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RESEARCH PAPERS: Radiative Transfer

Spectral Emissivity of Optically Anisotropic Solid Media

[+] Author and Article Information
C. G. Malone, B. I. Choi, M. I. Flik, E. G. Cravalho

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Heat Transfer 115(4), 1021-1028 (Nov 01, 1993) (8 pages) doi:10.1115/1.2911356 History: Received April 01, 1992; Revised December 01, 1992; Online May 23, 2008

Abstract

This work determines the spectral emissivity of a semi-infinite uniaxial medium in vacuum. If the optic axis is normal to the surface, then, for many materials and wavelengths, such as rutile between 10 and 25 μm, the directional and hemispherical spectral emissivities of the medium can be approximated, with an error of less than 10 percent, as those of an isotropic medium possessing the ordinary optical constants. In contrast, if the optic axis is parallel to the surface, the directional and hemispherical spectral emissivities can be predicted only by accounting for the optical anisotropy of the medium. Measurements of the directional emissivities of rutile crystals conform to the theoretical predictions.

Copyright © 1993 by The American Society of Mechanical Engineers
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