Bibliographies thématiques / Heat transfer enhancement, Homogenization

Littérature scientifique sur le sujet « Heat transfer enhancement, Homogenization »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Heat transfer enhancement, Homogenization"

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Nciri, Rached, Yahya Ali Rothan, Faouzi Nasri et Chaouki Ali. « Fe3O4-Water Nanofluid Free Convection within an Inclined 2D Rectangular Enclosure Heated by Solar Energy Using Finned Absorber Plate ». Applied Sciences 11, no 2 (6 janvier 2021) : 486. http://dx.doi.org/10.3390/app11020486.

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This work investigates a hydrodynamic problem involving the Fe3O4-Water nanofluid. The novelty of this investigation lies in the fact that the nanofluid free convection is evaluated within a specific rectangular enclosure having a finned absorber plate as the top wall, heated by solar energy. The fins below the absorber plate permit to enhance heat transfer towards the nanofluid. A numerical simulation is carried out in order to predict the influence of Rayleigh number, nanofluid layer position, enclosure inclination angle, and absorber plate fins height on the nanofluid flow (in terms of streamlines and velocity magnitude) and heat transfer (in terms of temperature and Nusselt number divided by a certain thermal conductivity ratio). Numerical results show a nanofluid buoyancy enhancement and a temperature distribution homogenization, when the Rayleigh number increases, all the more important and pushed to the right area of the enclosure, as the inclination angle of the enclosure is higher. For relatively low fin heights, the nanofluid buoyancy enhancement is all the more important and pushed to the right area of the enclosure as the inclination angle is high. As the fin height increases, the temperature distribution becomes more homogenous.
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Asianuaba, Ifeoma B. « Heat Transfer Augmentation ». European Journal of Engineering Research and Science 5, no 4 (25 avril 2020) : 475–78. http://dx.doi.org/10.24018/ejers.2020.5.4.1869.

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This article presents a brief review of various methodologies applied for heat transfer enhancement in laminar flow convection regime. Experimental setup for laminar flow convection heat transfer enhancement using insertions has been explained along with the associated results. Nusselt’s number is found to be a key parameter for investigatigation in order to perceive the enhancement in heat transfer. Similarly, the magnetohydrodynamic mixed convection heat transfer enhancement technique has also been explored. The results of isotherms and fluid flow parameters are discussed which directly affect the heat transfer coefficient. This review article complements the literature in related field and thus will be helpful in order to carry out further experiments in heat transfer enhancement in future.
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Asianuaba, Ifeoma B. « Heat Transfer Augmentation ». European Journal of Engineering and Technology Research 5, no 4 (25 avril 2020) : 475–78. http://dx.doi.org/10.24018/ejeng.2020.5.4.1869.

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This article presents a brief review of various methodologies applied for heat transfer enhancement in laminar flow convection regime. Experimental setup for laminar flow convection heat transfer enhancement using insertions has been explained along with the associated results. Nusselt’s number is found to be a key parameter for investigatigation in order to perceive the enhancement in heat transfer. Similarly, the magnetohydrodynamic mixed convection heat transfer enhancement technique has also been explored. The results of isotherms and fluid flow parameters are discussed which directly affect the heat transfer coefficient. This review article complements the literature in related field and thus will be helpful in order to carry out further experiments in heat transfer enhancement in future.
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Gorshenin, A. S., J. I. Rakhimova et N. P. Krasnova. « Conjugated Heat Exchange in Heat Treatment of Aluminum Ingots Simulation ». Journal of Physics : Conference Series 2096, no 1 (1 novembre 2021) : 012053. http://dx.doi.org/10.1088/1742-6596/2096/1/012053.

