Relevant bibliographies by topics / Enhancement of thermo-hydraulic performance

Academic literature on the topic 'Enhancement of thermo-hydraulic performance'

Author: Grafiati
Published: 15 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Journal articles on the topic "Enhancement of thermo-hydraulic performance":

1

Alam, Mir Waqas, and Basma Souayeh. "Parametric CFD Thermal Performance Analysis of Full, Medium, Half and Short Length Dimple Solar Air Tube." Sustainability 13, no. 11 (June 7, 2021): 6462. http://dx.doi.org/10.3390/su13116462.

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In the present decade, research regarding solar thermal air heaters (SAHs) has noticed a continuous progression in thermo-hydraulic performance augmentation approaches. There now exists a wide variety of thermo-hydraulic performance augmentation approaches and researchers have designated various structures. Nevertheless, there seems to be no generalization to any of the approaches employed. The present numerical investigation reports on the thermo-hydraulic characteristics and thermal performance for flow through a varied length (full, medium, half, and short length) dimple solar air heater (SAH) tube. The study highlights recent developments on enhanced tubes to augment heat transfer in SAH. The influence of different length ratio, dimple height ratio (H), and pitch ratio (s) on thermo-hydraulic characteristics have been investigated in the Reynolds number (Re) range from 5000 to 25,000. Air is used as the working fluid. The commercial software ANSYS Fluent is used for simulation. The shear stress transport (SST) model is used as the turbulence model. Thermal energy transport coefficient is increased in the full-length dimple tube (FLDT), compared to the medium-length dimple tube (MLDT), half-length dimple tube (HLDT) and short-length dimple tube (SLDT). Similarly, the pitch ratio (s) has more influence on Nusselt number (Nu) compared to the dimple height ratio (H). The friction factor decreases with an increase in pitch ratio. Nu increases and f decreases with increasing Re for all combinations of H and s. Low s and higher H yields high enhancement of HT and PD. Integration of artificial roughness on the tube increases the values of Nu and f by 5.12 times and 77.23 times for H = 0.07, s = 1.0 at Re value of 5000 and 25,000, respectively, in regard to the plain tube. For all the tested cases, the thermo-hydraulic performances (η) are greater than unity.
2

Kumar, Thakur Sanjay, N. S. Thakur, Anoop Kumar, and Vijay Mittal. "Use of artificial roughness to enhance heat transfer in solar air heaters – a review." Journal of Energy in Southern Africa 21, no. 1 (February 1, 2010): 35–51. http://dx.doi.org/10.17159/2413-3051/2010/v21i1a3248.

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Improvement in the thermo hydraulic performance of a solar air heater can be done by enhancing the heat transfer. In general, heat transfer enhancement techniques are divided into two groups: active and passive techniques. Providing an artificial roughness on a heat transferring surface is an effective passive heat transfer technique to enhance the rate of heat transfer to fluid flow. In this paper, reviews of various artificial roughness elements used as passive heat transfer techniques, in order to improve thermo hydraulic performance of a solar air heater, is done. The objective of this paper is to review various studies, in which different artificial roughness elements are used to enhance the heat transfer rate with little penalty of friction. Correlations developed by various researchers with the help of experimental results for heat transfer and friction factor for solar air heater ducts by taking different roughened surfaces geometries are given in tabular form. These correlations are used to predict the thermo hydraulic performance of solar air heaters having roughened ducts. The objective is to provide a detailed review on heat transfer enhancement by using an artificial roughness technique. This paper will be very helpful for the researchers who are researching new artificial roughness for solar air heater ducts to enhance the heat transfer rate and comparing with artificial roughness already studied by various researchers.
3

Saghir, Mohamad Ziad. "Thermo-Hydraulic Performance of Multiple Channels and Pin Fins Forming Convergent/Divergent Shape." Energies 15, no. 21 (October 27, 2022): 7993. http://dx.doi.org/10.3390/en15217993.

