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Transient combined laminar free convection and radiation in a rectangular enclosure

Published online by Cambridge University Press:  11 April 2006

D. W. Larson  and
R. Viskanta
D. W. Larson
Affiliation:
Sandia Laboratories, Albuquerque, New Mexico 87115
R. Viskanta
Affiliation:
Purdue University, West Lafayette, Indiana 47907
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Abstract

The mass, momentum and energy-transfer equations are solved to determine the response of a rectangular enclosure to a fire or other high-temperature heat source. The effects of non-participating radiation, wall heat conduction, and laminar natural convection are examined. The results indicate that radiation dominates the heat transfer in the enclosure and alters the convective flow patterns significantly. At a dimensionless time of 5·0 the surface of the wall opposite a vertical heated wall has achieved over 99% of the hot-wall temperature when radiation is included but has yet to change from the initial temperature for pure convection in the enclosure. At the same time the air at the centre of the enclosure achieves 33% and 13% of the hot-wall temperature with and without radiation, respectively. For a hot upper wall the convection velocities are not only opposite in direction but an order of magnitude larger when radiation transfer between the walls is included.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 78 , Issue 1 , 5 November 1976 , pp. 65 - 85
Copyright
© 1976 Cambridge University Press

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