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Abstract Casting aluminum to obtain semi-finished products - round ingots, due to uneven cooling in the mold, leads to various defects that affect further machining. To eliminate such defects, heat treatment is carried out - homogenization annealing. One of the homogenization important stages is the cooling of the ingots after heating at a rate that does not lead to the ingot quenching. The cooling medium is air. Knowing the conditions of heat exchange between the cooling air and the high-temperature aluminum billet makes it possible to obtain the ingot’s necessary physical and mechanical properties. The article describes the developed mathematical model of conjugate heat transfer during homogenization annealing of aluminum ingot. It allows analytically calculating the temperature of the ingots depending on the cooling time. To verify the data obtained by the mathematical model, the conjugate heat transfer in the ANSYS program was simulated.
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Habibi, Zakaria. « Homogenization of a Conductive-Radiative Heat Transfer Problem ». ESAIM : Proceedings 35 (mars 2012) : 228–33. http://dx.doi.org/10.1051/proc/201235019.

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Kim Hang, Le Nguyen. « Homogenization of Heat Transfer Process in Composite Materials ». Journal of Elliptic and Parabolic Equations 1, no 1 (avril 2015) : 175–88. http://dx.doi.org/10.1007/bf03377374.

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AYUB, ZAHID H. « Ammonia Refrigeration Heat Transfer Enhancement ». Heat Transfer Engineering 25, no 5 (juillet 2004) : 4–5. http://dx.doi.org/10.1080/01457630490443514.

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Ziegler, F., et G. Grossman. « Heat-transfer enhancement by additives ». International Journal of Refrigeration 19, no 5 (juin 1996) : 301–9. http://dx.doi.org/10.1016/s0140-7007(96)00032-1.

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Xuan, Yimin, et Qiang Li. « Heat transfer enhancement of nanofluids ». International Journal of Heat and Fluid Flow 21, no 1 (février 2000) : 58–64. http://dx.doi.org/10.1016/s0142-727x(99)00067-3.

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Hsieh, Shou-Shing, Hao-Hsiang Liu et Yi-Fan Yeh. « Nanofluids spray heat transfer enhancement ». International Journal of Heat and Mass Transfer 94 (mars 2016) : 104–18. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.11.061.

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Thèses sur le sujet "Heat transfer enhancement, Homogenization"

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Webber, Helen. « Compact heat exchanger heat transfer coefficient enhancement ». Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540881.

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Ozerinc, Sezer. « Heat Transfer Enhancement With Nanofluids ». Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611862/index.pdf.

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A nanofluid is the suspension of nanoparticles in a base fluid. Nanofluids are promising for heat transfer enhancement due to their high thermal conductivity. Presently, discrepancy exists in nanofluid thermal conductivity data in the literature, and enhancement mechanisms have not been fully understood yet. In the first part of this study, a literature review of nanofluid thermal conductivity is performed. Experimental studies are discussed through the effects of some parameters such as particle volume fraction, particle size, and temperature on conductivity. Enhancement mechanisms of conductivity are summarized, theoretical models are explained, model predictions are compared with experimental data, and discrepancies are indicated. Nanofluid forced convection research is important for practical application of nanofluids. Recent experiments showed that nanofluid heat transfer enhancement exceeds the associated thermal conductivity enhancement, which might be explained by thermal dispersion, which occurs due to random motion of nanoparticles. In the second part of the study, to examine the validity of a thermal dispersion model, hydrodynamically developed, thermally developing laminar Al2O3/water nanofluid flow inside a circular tube under constant wall temperature and heat flux boundary conditions is analyzed by using finite difference method with Alternating Direction Implicit Scheme. Numerical results are compared with experimental and numerical data in the literature and good agreement is observed especially with experimental data, which indicates the validity of the thermal dispersion model for explaining nanofluid heat transfer. Additionally, a theoretical analysis is performed, which shows that usage of classical correlations for heat transfer analysis of nanofluids is not valid.
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Reddy, M. A. « Single phase heat transfer enhancement ». Thesis, University of Manchester, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616903.

