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ISSN Online: 2377-424X

International Heat Transfer Conference 5
September, 3-7, 1974, Tokyo, Japan

RADIANT HEAT TRANSFER FOR ROUGH SURFACES

Get access (open in a dialog) DOI: 10.1615/IHTC5.3310
pages 36-40

Résumé

Radiant heat transfer between rough surfaces was examined with the objective of developing a relationship between surface specularity and optical roughness. It was established that a direction dependent surface property model provides excellent heat transfer results when a specular reflection model is employed for σ/λc ≤ 0.01 and when a diffuse reflection model is used for σ/λc ≥ 1.0. In the intermediate range, the direction dependent specular plus diffuse reflectance model yields excellent results when a correlation developed herein between surface specularity and optical roughness is employed. Recommendations are given for extending the correlation to other geometrical arrangements.