Analysis of Energy and Exergy for Mixed Convection Flow in Microstructure Filled Vented Enclosures
01 Jan 2011-pp 531-539
TL;DR: In this paper, the authors developed a design of experiment to carry out a numerical analysis of heat transfer in a rectangular enclosure filled with a saturated porous medium, and the optimum heat transfer rate was obtained for various configuration-related parameters.
Abstract: Understanding heat transfer through saturated porous media is of great importance to many engineering and geophysical systems such as cooling the electronic devices and solar power collectors, and post-accidental heat removal in nuclear reactors. Large numbers of research studies have been and are conducted on the expanding field of porous media due to the high rate of heat transfer in these systems. Despite the efforts made towards the study of the mechanics of fluid flow through porous media, little is studied the rate of exergy which is the only factor presenting the rate of reusable energy potentially produced by a heat generating body. The objective of this study is to develop a design of experiment to carry out a numerical analysis of heat transfer in a rectangular enclosure filled with a saturated porous medium. The optimum heat transfer rate will be obtained for various configuration-related parameters, namely different inlet to outlet ratios and different inlet width to cavity width ratios. These parameters will be optimized to achieve maximum rate of heat transfer and minimum rate of entropy generation. The results of this study will also help to determine relationships for predicting the heat transfer characteristics of the enclosure.Copyright © 2011 by ASME
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TL;DR: In this paper, the authors analyzed the effect of the motion of horizontal and vertical walls on the entropy generation and heat transfer in a porous square cavity during mixed convection, and the results were presented using streamfunction (ψ), local entropy generation due to fluid friction, isotherms (θ), and local entropy generated due to heat-transfer contours.
Abstract: The aim of the present investigation is to analyze the effect of the motion of horizontal (cases 1a–1d) and vertical walls (case 2a–2c) on the entropy generation and heat transfer in a porous square cavity during mixed convection. The cavity is subject to the thermal boundary conditions such as the hot bottom wall, cold side walls, and thermally insulated top wall. Analysis has been done for various fluids with Prandtl number, Prm = 0.026–7.2, Grashof number, Gr = 105, Reynolds number, Re = 10–100, and Darcy number, Dam = 10−4–10−2. Numerical results are presented using streamfunction (ψ), local entropy generation due to fluid friction (Sψ), isotherms (θ), and local entropy generation due to heat-transfer (Sθ) contours. In addition, the total entropy generation (Stotal), average Bejan number (Beav), and overall heat-transfer rate at the hot bottom wall are analyzed and discussed.
6 citations
Cites background from "Analysis of Energy and Exergy for M..."
...[33] studied the heat transfer and entropy generation in a porous vented square cavity with isothermally hot side walls for various aspect ratios of the enclosure, various positions of the inlet and outlet, and different inlet width to cavity width ratios....
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TL;DR: In this article, the authors analyzed the effect of the motion of horizontal walls on the entropy generation and heat transfer rates in an entrapped triangular porous cavity during mix-mix.
Abstract: The aim of the present investigation is to analyze the effect of the motion of horizontal walls on the entropy generation and heat transfer rates in an entrapped triangular porous cavity during mix...
4 citations
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TL;DR: In this paper, the authors analyzed the effect of the motion of horizontal and vertical walls on the entropy generation and heat transfer in a porous square cavity during mixed convection, and the results were presented using streamfunction (ψ), local entropy generation due to fluid friction, isotherms (θ), and local entropy generated due to heat-transfer contours.
Abstract: The aim of the present investigation is to analyze the effect of the motion of horizontal (cases 1a–1d) and vertical walls (case 2a–2c) on the entropy generation and heat transfer in a porous square cavity during mixed convection. The cavity is subject to the thermal boundary conditions such as the hot bottom wall, cold side walls, and thermally insulated top wall. Analysis has been done for various fluids with Prandtl number, Prm = 0.026–7.2, Grashof number, Gr = 105, Reynolds number, Re = 10–100, and Darcy number, Dam = 10−4–10−2. Numerical results are presented using streamfunction (ψ), local entropy generation due to fluid friction (Sψ), isotherms (θ), and local entropy generation due to heat-transfer (Sθ) contours. In addition, the total entropy generation (Stotal), average Bejan number (Beav), and overall heat-transfer rate at the hot bottom wall are analyzed and discussed.
6 citations
TL;DR: In this article, the authors analyzed the effect of the motion of horizontal walls on the entropy generation and heat transfer rates in an entrapped triangular porous cavity during mix-mix.
Abstract: The aim of the present investigation is to analyze the effect of the motion of horizontal walls on the entropy generation and heat transfer rates in an entrapped triangular porous cavity during mix...
4 citations