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This thesis presents investigations into the enhancement of heat transfer inside tubes using HiTRAN® tube inserts manufactured by Cal Gavin Ltd. The applicability of heat transfer enhancement in vertical thermo syphon reboilers was investigated using a computer simulation. In vacuum operation, reboilers can have a significant subcooled length (as high as 60 % of the tube length). Heat transfer coefficients in this region are lower than in the two-phase region. Using tube inserts, an increase is made in the heat transfer rate occurring in the sub-cooled region and, a corresponding increase in the length of the tube subjected to two-phase heat transfer and improvement of heat transfer performance results. Geometric variables of the tube insert were investigated experimentally, to study their influence on heat transfer and pressure drop performance. Loop density, loop wire diameter, core wire diameter, loop material and uniformity of loop density were investigated. Two experimental facilities were designed, commissioned and constructed to measure the heat transfer and pressure drop performance of these tube inserts. The new rig at UMIST is located in a flameproof location and was constructed with the intention of investigating a wide range of other processes in the future. Two tube inserts were tested over a Reynolds number range of 200 to 200000 using water as the working fluid. Adiabatic, cooling and heating tests were performed using an inside tube diameter of28.25 mm. At the Cal Gavin Ltd. facility, the rig was redesigned to extend the operating range of data collection. It was enhanced by the provision of automatic data collection, improved accuracy of temperature measurement and new equipment to allow cooling experiments. Tube inserts were tested between a Reynolds number of 100 to 2000 using a viscous oil as the working fluid. Again adiabatic, cooling and heating tests were performed. An inside tube diameter of 21.18 mm was used in the maj ority of the tests, but some preliminary results using a tube diameter of 28.45 mm are also reported. Using the results of the experimental work, pressure drop performance was correlated using an approach similar to that used for packed beds. It was found that 90 % of the data were correlated between ± 15 % of the prediction using specific insert dimensions and inside tube diameter. Further investigations into the prediction of heat transfer coefficients were made. However no general correlation could be developed from a fundamental basis, to predict heat transfer across the full range of Reynolds numbers investigated in this study. A recommendation is made for a suitable correlation. The influence of the insert geometry was associated with the fundamental pressure drop and heat transfer performance of the tube insert, leading to recommendations for the optimisation of tube insert design.
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Wang, Yufei. « Heat exchanger network retrofit through heat transfer enhancement ». Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/heat-exchanger-network-retrofit-through-heat-transfer-enhancement(c504dc06-f261-4968-8c58-4f4de153c694).html.

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Heat exchanger network retrofit plays an important role in energy saving in process industry. Many design methods for the retrofit of heat exchanger networks have been proposed during the last three decades. Conventional retrofit methods rely heavily on topology modifications which often results in a long retrofit duration and high initial costs. Moreover, the addition of extra surface area to the heat exchanger can prove difficult due to topology, safety and downtime constraints. These problems can be avoided through the use of heat transfer enhancement in heat exchanger network retrofit. This thesis develops a heuristic methodology and an optimization methodology to consider heat transfer enhancement in heat exchanger network retrofit. The heuristic methodology is to identify the most appropriate heat exchangers requiring heat transfer enhancements in the heat exchanger network. From analysis in the heuristic roles, some great physical insights are presented. The optimisation method is based on simulated annealing. It has been developed to find the appropriate heat exchangers to be enhanced and to calculate the level of enhancement required. The new methodology allows several possible retrofit strategies using different retrofit methods be determined. Comparison of these retrofit strategies demonstrates that retrofit modification duration and pay-back time are reduced significantly when only heat transfer enhancement is utilised. Heat transfer enhancement may increase pressure drop in a heat exchanger. The fouling performance in a heat exchanger will also be affected when heat transfer enhancement is used. Therefore, the implications of pressure drop and fouling are assessed in the proposed methodology predicated on heat transfer enhancement. Methods to reduce pressure drop and mitigate fouling are developed to promote the application of heat transfer enhancement in heat exchanger network retrofit. In optimization methodology considering fouling, the dynamic nature of fouling is simulated by using temperature intervals. It can predict fouling performance when heat transfer enhancement is considered in the network. Some models for both heat exchanger and heat transfer enhancement are used to predict the pressure drop performance in heat exchanger network retrofit. Reducing pressure by modifying heat exchanger structure is proposed in this thesis. From case study, the pressure drop increased by heat transfer enhancement can be eliminated by modifying heat exchanger structure.
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Lagos, Arcangel. « Heat transfer enhancement in DX evaporators ». Thesis, London South Bank University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311210.

