zone fire


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zone fire

[′zōn ‚fīr]
(ordnance)
Artillery or mortar fire that is designed to cover an area in which a target is situated.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Zone fire models are simple models that consider a fire compartment to be divided into two zones: (1) a smoke layer and (2) a lower layer that is free or nearly free of combustion products.
In a zone fire model, the smoke layer has a uniform temperature and uniform concentrations.
Zone fire models do not simulate the transition zone, but the bottom of the smoke layer is simulated as a horizontal plane called the smoke layer interface as shown in Figure 3B.
Zone fire models do not simulate the time it takes for the plume to reach the ceiling, which is small in a normal size room but larger in an atrium.