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Heat enhancement has been addressed by studying flow in channels with different shapes. The present paper investigates a particular channel shape with divergent and convergent forms. Two configurations are addressed: wall channels and pin-fin walls forming divergent/convergent shapes. The flow is assumed to be in a laminar and steady-state condition. The numerical model investigated the heat enhancement for different flow rates represented by Reynolds numbers. The average Nusselt number and the performance evaluation criterion revealed that wall channels outperformed the pin-fin shape. The performance evaluation criterion is higher than 1 for the wall channels. The main reason for this is that the flow passes through and above the wall creating mixing. This flow configuration happened since the wall height is shorter than the test cavity height. It is important to emphasize that pin-fins forming convergent channels did not improve heat enhancement when compared to convergent channels. No significant variation in the pressure drop was detected.
4

Singh, Ajeet Pratap, and O. P. Singh. "Thermo-hydraulic performance enhancement of convex-concave natural convection solar air heaters." Solar Energy 183 (May 2019): 146–61. http://dx.doi.org/10.1016/j.solener.2019.03.006.

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Dilip, D., S. Vijay Kumar, M. S. Bobji, and Raghuraman N. Govardhan. "Sustained drag reduction and thermo-hydraulic performance enhancement in textured hydrophobic microchannels." International Journal of Heat and Mass Transfer 119 (April 2018): 551–63. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.11.093.

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Raj, Vijilius Helena, S. Vinod Kumar, Mohammed Hussein, Rahul Kadam, Dinesh Kumar Yadav, and Shekhar Sharma. "Enhancement of Thermo-Hydraulic Performance using Water-Based Alumina Nanofluids: A Numerical Investigation." E3S Web of Conferences 507 (2024): 01074. http://dx.doi.org/10.1051/e3sconf/202450701074.

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This study investigates the heat transfer and fluid flow characteristics of pure water passing through a double tube heat exchanger (DTHX). Computational fluid dynamics (CFD) simulations were conducted using ANSYS-FLUENT 22 R1 software. Mathematical models and thermophysical properties of nanofluids and water from existing literature were employed. The comparison focused on pure water and 1% Al2O3/H2O nanofluids. Various operating variables such as Reynolds number and temperature were considered across the inner and outer tubes. The Reynolds number ranged from 2500 to 5500 at 80°C for the inner tube and 2500 at 15°C for the outer tube. Key findings include a 7.69% increase in friction factor for 1% Al2O3/H2O compared to pure water and a 16% increase compared to the Gnielinski correlation at a Reynolds number of 2500. The Nusselt number (Nu) exhibited a 98.42% increase compared to the Gnielinski correlation at a Reynolds number of 5500 and a 39% increase compared to pure water at the same Reynolds number. Heat transfer coefficients (hi) were found to increase by 9.52% compared to pure water and 12% compared to the correlation in existing literature.
7

Hasan, Ibtisam, Wafa Maki, and Yaser Enaya. "Thermo-hydraulic performance evaluation of heat exchanger tube with vortex generator inserts." Thermal Science 26, no. 2 Part B (2022): 1545–55. http://dx.doi.org/10.2298/tsci210528289h.

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This work is undertaken as a scientific experiment to test a new design of a turbulent generator. The current research experiments the influence of novel vortex generator inserts on heat transfers within a tube under a uniform heat flux. A Cu tube with a 45 mm inner diameter and 1350 mm length is used along with a solid disc injector (swirl generator) that comprises ten crescent holes with equal circumferential distribution angles around the disk canter. Subsequently, a swirl flow is generated by deviating the stream flow 45? causing it to spin in the direction of the axial flow. Flow directors are on 45? angles toward the axial direction for each of the crescent holes. This study is an example of flow degradation. Reynolds numbers range from 6000 to 13500. Therefore, fluid-flow is treated as a turbulent system. All experiments done with air are regarded as a power fluid and Prandtl number is fixed at about 0.71. Thermo-hydraulic performance of heat exchanger is analyzed. The average heat transfer Nusselt number is calculated and discussed. The experiment found out that Nusselt number increases with an increase in Reynolds number as well as the number of swirl generators. At four vortex generators, the maximum augmentation in heat transfer is around 4.3 times greater than the plain tube and friction factor is about 1.28 with 5 vortex generators insets. The results indicate a promising heat exchanger enhancement in the local petroleum industries.
8

Lotfi, Babak, and Bengt Sundén. "Thermo-Hydraulic Performance Enhancement of Finned Elliptical Tube Heat Exchangers by Utilizing Innovative Dimple Turbulators." Heat Transfer Engineering 41, no. 13 (June 27, 2019): 1117–42. http://dx.doi.org/10.1080/01457632.2019.1611132.

