NDLI: Downward flame spread over extruded polystyrene : Effects of sample thickness, pressure, and sidewalls

Content Provider	Springer Nature Link
Author	An, Weiguang Xiao, Huahua Liew, K. M. Jiang, Lin Yan, Weigang Zhou, Yang Huang, Xinjie Sun, Jinhua Gao, Lijing
Copyright Year	2014
Abstract	An experimental study on the characteristics of downward flame spread of extruded polystyrene (XPS) is presented. The parameters investigated include average mass loss rate per unit of thickness ( $$ \dot{m}^{'} $$ ), average flame height (H $_{f}$), average flame spread rate (v $_{f}$), and mass growth rate ( $$ \dot{m}_{1} $$ ) of molten XPS. The effects of sample thickness (d), sidewalls and atmospheric pressure (p), and the combined effects of these factors on the flame spread are studied. The larger sample thickness corresponds to larger $$ \dot{m}^{'} $$ and higher flame upon most occasions. As d rises, v $_{f}$ and $$ \dot{m}_{1} $$ increase under all conditions; v $_{f}$ and d follow the equation: $$ {\text{v}}_{\text f} = A ( 1- {\text{exp(}} - {\text{Cd))}} $$ . The dimensionless heat release rate: $$ \dot{Q}^{*} \propto { \exp }( - 0. 3d) $$ . $$ \dot{m}^{'} $$ , v $_{f}$ , and $$ \dot{m}_{1} $$ obtained without sidewalls are higher than those with sidewalls. $$ \dot{m}^{'} $$ , v $_{f,}$ and H $_{f}$ obtained on the plain (p = 100.8 kPa) are larger than those obtained on the plateau (p = 65.5 kPa). $$ \dot{m}_{1} $$ obtained on the plain is lower than that on the plateau. In most cases without sidewalls, $$ \dot{m} \propto p^{{\text n_{0}} } $$ , where 1.9 < n $_{0}$ < 2, and $$ H_{\text f} = a + \mu p^{{\text n_{0} }} $$ . H $_{f}$ obtained in the cases without sidewalls is larger than that with sidewalls when the sample thickness is small, while the opposite is true for thicker samples. When sidewalls are absent, on the plain, with a rise in thickness, the increase of v $_{f}$ is significant for thin samples while the variation is not considerable for thick samples; on the plateau, this increase is significant for all thicknesses tested. The experimental results agree well with the theoretical analysis.
Starting Page	1091
Ending Page	1103
Page Count	13
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	119
Issue Number	2
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-10-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Extruded polystyrene (XPS) Downward flame spread Heat transfer Thickness effects Sidewall effects Pressure effects Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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