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RESEARCH PAPERS: Thermal Conduction

Thermal Gap Conductance of Conforming Surfaces in Contact

[+] Author and Article Information
S. Song

International Business Machine Corporation, Poughkeepsie, NY 12602

M. M. Yovanovich

Microelectronics Heat Transfer Laboratory, Department of Mechanical Engineering

F. O. Goodman

Department of Applied Mathematics and Department of Physics, University of Waterloo, Waterloo, Ontario, Canada

J. Heat Transfer 115(3), 533-540 (Aug 01, 1993) (8 pages) doi:10.1115/1.2910719 History: Received April 01, 1992; Revised February 01, 1993; Online May 23, 2008

Abstract

Heat transfer through gas layers of contact interfaces formed by two microscopically rough surfaces is studied. Rarefied gas conduction between smooth parallel plates is examined with data obtained from the literature. Two important dimensionless parameters are introduced; one representing the ratio of the rarefied gas resistance to the continuum gas resistance, and the other representing gas rarefaction effects. Effects of gas rarefaction and surface roughness are studied in relation to the parallel plates case. It is proposed that the effective gap thickness at light loads may be estimate by a roughness parameter, the maximum peak height Rp . Experiments were performed to measure gap conductance for a number of Stainless Steel 304 pairs and Nickel 200 pairs over a range of roughnesses and gas pressures. Three different types of gases, helium, argon, and nitrogen, were employed as the interstitial gas. The comparison between the theory and the measured values of gap conductance shows excellent agreement.

Copyright © 1993 by The American Society of Mechanical Engineers
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