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RESEARCH PAPERS

Effects of Roughness of Metal Surfaces on Angular Distribution of Monochromatic Reflected Radiation

[+] Author and Article Information
R. C. Birkebak

Museum of Natural History, University of Minnesota, Minneapolis, Minn.

E. R. G. Eckert

University of Minnesota, Minneapolis, Minn.

J. Heat Transfer 87(1), 85-93 (Feb 01, 1965) (9 pages) doi:10.1115/1.3689061 History: Received May 20, 1964

Abstract

A detailed experimental study has been carried out to examine the influence of surface roughness conditions on the reflection characteristics of metal surfaces for monochromatic thermal radiation. Surfaces used were prepared by standard optical grinding techniques using a range of sizes of grit of the grinding compounds. Various definitions of reflectances are presented to facilitate in the discussion of the results. Biangular, specular, and hemispherical-angular reflectance measurements are discussed in terms of the optical root-mean-square surface roughness, wavelength of reflected radiation, and surface material. The experimental results are compared with the available predictions from theoretical analysis.

Copyright © 1965 by ASME
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