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ABSORPTIVITIES OF DIFFUSE CYLINDRICAL CAVITIES

J. Galindo
Ecole Polytechnique, P.O. Box 6079, Station "A", Montreal, НЗС 3A7 Canada

E. Bilgen
Ecole Polytechnique, P.O. Box 6079, Station "A", Montreal, Canada

Abstract

Local apparent wall absorptivities and overall absorptivities of diffuse cylindrical cavities with and without a circular diaphragm are calculated; following parametric values are considered: the surface absorptiv1ties, depth to radius and aperture to cavity radii ratios and various distributions of incoming radiation. The case of concentrated solar radiation distribution coming from a solar furnace has been studied in detail. The theoretical results are compared with those experimental obtained with various cavities without diaphragm at the focal point of a solar furnace. It has been found that for all the wall absorptivities, the cavity absorptivity increases with increasing length to radius ratio up to about 4 above which it becomes less pronounced; this dependency is more pronounced with smaller wall absorptivities.

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