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Nguyen Minh and Pham Ba Thao. "Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis." CFD Letters 13, no. 7 (July 25, 2021): 1–12. http://dx.doi.org/10.37934/cfdl.13.7.112.

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Proper determination of inclination angle of a flat tube may increase the overall heat transfer performance without extending heat transfer surface. In this paper, the inclined flat tube heat exchanger with plain fins is numerically investigated. The influence of flat tube inclination angle and Reynolds number on the thermo-hydraulic performance index was evaluated. Tube pitch, fin spacing and flat tube size are fixed. Solving 3D computational domain with the symmetric boundary condition is used to reduce computation time. The results show that when increasing the inclination angle of the flat tube from 0 to 45°, both heat transfer and pressure loss increase because the free area of air flow decreases leading to an increase in air velocity and impingement heat transfer. The variation of inclination angle from 0 to 15°, the increase in heat transfer is stronger than the increase in the pressure loss penalty, so the performance index reaches a maximum of 0.405 at the angle of 15°. Contours of temperature, pressure and velocity at different inclination angles are presented to clarify the thermo-hydraulic characteristics of finned-tube heat exchangers using inclined flat tubes. The current work yields heat transfer enhancement ability by adjusting inclination angle of a heat transfer flat tube.
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Parsazadeh, Mohammad, Farshid Fathinia, Amirhossein Heshmati, Mazlan Abdul Wahid, and Mohsin Mohd Sies. "Numerical Study on Heat Transfer of Turbulent Flow in a Channel with Composite Arrangement Obstacles." Applied Mechanics and Materials 388 (August 2013): 161–68. http://dx.doi.org/10.4028/www.scientific.net/amm.388.161.

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Forced convective heat transfer of turbulent flow in a two-dimensional channel mounted triangular and trapezoidal obstacles in upper wall and bottom wall arranged with periodic grooves is numerically studied. Continuity, momentum and energy equations are discretized with second order upwind method is applied to solve the equations. (RNG) k-ε model is implemented to predict the thermo-hydraulic performance of the flow. A thick of 3mm made up by aluminum is implemented for channel walls that the bottom and upper walls are heated with a uniform heat flux. The thermo-hydraulic effects of shapes and positions of obstacles mounted on upper wall referred to the bottom ribbed and grooved wall of the channel as well as its thermal enhancement factorare tested in a Reynolds number range of 3000 to 5000 with engine oil as working fluid. The numerical results demonstrate that combination of trapezoidal obstacles arrays of the upper wall placed against of ribs array of the bottom wall reveals highest thermal enhancement factor due to trapezoidal obstacles with increasing height in flow direction not only lead the flow to the bottom grooved wall but also the flow osculate surface of the obstacle and restart the thermal boundary layer with lowest friction factor compared to other cases.
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Journal articles

Dissertations / Theses on the topic "Enhancement of thermo-hydraulic performance":

1

Yahiat, Feriel. "Analyse des mécanismes d’intensification du mélange et des transferts thermiques par combinaison de méthodes passives dans des écoulements internes tubulaires : application aux réacteurs chimiques continus et aux capteurs solaires." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2023. http://www.theses.fr/2023MTLD0005.

