Topic
Heat transfer
About: Heat transfer is a research topic. Over the lifetime, 181795 publications have been published within this topic receiving 2923586 citations. The topic is also known as: heat exchange.
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TL;DR: In this article, a bibliographical review on the convective heat transfer through microchannels is presented, highlighting the main results obtained on the friction factor, on the laminar-to-turbulent transition and on the Nusselt number in channels having a hydraulic diameter less than 1 mm.
647 citations
TL;DR: The problem of finding the temperature distributions has been solved assuming the well-known laws governing the transfer of heat from a liquid in turbulent motion to a solid and the use of some interesting mathematical functions which are related to theWell-known Bessel Functions.
Abstract: If a liquid, initially at uniform temperature, passes lengthwise through a right, porous prism, initially at some other uniform temperature, the sides of the prism being adiabatic and impervious to the liquid, then the temperatures of both liquid and solid will be functions of the time and of a distance. The problem of finding the temperature distributions has been solved assuming the well-known laws governing the transfer of heat from a liquid in turbulent motion to a solid. The solution as presented involves the use of some interesting mathematical functions which are related to the well-known Bessel Functions. If a gas is used instead of a liquid, the problem is much more complicated, but a dimensional method of treating the problem leads to results which may be very useful in practice. The author wishes to express his thanks and appreciation to Dr. S. Y. Burke for suggesting this research and showing such a stimulating interest during its development, and also to the Combustion Utilities Corporation for permission to publish the results.
645 citations
13 Jun 2004
TL;DR: In this paper, the authors compared the performance of nano-fluids with pure water on a smooth horizontal flat surface (roughness of a few tens nano-meters) and showed that nano-particles have poor heat transfer performance compared to pure water.
Abstract: Abstract Boiling heat transfer characteristics of nano-fluids with nano-particles suspended in water are studied using different volume concentrations of alumina nano-particles. Pool boiling heat transfer coefficients and phenomena of nano-fluids are compared with those of pure water, which are acquired on a smooth horizontal flat surface (roughness of a few tens nano-meters). The experimental results show that these nano-fluids have poor heat transfer performance compared to pure water in natural convection and nucleate boiling. On the other hand, CHF has been enhanced in not only horizontal but also vertical pool boiling. This is related to a change of surface characteristics by the deposition of nano-particles. In addition, comparisons between the heat transfer data and the Rhosenow correlation show that the correlation can potentially predict the performance with an appropriate modified liquid-surface combination factor and changed physical properties of the base liquid.
644 citations
TL;DR: In this article, a new physical quantity E h = 1 2 Q vh T, referred to as entransy, was identified as a basis for optimizing heat transfer processes in terms of the analogy between heat and electrical conduction.
644 citations
TL;DR: In this article, a 1D electrochemical, lumped thermal model is used to explore pulse power limitations and thermal behavior of a 6Ah, 72 cell, 276 V nominal Li-ion hybrid-electric vehicle (HEV) battery pack.
643 citations