کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
270419 504755 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A computational and experimental study of ultra fine water mist as a total flooding agent
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
A computational and experimental study of ultra fine water mist as a total flooding agent
چکیده انگلیسی

Computational fluid dynamics (CFD) calculations were carried out to design total flooding fire tests in a 28 m3 compartment for an ultra fine water mist (<10 μm). The exit momentum of the mist produced by a proprietary ultrasonic generator technology was extremely low with a mist discharge velocity below 1 m/s. The mist was discharged with multiple floor outlets equally spaced around the centrally located 120 kW pool-like gas fire. The transport of mist and its interaction with the fire was simulated by Fluent, a commercial CFD model. Lagrangian Discrete Phase Model (DPM) was used for droplets. Simulation predicted extinguishment within 10 s with a mist delivery rate of 1 l/min. However, in total flooding fire tests conducted, extinction times were more than 5 min. Additional computations approximating the ultra fine mist (UFM) as a dense gas agreed well with the observed transport timescales of minutes indicating that UFM behaves like a gas. Further, the mist–fire interaction needs a multi-phase Euler–Euler approach with a droplet vaporization model.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fire Safety Journal - Volume 42, Issue 2, March 2007, Pages 150–160
نویسندگان
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