Effect of Parallel Curtain Walls on Upward Flame Spread Characteristics and Mass Loss Rate Over PMMA

Zhao, Zunxin; Tang, Fei; Chen, Lei; Zhang, Yaobi; Wen, Jennifer X.

doi:10.1007/s10694-021-01179-x

Cited by 2 publications

(1 citation statement)

References 35 publications

(43 reference statements)

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“…These studies largely focused on different fuel attributes (e.g. area density, 1,2 sample width), [2][3][4] ambient conditions (pressure, 3,5 oxygen concentration, 3,[5][6][7] flow speed), 5,6,8 flow confinement, 9,10 and sample inclination angle. 11,12 It was observed that upward flame spread under normal gravity is one of the most hazardous flame spread scenarios.…”

Section: Introductionmentioning

confidence: 99%

Upward flame spread over discrete thin solids separated by heat-absorbing inert materials

Cui

Sharma

Liao

2023

Journal of Fire Sciences

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Flame spread over discrete solid fuels has been of key research interest in the past few decades. Most studies considered an array of discrete fuels separated by air gaps or heat-insulating inert materials. The effects of heat loss due to the discrete configuration are not well understood. The present study aims to bridge this knowledge gap. A series of experiments are performed using a vertical array of thin discrete fuels separated by heat-absorbing inert materials of different thicknesses. For comparisons, experiments are also performed using discrete fuels separated by air gaps and using continuous fuel. The flame base spread rate is found to be generally higher in discrete fuel than in continuous fuel configurations, due to a reduced fuel load per unit length. It is also found that the air and inert gaps have opposite effects on the solid burning rates. The air gaps break the no-slip boundary, allowing the laterally entrained buoyancy flow (normal to the sample surface) to push the flame closer to the samples. This leads to an enhanced heat flux on the sample surface and an increased solid burning rate. On the other hand, the inert materials retain the flow boundary profile and act as a heat sink during flame spread, thereby reducing the solid burning rate. As the inert thickness increases, flame spread rate and solid burning rate decrease. Based on these observations, an existing model for flame spread rate is updated by incorporating the heat-absorbing effects of the gaps. The correlation is validated using the experimental data.

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Section: Introductionmentioning

confidence: 99%

Upward flame spread over discrete thin solids separated by heat-absorbing inert materials

Cui

Sharma

Liao

2023

Journal of Fire Sciences

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A Review of Combustion and Flame Spread over Thermoplastic Materials: Research Advances and Prospects

Chen

Feng

Nie

et al. 2023

Fire

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As thermoplastic materials are widely used in buildings, the fire hazards of thermoplastic materials are increasingly becoming a central issue in fire safety research due to their unique pyrolysis and melting mechanisms. In this paper, the features and common types of thermoplastic materials are introduced first. Then, the combustion behavior of thermoplastic materials is theoretically analyzed based on the empirical formulas and heat balance equations, such as the pyrolysis kinetics, ignition time, melting and dripping, flame, burning rate and mass loss rate, temperature and heat flow, gas products, and influencing factors. The influencing factors basically include the sample properties (width, incline angle, and thickness, etc.), the façade structure (sidewalls, curtain wall, etc.), the ambient conditions (altitude, pressure, and gravity, etc.), and the flame retardant treatment. Similarly, this study also illustrates the vertical and horizontal flame spread behavior of the thermoplastic materials and the influencing factors. The utilized methods include the experimental methods, the analytical methodologies, and the approaches for numerical simulation. Finally, the problems encountered at this stage and worthy of further study in the future are presented.

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Effect of Parallel Curtain Walls on Upward Flame Spread Characteristics and Mass Loss Rate Over PMMA

Abstract: How to cite:Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 2 publications

References 35 publications

Upward flame spread over discrete thin solids separated by heat-absorbing inert materials

Upward flame spread over discrete thin solids separated by heat-absorbing inert materials

A Review of Combustion and Flame Spread over Thermoplastic Materials: Research Advances and Prospects

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