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Staats, Wayne Lawrence. « Active heat transfer enhancement in integrated fan heat sinks ». Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78179.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 205-211).
Modern computer processors require significant cooling to achieve their full performance. The "efficiency" of heat sinks is also becoming more important: cooling of electronics consumes 1% of worldwide electricity use by some estimates. Unfortunately, current cooling technologies often focus on improving heat transfer at the expense of efficiency. The present work focuses on a unique, compact, and efficient air cooled heat sink which addresses these shortcomings. While conventional air cooled heat sinks typically use a separate fan to force air flow over heated fins, the new design incorporates centrifugal fans directly into the body of a loop heat pipe with multiple planar condensers. These "integrated fans" rotate between the planar condensers, in close proximity to the hot surfaces, establishing a radially outward flow of cooling air. The proximity of the rotating impellers to the condenser surfaces results in a marked enhancement in the convective heat transfer coefficient without a large increase in input power. To develop an understanding of the heat transfer in integrated fan heat sinks, a series of experiments was performed to simultaneously characterize the fan performance and average heat transfer coefficients. These characterizations were performed for 15 different impeller profiles with various impeller-to-gap thickness ratios. The local heat transfer coefficient was also measured using a new heated-thin-film infrared thermography technique capable of applying various thermal boundary conditions. The heat transfer was found to be a function of the flow and rotational Reynolds numbers, and the results suggest that turbulent flow structures introduced by the fans govern the transport of thermal energy in the air. The insensitivity of the heat transfer to the impeller profile decouples the fan design from the convection enhancement problem, greatly simplifying the heat sink design process. Based on the experimental results, heat transfer and fan performance correlations were developed (most notably, a two-parameter correlation that predicts the dimensionless heat transfer coefficients across 98% of the experimental work to within 20% relative RMS error). Finally, models were developed to describe the scaling of the heat transfer and mechanical power consumption in multi-fan heat sinks. These models were assessed against experimental results from two prototypes, and suggest that future integrated fan heat sink designs can achieve a 4x reduction in thermal resistance and 3x increase in coefficient of performance compared to current state-of-the-art air cooled heat sinks.
by Wayne L. Staats, Jr.
Ph.D.
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Dellorusso, Paul Robert. « Electrohydrodynamic heat transfer enhancement for a latent heat storage heat exchanger ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0027/MQ31562.pdf.

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Abed, Waleed Mohammed. « Heat transfer enhancement in micro-scale geometries ». Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3004993/.

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Micro-geometries or 'microfluidics' are commonly utilised in a widespread variety of applications such as, bioengineering devices, microelectronic devices, electronics cooling, chemical micro-reactors and mini or micro-heat exchangers. In the microscale systems (with 'small' dimensions typically less than 1 millimeter), however, fluid mixing has been understood as one of the most fundamental and difficult-to-achieve issues because the flow of Newtonian fluids becomes increasingly controlled by viscous forces rather than inertia (as molecular diffusion is dominant at these small scales). As a consequence, the enhancement of convective heat transfer is problematic under these conditions (steady and laminar flow regime). In this thesis, two different regimes of instabilities, namely 'purely-inertial' and 'purely-elastic', have been adopted to enhance the convective heat transfer in the micro-scale geometries. Purely-inertial instability refers here to the secondary flow that arise in curved channels, also known as Dean flows, due to the centrifugal forces and also in crossed channels (cross-slot), symmetry-breaking bifurcations, which results in an axially-oriented spiral vortex along the outlet channels. While, purely-elastic instability is created in the flow of non-Newtonian viscoelastic fluids through curved channels due to the non-linear interaction between elastic stresses generated within the flowing viscoelastic solutions and the streamline curvature or through cross-slot device as a consequence of the planar extensional flow field (strong elongational flow) at the stagnation point. Fluid flow and convective heat transfer characteristics have been investigated experimentally and supporting numerical calculations for Newtonian flow within two different micro-geometries: a square cross-section serpentine microchannel and a square cross-section crossslot micro-device. A group of Newtonian fluids, aqueous glycerine solutions and aqueous sucrose solutions, was utilised to carry out the experiments for purely-inertial flows whilst high-viscosity polymeric viscoelastic fluids, shear-thinning and approximately constant-viscosity Boger solutions, were used for the experiments to investigate purely-elastic instabilities.
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Shi, Haifeng. « Surfactant Drag Reduction and Heat Transfer Enhancement ». The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343664380.

