Thermal Radiation Absorption in Rectangular-Groove Cavities

[+] Author and Article Information
E. M. Sparrow

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn.

V. K. Jonsson

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota

J. Appl. Mech 30(2), 237-244 (Jun 01, 1963) (8 pages) doi:10.1115/1.3636518 History: Received February 13, 1962; Online September 16, 2011


The amount of energy absorbed when a stream of external radiation enters a rectangular-groove cavity has been calculated for a variety of surface conditions, cavity depths, and incident energy distributions. The surfaces of the cavity are either diffuse reflectors or specular reflectors, and a wide range of reflectivity values has been considered. The incoming radiation is either diffusely distributed across the cavity opening or else arrives in a bundle of parallel rays. The results show that for diffuse incoming radiation, a specular cavity absorbs more effectively than does a diffuse cavity. For incoming radiation in a parallel ray bundle, the comparison depends on the angle of inclination of the rays.

Copyright © 1963 by ASME
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