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research-article

Analysis of heat transfer and entropy generation in a channel partially filled with N-layer porous media

[+] Author and Article Information
Kun Yang

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, P.R. China
yangk@hust.edu.cn

Hao Chen

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, P.R. China
ch_hust@163.com

Jiabing Wang

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, P.R. China
wjb@hust.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4038909 History: Received August 30, 2017; Revised December 17, 2017

Abstract

Convective heat transfer in the channel partially filled with porous medium prevails in many engineering applications. Many existing literatures focused on the channel partially filled with single layer porous medium. However, the problem of heat transfer and entropy generation inside the channel partially filled with N-layer porous media is analyzed in this work, in which the Darcy-Brinkman model and the local thermal non-equilibrium model are used to describe the flow and heat transfer within the porous region, respectively. Besides, the stress jump boundary condition and the heat flux jump boundary condition are adopted to describe momentum and heat transfer at the porous-free fluid interface, while the stress continuity boundary condition and the heat flux continuity boundary condition are used at the interface between two different porous layers. The analytical solutions of the velocity and temperature profiles for the channel are derived, which are utilized to calculate the overall Nusselt number, the total entropy generation rate, the Bejan number and the friction factor. Furthermore, the flow and heat transfer performances of the channel partially filled with 3-layer porous media are studied.

Copyright (c) 2017 by ASME
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