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RESEARCH PAPERS

An Experimental Investigation of Heat Transfer in Variable Porosity Media

[+] Author and Article Information
K. Vafai

The Ohio State University, Columbus, OH

R. L. Alkire

Owens-Corning Fiberglas, Granville, OH

C. L. Tien

University of California, Berkeley, CA

J. Heat Transfer 107(3), 642-647 (Aug 01, 1985) (6 pages) doi:10.1115/1.3247472 History: Received March 26, 1984; Online October 20, 2009

Abstract

This paper presents an experimental investigation on the effects of a solid impermeable boundary and variable porosity on forced convection in porous media. Emphasis is placed on the channeling effects on heat transfer in packed beds. The local volume-averaging technique is used to establish the governing equations and a numerical scheme is developed which incorporates the boundary and variable porosity effects on heat transfer. The experimental results for the heat flux at the boundary are presented as a function of the pertinent variables in a packed bed. The Nusselt number is found to increase almost linearly with an increase in the Reynolds number based on the pore diameter. The experimental results are found to be in good agreement with the theoretical results which account for the variable porosity effects. A comparison between the numerical and the experimental results demonstrates the importance of boundary and variable porosity effects on heat transfer in variable porosity media.

Copyright © 1985 by ASME
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