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Experimental Study of the Exchange Flow Through a Horizontal Ceiling Vent in Atrium Fires: Criteria of Supply Air and Pressure Necessary for Uni-Directional Flow.


pdf icon Experimental Study of the Exchange Flow Through a Horizontal Ceiling Vent in Atrium Fires: Criteria of Supply Air and Pressure Necessary for Uni-Directional Flow. (672 K)
Yamada, T.

NISTIR 6030; June 1997.

U.S./Japan Government Cooperative Program on Natural Resources (UJNR). Fire Research and Safety. 13th Joint Panel Meeting. Volume 2. March 13-20, 1996, Gaithersburg, MD, Beall, K. A., Editor(s), 21-29 pp, 1997.

Available from:

National Technical Information Service
Order number: PB97-184204

Keywords:

fire safety; fire research; atria; ceilings; vents; flow rate; experiments; salt water; ceiling vents; oxygen consumption

Abstract:

This study is directed at understanding an exchange flow rate through a single top vent in an atrium-type compartment with a fire experimentally and obtaining basic knowledge of physical mechanism for developing a comprehensive atrium fire model. A series of experiments was conducted with two reduced scale cubic models with propane gas burner as a heat source. Under various conditions of heat release rate and top vent area, the exchange flow rates were estimated by oxygen consumption method. The result indicates that the dimensionless exchange rate of hot/cool gas is closed to an experimental constant value obtained by salt-water experiments in the past under small vent aspect ratio condition.