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L’efficacité énergétique des composants et systèmes thermiques, l’amélioration et le développement de nouvelles technologies sont des enjeux majeurs aujourd’hui. Dans ce contexte général, les travaux de cette thèse s’inscrivent dans une perspective d’amélioration des performances thermiques et de mélange d’échangeurs-réacteurs multifonctionnels qui, plus que jamais, sont des composants clés. Pour atteindre cet objectif, une technique d'intensification passive a été explorée. Elle implique l'application de deux types de macro-déformations pariétales sur les parois d'un tube annulaire en écoulement laminaire. L’étude s’est tout d'abord concentrée sur la caractérisation des écoulements secondaires créés par chacune des déformations appliquées séparément sur l’intensification des transferts. Ensuite, une combinaison de déformations radiales successives et alternées sur la paroi externe, associées à une géométrie engendrant un mouvement de swirl sur la paroi interne a permis d'augmenter significativement le mélange, grâce à l'apparition d'advection chaotique dans l'écoulement. La compréhension des mécanismes physiques mis en jeux s’est appuyée sur une analyse numérique des champs locaux thermiques et hydrauliques, sur l’identification des structures tourbillonnaires, sur les sections de Poincaré, ainsi que sur la détermination des performances thermo-hydrauliques et de mélange au niveau global et local. Une évaluation expérimentale du comportement hydraulique a été aussi effectuée par le biais de la méthode de distribution des temps de séjour, ce qui a permis de valider en partie le modèle numérique choisi dans cette étude. Enfin, la dernière partie de l'étude a été consacrée à l'application des concepts d'intensification étudiés au cas d'un capteur solaire thermique à concentration
The energy efficiency of thermal components and systems, as well as the improvement and development of new technologies, are major challenges today. In this general context, the work of this thesis is aimed at improving the thermal performance and mixing of multifunctional heat exchanger-reactors, which are more than ever key components. To achieve this goal, a passive intensification technique has been explored, involving the application of two types of macro-wall deformations on the walls of a laminar flow annular tube. The study initially focused on characterizing the secondary flows created by each of the deformations applied separately in order to enhance heat transfer.Subsequently, a combination of successive and alternating radial deformations on the outer wall, coupled with a geometry that induces swirl motion on the inner wall, significantly increased mixing by promoting chaotic advection within the flow. The understanding of the underlying physical mechanisms relied on numerical analysis of local thermal and hydraulic fields, identification of vortical structures, Poincaré sections, as well as the determination of thermo-hydraulic and mixing performance at both global and local levels. An experimental evaluation of hydraulic behavior was also conducted using the residence time distribution method, partially validating the chosen numerical model in this study. Finally, the last part of the study was dedicated to the application of the intensification concepts studied to the case of a concentrated solar thermal collector
2

INSANA, ALESSANDRA. "Thermal and structural performance of energy tunnels." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2839836.

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Kou, Hau-Shiang, and 寇皓翔. "The Study of Thermo-Hydraulic Performance for Automobile Radiator with Carbon Nanocapsules Materials Coating." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/9cz6fp.

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碩士
國立高雄應用科技大學
模具工程系碩士班
102
Automobile radiator is the key component in the cooling system of the engine for a car. There are some problems will be caused if the thermo- hydraulic performance overheating such as the parts soften, abrasion, amount of oil consumption and the power decrease. However, how to enhance the thermo-hydraulic performance of automobile radiators is a key problem in the vehicle industry. The methods of enhance the automobile radiator performance such as change the angle of the fin and shape, change the working fluid and coated surface. But the method of the coated surface cannot enhance the thermo-hydraulic performance for automobile radiator. Therefore, the objectives of this study will use carbon nanocapsules material coating to enhance the automobile radiator performance without increase the principle. And also enhance the anti-fouling and the corrosion resistant features of the automobile radiator. This study used carbon nanocapsules material coating to enhance the automobile radiator performance of wave-fin and plate-fin. And use the wind tunnels, thermostatic water bath, data miner and differential pressure gauges to measurement the automobile radiator performance of coated and uncoated carbon nanocapsules material. Finally, investigate the effects of automobile radiator thermo-hydraulic performance in different air-side Reynolds number (Rea=0~6214.2) and water-side Reynolds number (Rew=1222.8~5502.8). The results show that, the averaged heat transfer performances of wave-fin radiator with coating the carbon nanocapsules materials have 8-23% higher than without coating. The averaged heat transfer performances of plate-fin radiator coating the carbon nanocapsules materials have 5-17% higher than without coating. When the air-side flow field is laminar, the plate-fin of automobile radiator without coating which heat transfer performance will higher than wave-fin automobile radiator without coating (increase about 9%). When the air-side flow field is turbulence, the wave-fin of automobile radiator without coating which heat transfer performance will higher than plate-fin of automobile radiator without coating (increase about 12%). When the air-side flow field is laminar, the plate-fin of automobile radiator with coating which heat transfer performance will higher than wave-fin of automobile radiator with coating (increase about 5%). When the air-side flow field is turbulence, the wave-fin of automobile radiator with coating which heat transfer performance will higher than plate-fin of automobile radiator with coating (increase about 16%).
4

