Thermal Radiation from a Microscopically Roughened Dielectric Surface

[+] Author and Article Information
R. P. Caren, C. K. Liu

Engineering Sciences, Lockheed Palo Alto Research Laboratory, Palo Alto, Calif.

J. Heat Transfer 94(1), 73-79 (Feb 01, 1972) (7 pages) doi:10.1115/1.3449875 History: Received December 29, 1970; Online August 11, 2010


The emission of thermal radiation from a microscopically roughened dielectric surface is treated using a laminar-inhomogeneous layered model for a representation of the effective spatial variation in refractive index associated with a roughened surface layer. The Riccati equation is used to calculate the modification to the spectral angular transmittance of the surface due to the presence of this inhomogeneous surface layer. A consideration of the emission of radiant energy from the bulk dielectric through the surface layer permits the angular emittance to be determined. Total emittance values are obtained using the spectral angular emittance data.

Copyright © 1972 by ASME
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