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Stuart, Dale. « Heat Transfer Enhancement using Iron Oxide Nanoparticles ». VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/425.

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Two different iron oxide nanofluids were tested for heat transfer properties in industrial cooling systems. The nanofluids either had 30 nm particles with a wide size distribution to include particles greater than 1 micrometer or 15 nm particles with greater than 95% of the particles less than 33 nm. Calorimetry and thermal circuit modeling indicate that the 15 nm particle ferrofluid enhanced heat capacity. The smaller particle ferrofluid also demonstrated up to a 39% improvement in heat transfer, while the larger particle ferrofluid degraded the heat transfer performance. Particles from the larger particle ferrofluid were noted as settling out of a circulating system and therefore not participating in the bulk fluid properties. Application of 0.32% 15nm particles in an open cooling system improved cooling tower efficiency by 7.7% at a flow rate of 11.4 liter per minute and improved cooling tower efficiency by 3.3% at a flow rate of 22.7 liter per minute, while applying 0.53% 15 nm particles also improved cooling tower efficiency but was less effective than the lower concentration.
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Livres sur le sujet "Heat transfer enhancement, Homogenization"

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Rifert, V. G. Condensation heat transfer enhancement. Southampton : WIT Press, 2004.

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Kakaç, S., A. E. Bergles, F. Mayinger et H. Yüncü, dir. Heat Transfer Enhancement of Heat Exchangers. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9159-1.

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S, Kakaç, dir. Heat transfer enhancement of heat exchangers. Dordrecht : Kluwer Academic Publishers, 1999.

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Saha, Sujoy Kumar, Manvendra Tiwari, Bengt Sundén et Zan Wu. Advances in Heat Transfer Enhancement. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29480-3.

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Saha, Sujoy Kumar, Hrishiraj Ranjan, Madhu Sruthi Emani et Anand Kumar Bharti. Two-Phase Heat Transfer Enhancement. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-20755-7.

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Zanfir, Monica. Heat transfer enhancement in heat exchangers network retrofit. Manchester : UMIST, 1997.

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Song-Jiu, Deng, Hua nan li gong da xue. Research Institute of Chemical Engineering., University of Miami. Clean Energy Research Institute., Zhongguo ke xue yuan. Guangzhou Institute of Energy Conversion. et International Symposium on Heat Transfer Enhancement and Energy Conservation (1988 : South China University of Technology), dir. Heat transfer enhancement and energy conservation. New York : Hemisphere Pub. Corp., 1990.

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Saha, Sujoy Kumar, Hrishiraj Ranjan, Madhu Sruthi Emani et Anand Kumar Bharti. Performance Evaluation Criteria in Heat Transfer Enhancement. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-20758-8.

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Saha, Sujoy Kumar, Hrishiraj Ranjan, Madhu Sruthi Emani et Anand Kumar Bharti. Electric Fields, Additives and Simultaneous Heat and Mass Transfer in Heat Transfer Enhancement. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-20773-1.

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Saha, Sujoy Kumar, Hrishiraj Ranjan, Madhu Sruthi Emani et Anand Kumar Bharti. Heat Transfer Enhancement in Plate and Fin Extended Surfaces. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-20736-6.