Chienyun, Chen, and 陳建昀. "The Optimized Design of the Thermo-Hydraulic Performance for a Plate Fin and Tube Heat Exchanger." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2ak5q9.

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碩士
國立臺北科技大學
能源與冷凍空調工程系碩士班
105
In recent years,the issue of saving energy and carbon reduction has been paid more and more attention. The heat exchanger is based on the heat transfer between the fluids to achieve the purpose of reducing the load. Plate fin-and-tube heat exchagers are widely used in several areas, such as heating, ventilating, air conditioning and refrigeration system. However, the geometries of plate fin and tube heat exchanger influence the flow field characteristics greatly and are the main reason for determining the effectiveness of the heat exchanger. In this study, the heat transfer performance and pressure drop of the air side are simulated by using Computational Fluid Dynamics,CFD. The turbulence model is simulated by k-ω and the simulation results are compared with literature. According to the comparison of results, the reasonable agreement is found between the simulation and experimental data, revealing the accuracy of the CFD simulation. For the purpose of optimizing heat exchanger, this research use Taguchi analysis to find the optimal combination of parameters. The geometrical parameters that affect the performance of the heat exchanger, such as tube arrangement, longitudinal pitch, transverse pitch and fin pitch. The increase in the longitudinal pitch and transverse pitch causes a decrease in the heat transfer and pressure drop performance as the flow becomes less compact. The effect of fin pitch on the heat exchanger shows the opposite performance to that of the longitudinal and transverse pitches. According to the results, the optimal combination of parameters is the in-lined configuration, the longitudinal pitch of 38.1mm, the transverse pitch of 35.4mm, and the fin pitch of 1.53mm.

Book chapters on the topic "Enhancement of thermo-hydraulic performance":

1

Bose, Anirban, and Subhadeep Chakraborty. "Comparison of Thermo-Hydraulic Performance Enhancement of Liquid He-Based Cryogenic Nanofluid Flow in Turbulent Region Through Rectangular Plate Fin Heat Exchangers." In Advances in Thermal Engineering, Manufacturing, and Production Management, 147–55. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2347-9_12.

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Beard, Scott Daniel, Mansour Al Qubeissi, and Bidur Khanal. "Computational Analysis of Hydro-powered Bunyip Pump." In Springer Proceedings in Energy, 61–71. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30960-1_7.

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AbstractWith the emerging energy demand, water shortage in rural areas, electric supply challenges, and urgent needs for net zero technologies, there has been a recent response with alternative Hydro-Powered Pumping (HPP) technology, known as the Bunyip. The recently developed system continues to build commercial success, designed to overcome several limitations associated with the previous technology of Hydraulic Ram Pump (HRP) system, such as capacity, height and water leakage issues. This paper is aimed at providing in-depth investigation into the HPP system and possible further hydraulic enhancement, using CFD parametric analysis. This could provide an insight into the fundamental flow mechanics, operational efficiency, standard capacity, and relative delivery. The investigation comprises an initial manufacture data appraisal of performance for three HPP devices. We paired our analysis with the meticulous application and numerical modelling to gather the parametric dataset, and validate against physical testing data. One key finding was that for a delivery head of 50 m, a 6 L/s supply at 4 m of head, resulted in an efficiency of 12% with respect to the water delivered relative to the volume ‘wasted’ through the discharge. Thus, in order to facilitate some of the distinguishing features for the Bunyip, the efficiency is sacrificed to a value lower than that comparable to an HRP.
3

Aneesh, A. M., Atul Sharma, Atul Srivastava, and Paritosh Chaudhuri. "Thermo-Hydraulic Performance of Zigzag, Wavy, and Serpentine Channel Based PCHEs." In Fluid Mechanics and Fluid Power – Contemporary Research, 507–16. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2743-4_49.

