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RESEARCH PAPERS: Heat Transfer in Porous Media

Investigation of Non-Darcian Forced Convection in an Asymmetrically Heated Sintered Porous Channel

[+] Author and Article Information
G. J. Hwang, C. C. Wu, C. H. Chao

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30043, Taiwan

J. Heat Transfer 117(3), 725-732 (Aug 01, 1995) (8 pages) doi:10.1115/1.2822636 History: Received October 01, 1993; Revised November 01, 1994; Online December 05, 2007

Abstract

A study of non-Darcian forced convection in an asymmetric heating sintered porous channel is carried out to investigate the feasibility of using this channel as a heat sink for high-performance forced air cooling in microelectronics. A volume-averaging technique is applied to obtain the macroscopic equations with the non-Darcian effects of no-slip boundary, flow inertia, and thermal dispersion. Local non-thermal-equilibrium is assumed between the solid and the fluid phases. The analysis reveals that the particle Reynolds number significantly affects the solid-to-fluid heat transfer coefficients. A wall function is introduced to model the transverse thermal dispersion process for the wall effect on the lateral mixing of fluid. The local heat transfer coefficient at the inlet is modeled by a modified impinging jet result, and the noninsulated thermal condition is considered at exit. The numerical results are found to be in good agreement with the experimental results in the ranges of 32 ≤ Red ≤ 428 and q = 0.8 ~ 3.2 W/cm2 for Pr = 0.71.

Copyright © 1995 by The American Society of Mechanical Engineers
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