the thermal conductivity of nanofluids as functions of particle volume fraction and temperature, and were compared with the available experimental and analytical results. The present model agreed well with the experimental results for Al2O3/water nanofluid while there were discrepancies between the model and the results for CuO/water nanofluid.
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Amoura, Meriem, Amar Maouassi, and Noureddine Zeraibi. "HEAT TRANSFER ENHANCEMENT USING CuO/WATER NANOFLUID." In Proceedings of CHT-12. ICHMT International Symposium on Advances in Computational Heat Transfer. Connecticut: Begellhouse, 2012. http://dx.doi.org/10.1615/ichmt.2012.cht-12.530.
Fotukian, Seyede Maryam, and Mohsen Nasr Esfahany. "Turbulent Convective Heat Transfer of Very Dilute Nanofluids Inside a Circular Tube." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18440.
Turbulent convective heat transfer and pressure drop of •-Al2O3/water and CuO/Water nanofluid inside a circular tube were experimentally investigated and compared. The nanofluids were very dilute. Results indicated that addition of small amounts of nanoparticles to the base fluid augmented heat transfer. Measurements showed that pressure drop for the dilute nanofluid was much greater than that of the base fluid. Experimental results were compared with existing correlations for nanofluid convective heat transfer coefficient in turbulent regime.
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McCants, Dale A., M. Yakut Ali, and Jamil Khan. "Effective Viscosity Measurement of CuO and ZnO Nanofluids." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18492.
Nanofluid has the promising potential for enhancing the heat transfer performance of conventional fluids. Several experimental and numerical attempts have been made earlier to investigate its important thermo physical properties like thermal conductivity and viscosity. The findings and results are quite disperse instead of reaching a definitive agreement. This paper presents effective viscosity measurements of CuO and ZnO nanofluids experimentally. A Brookfield viscometer model DV-I Prime with a CPE 40 cone has been used to determine the effective viscosity of nanofluids. The measurements have included the effect of volume concentration of nanoparticles and temperature. The experimental results are compared with several experimental and theoretical models available in the existing literature. From the obtained experimental results it can be concluded that the viscosity values of the above mentioned nanofluids has a tendency to increase with increase of nanoparticle concentration and follows a decreasing trend with an increase in temperature. Presented results can be used to define the above mentioned nanofluids within the experimental volume concentration range in CFD software package and hence to predict overall heat transfer performance using these nanofluids.
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Mane, Nikhil S., and Vadiraj Hemadri. "Effect of Surfactants and Nanoparticle Materials on the Stability and Properties of CuO-Water and Fe3O4-Water Nanofluids." In ASME 2020 Heat Transfer Summer Conference collocated with the ASME 2020 Fluids Engineering Division Summer Meeting and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ht2020-9034.
Abstract The arguments in favor of using nanofluids in thermal applications have been increasing substantially for the last few decades. Nanofluids provide improved performance in heat transfer processes in comparison to their base fluids as a result of their superior thermal properties. Even though nanofluids exhibit better thermal properties, their usage has been limited due to their stability issues. The stability of the nanofluid greatly affects its thermal properties over a period of time. The stability and thermal properties of nanofluids can be affected by parameters like surfactants used and their concentrations, and also on the nanomaterial used in the nanofluid. In this study, surfactant material and nanoparticle material are selected as process variables and for each variable two levels are selected. For surfactant material, Sodium Lauryl Sulfate (SLS) and Cetyl Trimethyl Ammonium Bromide (CTAB) are selected. Surfactant concentration ratios are taken as 1:2 for CuO and 1:4 for Fe3O4 material. Four nanofluid samples are prepared with 0.1% weight of nanoparticles and their stability and properties are studied. The feasibility of turbidity as an indicator for stability is also explored in this work. The results show that the zeta potential and hydrodynamic characteristics are largely dependent on the surfactant material. Both surfactants show good stability of nanofluids. In-line with earlier observations, it is also observed that the nanoparticle material has a dominant effect on the thermal conductivity of the nanofluids. Comparing the turbidity of the nanofluids to the zeta potential, it is observed that the turbidity measurement gives first-hand information about the stability of nanofluids and can act as an index for stability. But still, more exploration is necessary for this field so a quantitive relation can be established between turbidity and zeta potential of different nanofluid materials and concentrations.
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Jafarpur, K., M. H. Nowzari, S. M. H. Jayhooni, and A. Abbasi Baharanchi. "Effect of Staggered Configurations on Laminar Forced Convection Heat Transfer From Square Cylinders Inside Water/CuO Nanofluid." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89958.
In the present article, forced convection heat transfer of steady flows pass over staggered square cylinders has been studied numerically. In the tested cases, the passing fluids are nanofluid which has water as base fluid, containing CuO as nanoparticles with different volume fractions. Besides, the flow is laminar and all cylinders are square with constant wall temperature. Recent correlations are used for viscosity and thermal conductivity of nanofluids which are functions of temperature and particle volumetric concentration. Numerical simulations have been performed for low Peclet numbers(Pe ≤ 200), since in this range the flow is steady and laminar. Four different configurations of square cylinders have been studied and the results are compared with each other. This is to investigate the effect of different staggered configurations on forced convection heat transfer inside CuO/Water nanofluids. Finally, a model which has the configuration for the highest heat transfer enhancement inside CuO/Water nanofluids with different particle volume fractions has been specified.