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Mehta, Sumit Kumar, and Sukumar Pati. "Thermo-Hydraulic Performance for an Electronic Cooling System Using Porous Material." In Techno-Societal 2020, 197–204. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69925-3_20.

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Vardon, P., H. R. Thomas, and P. Cleall. "Modeling the Three-Dimensional Hydraulic Performance of a Prototype Repository System within Fractured Crystalline Rock." In Thermo-Hydromechanical and Chemical Coupling in Geomaterials and Applications, 517–24. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118623565.ch53.

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Alam, Tabish, Ashok Kumar, and Nagesh B. Balam. "Thermo-Hydraulic Performance of Solar Air Heater Duct Provided with Conical Protrusion Rib Roughnesses." In Advances in Energy Research, Vol. 2, 159–68. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2662-6_16.

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Sahu, M. K., Kumari Ambe Verma, and K. M. Pandey. "Investigation on Thermo-hydraulic Performance of Channel with Various Shapes of Rib Roughness: A Review." In Lecture Notes in Mechanical Engineering, 901–10. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7711-6_89.

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Singh, J., A. Sharma, and R. Chauhan. "Investigation of Thermo-Hydraulic Performance for Different Arrangements of Ribs in Rectangular Solar Air Channel." In Lecture Notes in Mechanical Engineering, 521–34. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3497-0_42.

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Yadav, Siddhita, and R. P. Saini. "Comparative Study on the Thermo-Hydraulic Performance of Corrugated and Impinging Jet Solar Air Heater." In Solar Energy: Advancements and Challenges, 97–109. New York: River Publishers, 2023. http://dx.doi.org/10.1201/9781003373902-6.

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Anjineyulu, K., and Dillip Kumar Mohanty. "Thermo-Hydraulic Performance Analysis of a Shell and Tube Heat Exchanger with Different Single Segmental Baffle Configurations." In Lecture Notes in Mechanical Engineering, 335–44. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1929-9_29.

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Conference papers on the topic "Enhancement of thermo-hydraulic performance":

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Borisov, Igor, Artem Khalatov, Sergei Kobzar, and B. Glezer. "Comparison of Thermo-Hydraulic Characteristics for Two Types of Dimpled Surfaces." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54204.

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Heat transfer and pressure loss data have been obtained for internal flow in confined rectangular channel enhanced with two types of heat transfer augmenters: dimple concavities and combination of dimples on one side with concentrically arranged toroidal banks protruding into the channel on another side. Three different concavity array densities were studied for channel height bulk flow Reynolds numbers based on an equivalent inlet height of a rectangular passage* (foot note) and ranging from 770 to 26,500. Using the average heat transfer coefficient for the fully stabilized region, the overall heat transfer enhancements were compared to baseline smooth channel data. Friction coefficients were also compared to values for a smooth channel. As expected, the surface with banked dimples produces higher heat transfer at the cost of higher friction losses. Initial steps were made to optimize the density of the banked dimple geometry to achieve or exceed heat transfer performance of dimpled surface. Comparison was made for the same depth-to-dimple diameter ratio of 0.2. The results showed that heat transfer enhancements factor in the channel with one side augmented with dimples and another side augmented with banks at the density of 73% can reach 4.3 compared to the enhancement of 3.7 for a high density (67%) double-sided dimpled passage. The corresponding friction factor for studied dimple-bank configuration is reaching 27.0 compared to 2.3 for the dimpled channel. Obtained data indicates that a further improvement in thermo-hydraulic performance of dimpled surfaces is achievable.
2

Tariq, Muhammad Hasnain, Farooq Khan, Hafiz Muhammad Rizwan, and Taqi Ahmad Cheema. "Thermo-Fluid Performance Enhancement Using NACA Aerofoil Cross-Sectional Tubes." In ICAME-22. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/engproc2022023013.

