الفهرس 
صفحة العنوانOnly 14 pages are availabe for public view
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Abstract
Nowadays, firefighting considerations are mandatory for all projects all over the
world. Water based automatic firefighting systems are widely used because of their
effectiveness, reliability and economic considerations. Recently, water mist
firefighting systems have proved to be an effective fire fighting performance. The
present study is based on Computational Fluid Dynamics (CFD) investigation using
FDS code (Fire Dynamic Simulation) in order to specify the effect of water mist
droplet size, flow rate, and working pressure on gaseous fire suppression
performance. Methane has been used as a gaseous burning fuel. Fire extinguishment
time has been used as an indication for fire suppression effectiveness. Results show
that the most dominant parameter for water mist gaseous fire suppression
performance is droplet size. Large droplets water mist (400 urn up to 1000 urn) did
not extinguish the gaseous fire regardless of the used flow rate or working pressure.
Small droplets water mist (up to 250 urn) showed good performance. Increasing flow
rate with small water mist droplets has improved extinguishment performance.
Working pressure did not show any effect on gaseous fire suppression. So, low
pressure small droplet water mist can be used effectively in gaseous firefighting
p” ” " ~ " ” ”rposes. Finally, optimum values of studied parameters to obtain the optimum
gaseous fire suppression performance using water mist have been identified (D =
}oOllm, Q = 20 l/min, and P = 2.5 bar).