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Chapitres de livres sur le sujet "Heat transfer enhancement, Homogenization"

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Han, Je-Chin, et Lesley M. Wright. « Turbulent Flow Heat Transfer Enhancement ». Dans Analytical Heat Transfer, 515–60. 2e éd. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003164487-16.

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Kakaç, Sadik. « Introduction to Heat Transfer Enhancement ». Dans Heat Transfer Enhancement of Heat Exchangers, 1–11. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9159-1_1.

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Manglik, Raj M. « Enhancement of Convective Heat Transfer ». Dans Handbook of Thermal Science and Engineering, 447–77. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-26695-4_14.

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Manglik, Raj M. « Enhancement of Convective Heat Transfer ». Dans Handbook of Thermal Science and Engineering, 1–31. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-32003-8_14-1.

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Bergies, E. Arthur. « The Imperative to Enhance Heat Transfer ». Dans Heat Transfer Enhancement of Heat Exchangers, 13–29. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9159-1_2.

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Saha, Sujoy Kumar, Hrishiraj Ranjan, Madhu Sruthi Emani et Anand Kumar Bharti. « Pool Boiling Enhancement Techniques ». Dans Two-Phase Heat Transfer Enhancement, 5–41. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20755-7_2.

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Saha, Sujoy Kumar, Hrishiraj Ranjan, Madhu Sruthi Emani et Anand Kumar Bharti. « Flow Boiling Enhancement Techniques ». Dans Two-Phase Heat Transfer Enhancement, 43–77. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20755-7_3.

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Onbaşioğlu, S. U., et A. N. Eğrİcan. « Enhancement of Heat Transfer with Horizontal Promoters ». Dans Heat Transfer Enhancement of Heat Exchangers, 433–46. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9159-1_24.

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Wang, Chi-Chuan. « Optimum Design of Air-Cooled Fin-and-Tube Heat Exchangers : Accounting for the Effect of Complex Circuiting ». Dans Heat Transfer Enhancement of Heat Exchangers, 163–84. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9159-1_10.

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Sundén, Bengt. « Flow and Heat Transfer Mechanisms in Plate-and-Frame Heat Exchangers ». Dans Heat Transfer Enhancement of Heat Exchangers, 185–206. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9159-1_11.

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Actes de conférences sur le sujet "Heat transfer enhancement, Homogenization"

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Karami, Mohammad, Mojtaba Jarrahi, Zahra Habibi, Ebrahim Shirani et Hassan Peerhossaini. « Chaotic Heat Transfer in a Laminar Pulsating Flow With Constant Wall Temperature ». Dans ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21358.

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The correlation between heat transfer enhancement and secondary flow structures in laminar flows through a chaotic heat exchanger is discussed. The geometry consists of three bends; the angle between curvature planes of successive bends is 90°. Numerical simulations are performed for both steady and pulsating flows when the walls are subjected to a constant temperature. The temperature profiles and secondary flow patterns at the exit of bends are compared in order to characterize the flow. Simulations are carried out for the Reynolds numbers range 300≤Re≤800, velocity amplitude ratios (the ratio of the peak oscillatory velocity component to the mean flow velocity) 1≤β≤2.5, and wall temperatures 310 ≤ Tw(K) ≤ 360. The results show that in the steady flow, heat transfer enhancement occurs with increasing Reynolds number and wall temperature. However, heating homogenization becomes almost independent of Reynolds number when homoclinic connections exist in the flow. Moreover, at high values of wall temperature, heat transfer enhancement is greater than mixing improvement due to the presence of homoclinic connections. In the pulsating flow, Nusselt number improves with β, and β≥2 is a sufficient condition for heat transfer enhancement. The formation and development of homoclinic connections are correlated with the heating homogenization.
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Le Guer, Yves, et Kamal El Omari. « Thermal Chaotic Mixing in a Two Rod Mixer With Imposed Heat Flux ». Dans ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78044.