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Smith, Sonya T., Mohsen Mosleh, and Khosro A. Shirvani. "Role of Particle Size to Channel Thickness Ratio on Performance of Nanofluids in Micro-Channels." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66860.

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Experimental and numerical investigations were conducted to explore the viability of single-phase nanofluids for microchannel cooling. The experiments were conducted with water/ethylene glycol-based nanofluids to investigate the thermal conductivity enhancement. In the numerical analysis, micro-channels ranged in width from 40 μm to 90 μm with the fixed channel height were considered. Thermal conductivity enhancements of nearly 14% at particle concentration of 0.1% by weight was observed in the experiments. Numerical predictions suggest that design variables (particle size and channel aspect ratio) and thermo-physical properties of the nanofluid have a significant effect on the thermal performance of micro-channel heat sinks. It was shown that at fixed Reynold number, reduction of channel width reduces the hydraulic pressure loss and the heat transfer coefficient, and utilizing nanofluids increases these parameters.
4

Wang, Lieke, and Bengt Sunden. "THERMAL AND HYDRAULIC PERFORMANCE OF PLATE HEAT EXCHANGERS AS CONDENSERS." In Compact Heat Exchangers and Enhancement Technology for the Process Industries - 2003. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/978-1-56700-195-2.610.

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Skow, Ellen A., Kenneth A. Cunefare, and Alper Erturk. "Design and performance enhancement of hydraulic pressure energy harvesting systems." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Henry Sodano. SPIE, 2013. http://dx.doi.org/10.1117/12.2014263.

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Samal, Sangram Kumar, and Manoj Kumar Moharana. "Numerical Investigation on Thermo-Hydrodynamic Performance of Recharging, Interrupted and Straight Microchannels: A Comparative Study." In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icnmm2018-7725.

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In this study, a three-dimensional numerical investigation on the thermo-hydrodynamic performance of a newly proposed recharging microchannel (RMC) is carried out. In this new design, a straight microchannel separated into more than one small channels and each small channels having individual inlet and outlet. This design enhances the heat transfer and makes the temperature almost uniform across the length of the substrate. The comparison of fluid flow and heat transfer performance between this recharging microchannel (RMC), interrupted microchannel (IMC) and straight microchannel (SMC) with same hydraulic diameter and substrate length were conducted to explore the effect of geometrical configuration on the heat transfer enhancement. The results reveal that for the recharging microchannel, the average Nusselt number increases by 49–122%, while the total pressure drop increases by 15–89%, compared with the interrupted and straight microchannel for the Reynolds number ranging from 100 to 500. From the result, it is also observed that for the investigated Reynolds number range the recharging microchannel having the highest thermal performance compared to interrupted and straight microchannel with a maximum performance factor of 1.80. The outcome of this study indicates possible use of recharging microchannel heat sinks for high heat flux removal applications such as electronic cooling.
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Hassanen, Ahmed M., Samar Akef, and Mohamed A. Swillam. "Performance enhancement of a thermo-photovoltaic (TH-PV) hybrid system using a plasmonic IR absorber." In Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX, edited by Alexandre Freundlich, Masakazu Sugiyama, and Stéphane Collin. SPIE, 2020. http://dx.doi.org/10.1117/12.2543967.

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Prajapati, Anjana N., and Andallib Tariq. "Detailed Heat Transfer Characteristics of Matrix Cooling Channels With Rib Angle 35° Using Liquid Crystal Thermography." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2551.

