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research-article

Forced convective heat transfer in a channel filled with a functionally graded metal foam matrix

[+] Author and Article Information
Xiaohui Bai

Dept. of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561 Japan
xiaohui.bai.16@shizuoka.ac.jp

Fujio Kuwahara

Dept. of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561 Japan
kuwahara.fujio@shizuoka.ac.jp

Moghtada Mobedi

Dept. of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561 Japan
moghtada.mobedi@shizuoka.ac.jp

Akira Nakayama

Dept. of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561 Japan; School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, Hubei, China
nakayama.akira@shizuoka.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4040613 History: Received March 20, 2018; Revised June 11, 2018

Abstract

Fully developed forced convective heat transfer within a channel filled with a functionally graded metal foam matrix was investigated analytically for the case of constant wall heat flux. A series of functionally graded metal foam matrices of the same mass (i.e. the same solidity) were examined in views of their heat transfer performances. The porosity either increases or decreases towards the heated wall following a parabolic function. Among the metal foam matrices of the same mass, the maximum heat transfer coefficient exists for the case in which the porosity decreases towards the heated wall (i.e. more metal near the wall). The heat transfer coefficients in such channels filled with a functionally graded metal foam matrix are found 20 to 50 % higher than that expected from the increase in the effective thermal conductivity. Hence, functionally graded metal foam matrices are quite effective to achieve substantially high heat transfer coefficient with an acceptable increase in pressure drop.

Copyright (c) 2018 by ASME
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