scholarly journals THERMAL MODELING OF UPWARD FLAME SPREAD ALONG A VERTICAL COMBUSTIBLE SOLID : Part II-Implications to wall flame heat transfer and prediction of spontaneous flame spreading process

1987 ◽  
Vol 375 (0) ◽  
pp. 141-147
Author(s):  
YUJI HASEMI
Keyword(s):  
Heat Transfer ◽  
Flame Spread ◽  
Thermal Modeling ◽  
Spreading Process ◽  
Flame Spreading ◽  
Upward Flame Spread ◽  
Solid Part

scholarly journals Influence of U-shaped structure on upward flame spread and heat transfer behaviors of PMMA used in building thermal engineering

2020 ◽  
Vol 22 ◽  
pp. 100794
Author(s):  
Weiguang An ◽  
Xiangwei Yin ◽  
Minglun Cai ◽  
Yanhua Tang ◽  
Qing Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flame Spread ◽  
Thermal Engineering ◽  
Upward Flame Spread

Experimental study of the width effects on self-induced buoyant blow off in upward flame spread over thin fabric fuels

2019 ◽  
Vol 90 (11-12) ◽  
pp. 1404-1413 ◽  
Author(s):  
Guoqing Zhu ◽  
Yunji Gao ◽  
Guoqiang Chai ◽  
Jinju Zhou ◽  
Shuai Gao
Keyword(s):  
Flame Spread ◽  
Flame Length ◽  
Flame Height ◽  
Spread Rate ◽  
Fire Control ◽  
Constant Length ◽  
Flame Spreading ◽  
Upward Flame Spread ◽  
Flame Thickness ◽  
Induced Velocity

In this paper, a series of upward flame spreading experiments were conducted on thin flax fabric with various widths ranging from 3.0 to 8.0 cm and length of 1.6 m. Symmetric ignition at the entire bottom edge of samples led to two-sided upward flame growth initially. A very interesting behavior of flame blown off was observed in upward flame spreading and an explanation was provided based on the increased buoyancy-induced velocity at the flame base. When the sample width is 6 cm or less, the flame length increases to a critical value and, correspondingly, the buoyancy-induced velocity reaches the blow off velocity, which results in a flame being blown off on one side. The remaining flame on the other side would shrink in length and propagate to the end of the sample with an asymptotically constant length and steady spread rate. For samples wider than 6 cm, the two-sided flame continues to spread to the end of samples and the self-induced blow off phenomenon is not observed. Moreover, the width effects on the flame height, flame thickness and flame spread rate are analyzed and explained in this paper. The results of this study may help advance better understanding of flame blow off behaviors over solid surfaces and have implications concerning fire control of flame spread over solid fuels.

scholarly journals Influences of Sub-Atmospheric Pressure on Upward Flame Spread over Flexible Polyurethane Foam Board with Multiple Inclinations

2020 ◽  
Vol 10 (20) ◽  
pp. 7117
Author(s):  
Ran Tu ◽  
Xin Ma ◽  
Yi Zeng ◽  
Xuejin Zhou ◽  
Qixing Zhang
Keyword(s):  
Heat Transfer ◽  
Flame Spread ◽  
Burning Surface ◽  
Flame Length ◽  
Coupling Effects ◽  
Fire Dynamics ◽  
Upward Flame Spread ◽  
Inclination Angles ◽  
The Individual ◽  
Flexible Polyurethane

Fire propagation and burning characteristics of upward flame spread over flexible polyurethane (FPU) foam board were investigated under coupling effects of pressure and orientation. As a further comparative research of our previous work, three pressures (70, 85 and 100 kPa) and four fuel surface inclination angles (0°, 30°, 60°, 90°) were applied, respectively, as before, to study the variation of typical parameters including flame spread rate (FSR), burning rate, heat transfer components, flame length, etc. First, a phenomenological interpretation was taken to show the special spreading process with melting flow combustion and flash burning observed. Second, an overall theoretical analysis was proposed to reveal the individual or coupling effects of pressure and inclined burning surface on spreading behavior. A semi-quantitative correlation was developed and formulated to show the tendency of FSR as a function of pressure, inclination and other burning parameters, which was validated by data in paper. Meanwhile, comparison of detailed differences between upward and downward spread was conducted to give a full insight on FPU fire development. At last, comprehensive discussions of coupling effects on variation of spreading characteristics and heat transfer mechanisms were performed based on fire dynamics.

Heat Transfer Pathways in Flame Spreading Over Thick Fuels as a Function of the Flame Spread Regime: Microgravity, Thermal, and Kinetic

1997 ◽  
Vol 127 (1-6) ◽  
pp. 119-140 ◽  
Author(s):  
Jeff West ◽  
Matt King ◽  
Subrata Bhatiachar,Iee ◽  
Robert A. Altenkirch
Keyword(s):  
Heat Transfer ◽  
Flame Spread ◽  
Flame Spreading

scholarly journals Upward Flame Spread: Heat Transfer To The Unburned Surface

2003 ◽  
Vol 7 ◽  
pp. 117-127 ◽  
Author(s):  
T. Kuang-chung ◽  
J. Turnbull ◽  
G. Will ◽  
D. Drysdale
Keyword(s):  
Heat Transfer ◽  
Flame Spread ◽  
Upward Flame Spread
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