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Abstract Matrix cooling is relatively newer cooling technique and preferred over the conventional rib turbulators or pin fin cooling due to its capacity to provide the structural rigidity and higher heat transfer enhancement. The present investigation addresses the detailed study of local and averaged heat transfer augmentation distributions within the sub-channels of matrixes with rib angle 35° and varying sub-channels aspect ratios using liquid crystal thermography. The effects of varying sub-channel aspect ratios 1.2, 0.8 and 0.4 on averaged Nusselt number augmentation, friction factor ratio and thermo-hydraulic performance factor have been also verified within the Reynolds numbers range 5800–14000. The flow trend within the sub-channels is typically found to be eccentric and attributed to the possible vortical flow within the sub-channels and this eccentricity reduces as the sub-channel aspect ratio decreases. Results have shown that the highest Nusselt number augmentation and the lowest friction factor ratio are obtained for the highest sub-channel aspect ratio i.e., the best thermo-hydraulic performance factor (≥ 1) has been found for sub-channel aspect ratio 1.2. The sub-channel aspect ratio is found to have significant effect on both Nusselt number augmentation and friction factor ratio as compared to Reynolds number.
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Kerikous, Emeel, and Dominique Thévenin. "Performance Enhancement of a Hydraulic Savonius Turbine by Optimizing Overlap and Gap Ratios." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2670.

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Abstract Due to the significant increase in the human population, satisfying its energy demand becomes a major challenge at present and in the future. Hydropower is a form of renewable energy that converts the potential or kinetic energy of water to useful mechanical power. Considering the low speed of streaming water, hydraulic Savonius turbines can be effectively used for such conditions. Such turbines are robust and very simple to manufacture. However, Savonius turbines suffer from a poor efficiency. For this purpose, an optimization process was done to improve the power density of a hydraulic Savonius turbine while keeping its simple structure. Here in this study, the two main geometry parameters, i.e., 1) the overlap ratio, 2) the gap ratio, are served. Furthermore, the optimal operating range for both parameters is presented. To achieve this goal, many different geometries of the turbine are simulated by using the computational fluid dynamics (CFD) code Star-CCM+. In the optimization process, all simulations are driven by the in-house software OPAL++. The output power coefficient (Cp) is considered as a single target function to be maximized. The performance of the optimal geometry is compared with the standard design over the whole range of operation, leading to an improvement in the performance of the turbine by about 8%.
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Soman, Abhimanyu, Lorenzo Cocchi, Mallikarjuna Peddi, Nikunj Avaiya, Ravindra Devi, and Babu Santhana Gopalakrishnan. "Performance Enhancement Kit for Frame 51 Machine With DLN Combustor." In ASME 2023 Gas Turbine India Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/gtindia2023-118365.

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Abstract A Performance Enhancement Kit (PEK) is introduced to infuse the latest technology to MS5001PA fleet there-by existing customers benefit from increased output, extended inspection intervals, improved reliability, and operability. The kit includes advanced-technology combustion system with improved design of hot gas path (HGP) components. The components in the KIT are designed for either enhanced output of 6% or for an increased interval between repairs or increased ‘Mean Time Between Maintenance’ (MTBM) from 24khrs to 35khrs. Initially PEK was introduced as part of MS5001PA in 2016 for standard combustor. Present study shows its application to Dry Low NOx (DLN) combustion system without affecting Maintenance Interval (MI). PEK DLN configuration alters the combustion and in-turn the Stage 1 Nozzle inlet profile. High fidelity CFD computations were performed to evaluate impact of these altered profile on HGP components, especially the thermal distribution and its impact on durability. Adiabatic wall temperatures obtained from CFD were used in developing heat transfer and flow temperature in the flow path locations. These were used to perform thermo-structural assessment for HGP components using ‘Finite Element Analysis’ (FEA) tools. With this evaluation, durability of HGP components in terms of LCF, creep was thoroughly assessed to ensure part life is meeting MI. Detailed high-fidelity FEA shows that, creep, oxidation, and ‘Low Cycle Fatigue’ (LCF) meet the design requirements for both life extension as well as the power increase conditions with DLN combustor profile. To gain confidence, MS5001PA durability results were benchmarked with field experience of ‘Standard’ (STD) and DLN configuration which shows coherent results with Creep and LCF. This gives confidence in thermal profile which was developed for PEK STD and DLN configurations. Based on detailed thermo-structural assessment, the maintenance factor was set to 1. This paper presents the latest methodology used in CFD for aero flow prediction and high-fidelity Finite Element (FE) assessment used for durability prediction of HGP components.

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