Emittance of Oxide Layers on a Metal Substrate

[+] Author and Article Information
R. R. Brannon, R. J. Goldstein

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn.

J. Heat Transfer 92(2), 257-263 (May 01, 1970) (7 pages) doi:10.1115/1.3449658 History: Received January 02, 1969; Revised June 12, 1969; Online August 11, 2010


The variation of total normal emittance as a function of oxide thickness on a metal sub strate is investigated experimentally for Al-Al2 O3 and Cu-CuO systems. The measurements are made using a comparative black-body technique. Over the range of aluminumoxide thicknesses investigated (1.2μ–86.4μ) the total normal emittance varies from 0.15–0.92 for a sample temperature of 96 deg C. With a copper-oxide thickness range from 1.2μ–5.6μ, the total normal emittance varies from 0.09–0.81 at 96 deg C. An analytical solution to the foregoing problem is formulated and the total normal emittance of the anodized aluminum samples is computed. Although the theoretical values are lower than the measured values, the effect of increasing oxide thickness on emittance is similar.

Copyright © 1970 by ASME
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