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 thermal model for a Ballard Mark V 35-cell 5 kW PEM fuel cell stack was developed by performing mass and energy balances on the stack, which was coupled with a previously developed electrochemical model linking the power produced by the stack and the stack temperature to the amount and method of heat removal from the surface of the stack.
433 citations
TL;DR: In this paper, the authors made extensive parametric studies of flow and heat transfer of a viscous fluid contained in a square cavity, where flow is generated by the top horizontal boundary wall, which slides in its own plane at constant speed.
432 citations
TL;DR: In this article, aqueous-based nanofluids are formulated in such a way that they are found very stable and are used to investigate their heat transfer behavior under the natural convection conditions.
430 citations
TL;DR: In this article, the authors studied the two-dimensional convective motion in a rectangular cavity, where the two vertical sides of which are maintained at different temperatures were studied for the special case in which the temperature difference ΔT between two vertical walls is so large that the transfer of heat from one vertical wall to the other is achieved almost entirely by convection.
Abstract: This paper studies the two-dimensional convective motion in a rectangular cavity, the two vertical sides of which are maintained at different temperatures. This system is studied for the special case in which the temperature difference ΔT between the two vertical walls is so large that the transfer of heat from one vertical wall to the other is achieved almost entirely by convection. Heat transfer by conduction is assumed to be of importance only in thin boundary layers adjoining the walls. For a cavity of height H, the boundary layers on the two vertical walls are found to have thickness proportional to [ell ], where [ell ]4 = κνH/γgΔT, and the condition for the boundary-layer regime to be established is that [ell ] be small compared with the width of the cavity. An approximate solution of the problem is obtained for the case of large values of the Prandtl number ν/κ, and found to be in satisfactory agreement with experimental results obtained by Elder (1965).
430 citations
TL;DR: In this article, a complete numerical simulation of a growing and departing bubble on a horizontal surface has been performed, where a finite difference scheme is used to solve the equations governing conservation of mass, momentum, and energy in the vapor-liquid layers.
Abstract: In this study, a complete numerical simulation of a growing and departing bubble on a horizontal surface has been performed. A finite difference scheme is used to solve the equations governing conservation of mass, momentum, and energy in the vapor-liquid layers. The vapor-liquid interface is captured by a level set method which is modified to include the influence of phase change at the liquid-vapor interphase. The disjoining pressure effect is included in the numerical analysis to account for heat transfer through the liquid microlayer. From the numerical simulation, the location where the vapor-liquid interface contacts the wall is observed to expand and then retract as the bubble grows and departs. The effect of static contact angle and wall superheat on bubble dynamics has been quantified. The bubble growth predicted from numerical analysis has been found to compare well with the experimental data reported in the literature and that obtained in this work
430 citations