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We investigate the mixing and heat transfer enhancement in a two rod mixer for a highly viscous fluid. The mixer is composed of two circular rods maintained vertically in a cylindrical tank. The rods and tank can rotate around their revolution axis. Chaotic flows are obtained by imposing temporal modulations of the rotational wall velocities. The fluid is incompressible, Newtonian and the thermophysical properties, at first approximation, are kept constant with temperature. We study the effect of different stirring protocols and flow configurations leading to chaotic flows on the efficiency of mixing and heat transfer for the particular wall boundary condition of constant heat flux (i.e. Neumann condition). For this purpose we use different statistical indicators as tools to characterize the mean value of fluid temperature and its homogenization. The results show a significant enhancement of heat transfer for the case of an alternated stirring protocol (a result we have already obtained for the constant wall temperature boundary condition [1]).
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El Omari, Kamal, et Yves Le Guer. « Thermal Chaotic Mixing of Non-Newtonian Fluids in a Two Rod Mixer ». Dans ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78043.

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We investigate the mixing and heat transfer enhancement in a two rod mixer for highly viscous non-Newtonian fluids. The mixer is composed of two circular rods maintained vertically in a cylindrical tank. Chaotic flows are obtained by imposing temporal modulations of the rotational velocities of the walls. We study the effect of different stirring protocols leading to non-chaotic and chaotic flows on the efficiency of mixing and heat transfer for three different rheological fluid behaviors: shear-thinning, Newtonian and shear thickening. For this purpose we use statistical indicators characterizing the mean value of fluid temperature and its homogenization. We find that chaotic mixing is suitable for shear-thickening fluids for which we observe a manifest enhancement of the thermal mixing (heat extraction and homogenization). This is due to the increase of apparent fluid viscosity in the vicinity of the rotating walls. This aspect confirms the relevance of chaotic mixing for highly viscous fluids.
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Acharya, Sumanta, et Krishnendu Saha. « HEAT TRANSFER ENHANCEMENT USING GROOVES ». Dans First Thermal and Fluids Engineering Summer Conference. Connecticut : Begellhouse, 2016. http://dx.doi.org/10.1615/tfesc1.hte.012981.

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Rosengarten, Gary, Nicolette Gan et Cameron Stanley. « Heat Transfer Enhancement Using Ferrofluids ». Dans THE 6th NTERNATIONAL CONFERENCE ON FLUID FLOW, HEAT AND MASS TRANSFER. Avestia Publishing, 2019. http://dx.doi.org/10.11159/ffhmt19.152.

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Osakabe, Masahiro, et Sachiyo Horiki. « Heat Transfer of Two-Phase Impinging Jet : Heat Transfer Enhancement ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59482.

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To study the enhancement and degradation mechanism of impinging two-phase heat transfer, air/water two-phase jet was applied on the cooling of copper surface of 30 mm in diameter. The two-phase jet impinged vertically on the horizontal heat transfer surface from capillary nozzle holes of 2, 4 and 6 mm in inner diameter. The non-dimensional heat transfer coefficient (HTC) was defined as the experimental HTC divided with the predictive HTC where the superficial two-phase velocity jG+jL and the physical properties of water were used in the empirical HTC correlation for single-phase flow. The larger non-dimensional HTC and stagnation pressure fluctuation were obtained with the nozzle of larger diameter. The larger nozzle could provide the more significant enhancement of heat transfer and pressure fluctuation with an addition of air. It was considered that the enhancement of heat transfer was due to the stimulation of thermal boundary layer with an addition of air.
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Ozerinc, S., Sadik Kakac et Almila G. Yazicioglu. « HEAT TRANSFER ENHANCEMENT IN LAMINAR CONVECTIVE HEAT TRANSFER WITH NANOFLUIDS ». Dans TMNN-2011. Proceedings of the International Symposium on Thermal and Materials Nanoscience and Nanotechnology - 29 May - 3 June , 2011, Antalya, Turkey. Connecticut : Begellhouse, 2011. http://dx.doi.org/10.1615/ichmt.2011.tmnn-2011.520.

