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Entropy 2017, 19(4), 171; doi:10.3390/e19040171

Entropy Generation of Double Diffusive Forced Convection in Porous Channels with Thick Walls and Soret Effect

1
The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
2
Young Researchers and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran 19166, Iran
*
Authors to whom correspondence should be addressed.
Academic Editor: Yan Jin
Received: 14 March 2017 / Revised: 13 April 2017 / Accepted: 13 April 2017 / Published: 15 April 2017
(This article belongs to the Special Issue Entropy in Computational Fluid Dynamics)
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Abstract

The second law performance of double diffusive forced convection in a horizontal porous channel with thick walls was considered. The Soret effect is included in the concentration equation and the first order chemical reaction was chosen for the concentration boundary conditions at the porous-solid walls interfaces. This investigation is focused on two principal types of boundary conditions. The first assumes a constant temperature condition at the outer surfaces of the solid walls, and the second assumes a constant heat flux at the lower wall and convection heat transfer at the upper wall. After obtaining the velocity, temperature and concentration distributions, the local and total entropy generation formulations were used to visualize the second law performance of the two cases. The results indicate that the total entropy generation rate is directly related to the lower wall thickness. Interestingly, it was observed that the total entropy generation rate for the second case reaches a minimum value, if the upper and lower wall thicknesses are chosen correctly. However, this observation was not true for the first case. These analyses can be useful for the design of microreactors and microcombustor systems when the second law analysis is taken into account. View Full-Text
Keywords: entropy generation; double diffusion; first order chemical reaction; porous channels; Soret effect entropy generation; double diffusion; first order chemical reaction; porous channels; Soret effect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Torabi, M.; Torabi, M.; Peterson, G.B. Entropy Generation of Double Diffusive Forced Convection in Porous Channels with Thick Walls and Soret Effect. Entropy 2017, 19, 171.

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