The Buoyant Plume-Driven Adiabatic Ceiling Temperature Revisited

[+] Author and Article Information
L. Y. Cooper

National Bureau of Standards, Gaithersburg, MD 20899

A. Woodhouse

University of Maryland, College Park, MD 20742

J. Heat Transfer 108(4), 822-826 (Nov 01, 1986) (5 pages) doi:10.1115/1.3247018 History: Received September 10, 1985; Online October 20, 2009


In previous works, convective heat transfer from buoyant plume-driven ceiling jets to unconfined ceilings has been estimated using a formula for the temperature distribution below an adiabatic ceiling T ad obtained from experimental data in the range 0 ≤ r /H < 0.7 (r is the radial distance from the plume and H is the plume source-to-ceiling distance). The present study re-evaluates these data, and develops an independent estimate for T ad . The analysis takes account of the effect of ceiling surface reradiation, and use is made of the previously established similarity between plume/ceiling- and jet/wall-driven heat transfer phenomena. The latter similarity is the basis of a correlation of recently reported free jet-wall jet “recovery temperature” data into a normalized T ad distribution. All of the analysis leads to new formulae for estimating the convective heat transfer to ceilings during enclosure fires. These new results confirm previous formulae, and extend them into the larger range 0 ≤ r /H ≤ 2.2.

Copyright © 1986 by ASME
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