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Rozenfeld, Tomer, Yoram Kozak et G. Ziskind. « Heat Transfer Enhancement in Latent Heat Storage Units ». Dans 11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-2127.

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Sathiyaraj, S., L. Prabhu, Padam Kumar, S. Subash, P. T. Ihjas Ali et M. Abhay. « Enhancement of heat transfer in tubular heat exchanger ». Dans 11TH ANNUAL INTERNATIONAL CONFERENCE (AIC) 2021 : On Sciences and Engineering. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0111048.

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Siginer, Dennis A., et F. Talay Akyildiz. « Heat Transfer Enhancement in Corrugated Pipes ». Dans 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23225.

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The temperature distribution and heat transfer coefficient are investigated in forced convection with Newtonian fluids in pressure gradient driven hydrodynamically and thermally fully developed steady laminar flow in transversally corrugated pipes. The governing equations are solved by means of the epitrochoid conformal mapping and exact analytical solutions are derived for the velocity and temperature fields without viscous dissipation. The effect of the corrugations and the number of waves on the friction factor, the temperature distribution and the heat transfer enhancement is discussed.
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Rapports d'organisations sur le sujet "Heat transfer enhancement, Homogenization"

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Richard J. Goldstein. Heat Transfer Enhancement in Separated and Vortex Flows. Office of Scientific and Technical Information (OSTI), mai 2004. http://dx.doi.org/10.2172/825973.

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Rebello, W. Assessment of heat transfer enhancement and fouling in industrial heat exchangers : Final report. Office of Scientific and Technical Information (OSTI), novembre 1987. http://dx.doi.org/10.2172/6523378.

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Lin, C. X. Heat Transfer Enhancement Through Self-Sustained Oscillating Flow in Microchannels. Fort Belvoir, VA : Defense Technical Information Center, mai 2006. http://dx.doi.org/10.21236/ada460536.

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Jensen, M. K., et B. Shome. Literature survey of heat transfer enhancement techniques in refrigeration applications. Office of Scientific and Technical Information (OSTI), mai 1994. http://dx.doi.org/10.2172/10174019.

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Drost, Kevin, Goran Jovanovic et Brian Paul. Microscale Enhancement of Heat and Mass Transfer for Hydrogen Energy Storage. Office of Scientific and Technical Information (OSTI), septembre 2015. http://dx.doi.org/10.2172/1225296.

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Wang, Evelyn, Yajing Zhao et Samuel Cruz. Capillary-driven Condensation for Heat Transfer Enhancement in Steam Power Plants. Office of Scientific and Technical Information (OSTI), décembre 2021. http://dx.doi.org/10.2172/1837751.

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Kevin Drost, Jim Liburdy, Brian Paul et Richard Peterson. Enhancement of Heat and Mass Transfer in Mechanically Contstrained Ultra Thin Films. Office of Scientific and Technical Information (OSTI), janvier 2005. http://dx.doi.org/10.2172/861948.

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Ohadi, M. M. EHD enhancement of boiling/condensation, heat transfer of alternate refrigerants. Final Report for 1993-1999. Office of Scientific and Technical Information (OSTI), septembre 1999. http://dx.doi.org/10.2172/820038.

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Thiagarajan, S. J., W. Wang, R. Yang, S. Narumanchi et C. King. Enhancement of Heat Transfer with Pool and Spray Impingement Boiling on Microporous and Nanowire Surface Coatings. Office of Scientific and Technical Information (OSTI), septembre 2010. http://dx.doi.org/10.2172/990105.

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Beretta, Gian Paolo, et Pietro Poesio. Microscale Heat Transfer Enhancement using Spinodal Decomposition of Binary Liquid Mixtures : A Collaborative Modeling/Experimental Approach. Fort Belvoir, VA : Defense Technical Information Center, septembre 2013. http://dx.doi.org/10.21236/ada593123.

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