Title : Downward flame spread over PMMA sheets in quiescent air: Experimental and theoretical studies ( Downward flame spread over PMMA sheets in quiescent air: Experimental and theoretical studies )
Authors: Mohammad Bagher Ayani , Javad Abolfazli Esfahani , - - ,
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Abstract
To explore the flame spread mechanisms over noncharring material, downward flame spread over polymethy methacrylate (PMMA) sheets from 1.5 to 10-mm thick is studied experimentally in the quiescent air in an open space. The experimental results show the flame spread rate decreases with increasing thickness of sheets so that it trends to constant value for thick samples. Also the angle of pyrolysis region was measured by Digitizer machine that is roughly to be constant for different sheet thicknesses. In this study, a heat transfer model is proposed to examine the rate of heat transfer for noncharring materials. Base on this model and experimental results, a correlation between the flame spread rate and thickness is derived, which expresses the flame spread rate is proportional to inverse of sheet thickness. The proposed model estimated the convection heat flux and the gradient of temperature in the solid and gas phases. The experimental results confirm very well the results of the theoretical model.
Keywords
, combustion, downward flame spread, PMMA, combustible solid
@article{paperid:202215,
author = {Ayani, Mohammad Bagher and Abolfazli Esfahani, Javad and -, -},
title = {Downward flame spread over PMMA sheets in quiescent air: Experimental and theoretical studies},
journal = {Fire Safety Journal},
year = {2006},
volume = {41},
number = {2},
month = {February},
issn = {0379-7112},
pages = {164--169},
numpages = {5},
keywords = {combustion; downward flame spread; PMMA; combustible solid},
}
%0 Journal Article
%T Downward flame spread over PMMA sheets in quiescent air: Experimental and theoretical studies
%A Ayani, Mohammad Bagher
%A Abolfazli Esfahani, Javad
%A -, -
%J Fire Safety Journal
%@ 0379-7112
%D 2006
