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TECHNICAL BRIEFS

Extrapolation Errors in Thermal Contact Resistance Measurements

[+] Author and Article Information
T. R. Thomas

Teesside Polytechnic, Middlesbrough, Cleveland TS1 3BA, United Kingdom

J. Heat Transfer 97(2), 305-307 (May 01, 1975) (3 pages) doi:10.1115/1.3450364 History: Received October 22, 1974; Online August 11, 2010

Abstract

In the classic split-bar determination of thermal contact resistance the temperature drop across the interface is estimated by extrapolating a temperature gradient measured remotely. It is shown that this can give rise to substantial errors which cannot greatly be reduced by increasing the number of measurements. It is suggested that due to extrapolation errors few interface temperature drops have ever been determined to better than 1/2 °K, and that this may account for some of the discrepancies between published contact resistances, particularly those measured at high loads.

Copyright © 1975 by ASME
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