Small Spacing Analysis of Radiative Transfer Between Parallel Metallic Surfaces

[+] Author and Article Information
R. F. Boehm

University of Utah, Salt Lake City, Utah

C. L. Tien

University of California, Berkeley, Calif.

J. Heat Transfer 92(3), 405-411 (Aug 01, 1970) (7 pages) doi:10.1115/1.3449676 History: Received January 02, 1969; Revised July 01, 1969; Online August 11, 2010


An attempt is made on the basis of electromagnetic theory to predict spacing effects on the radiative transfer between two closely-spaced, semi-infinite metals separated by a nonconducting dielectric. Electromagnetic energy transmission factors are derived for a general, three-medium system and their simplification for the metal-dielectric-metal system is shown. The net energy flux is calculated with these transmission factors and the estimated intensities in the metals. Numerical results are given which exhibit the effects of metal spacing, metal type, temperature level, and type of dielectric. Variations in the heat flux of several orders of magnitude are shown to exist in a system whereas the Stefan-Boltzmann relation indicates a constant flux, independent of spacing.

Copyright © 1970 by ASME
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