Influence of air-gap and thickness on the upward flame spread over discrete wood chips

Zhou, Baoxue; Wang, Kai; Xu, Min; Wangyu, Yang; Zhu, Feng; Sun, Biao; Wang, Xuan; Ke, Wei

doi:10.1016/j.tsep.2021.101106

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…As the platinum plate moves downward, the surface tension gradually increases. The surface tension is calculated according to the balancing force and the surface area of the platinum sheet 22,23 . A foam scanner (Kruss, Germany) is used to obtain the microscopic foam structure characteristic parameters, as shown in Figure 3.…”

Section: Methodsmentioning

confidence: 99%

“…The surface tension is calculated according to the balancing force and the surface area of the platinum sheet. 22,23 A foam scanner (Kruss, Germany) is used to obtain the microscopic foam structure characteristic parameters, as shown in Figure 3. With the help of optical instruments, the height attenuation of foam can be monitored in time and the bubble size distribution at the micron level can be obtained.…”

Section: Key Parameters Of Micro-scale Foam Test and Working Conditio...mentioning

confidence: 99%

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Experimental study on the quantitative evaluation of the thermal stability performance and heat insulation characteristics of fire‐fighting foam

Wang,

Jiang,

Yang

et al. 2023

Fire and Materials

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Foam extinguishing agents are crucial for the suppression of flammable liquid fires. Their thermal stability performance and heat insulation characteristics are critical indicators to evaluate the efficiency of the fire‐fighting foam. There have been some studies focused on exploring the behavior of fire‐fighting foams exposed to radiant heating. However, the decay mechanisms and heat transfer behaviors of the foam at the micro‐scale are still unclear and require further clarification. Therefore, in this study, the volume reduction coefficient, falling time of foam column height, and the temperature profiles of the foam layer under the thermal radiation environment of different conditions are discussed. The results indicate that the high temperature generated by the radiative heat flux will accelerate the collapse rate of the foam layer. The stability of the foam structure will be seriously damaged. There is a relationship between heat radiation intensity and foam attenuation coefficient. The empirical model for reflecting the fire‐fighting foam collapse process under the fire environment with high heat radiation flux is modified. Moreover, the average collapse rate and temperature difference gradient are used to characterize the thermal stability performance and heat insulation characteristics of the foam. Analysis of the micro‐scale foam structure parameters from the foam scans has revealed that the thermal stability performance and heat insulation characteristics of the foam are stronger when the surface tension of the foam is within the range of 17.4–20.4 mN/m.

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Section: Methodsmentioning

confidence: 99%

Section: Key Parameters Of Micro-scale Foam Test and Working Conditio...mentioning

confidence: 99%

Experimental study on the quantitative evaluation of the thermal stability performance and heat insulation characteristics of fire‐fighting foam

Wang,

Jiang,

Yang

et al. 2023

Fire and Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…The process of spreading flame and igniting its adjacent fuel can also be regarded as the spread of flame on discontinuous materials. There are several experimental studies about the flame spread over discretely distributed combustible materials [1,22,23]. There are some simplified numerical simulations of the flame spread of discontinuous materials [21] to determine the flame spread rate.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Downward Flame Propagation in Discontinuous Region of Solid Fuel

Zhu

Luo

Zhao

et al. 2023

Fire

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This paper presents a numerical model that investigates the characteristics of flow, heat, and mass transfer on downward flame propagation in the discontinuous region of solid fuel. Simulations were carried out for various discontinuous distances to analyze the morphology of the flame front and the competition between the “jump” of flame spread and heat transfer from the flame to the unburned area. The results demonstrate that there is a “jump” in the flame propagation in the discontinuous zone, with the flame front exhibiting a defined “acute angle” that undergoes a process from large to small during the flame spreading in the discontinuous area and deflects towards the discontinuous area of the material. The temperature in the discontinuous zone reaches a peak, and the average flame spread rate initially increases and then decreases with the increase of discontinuity distance until the flame spread stops. The study provides valuable insights into the growth and development of fires involving discretely distributed combustible materials.

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Heat flux and flame spread rate of discrete PMMA in concave building facade with window intervals

Wang,

Cai,

et al. 2023

J Therm Anal Calorim

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Influence of air-gap and thickness on the upward flame spread over discrete wood chips

Cited by 9 publications

References 18 publications

Experimental study on the quantitative evaluation of the thermal stability performance and heat insulation characteristics of fire‐fighting foam

Experimental study on the quantitative evaluation of the thermal stability performance and heat insulation characteristics of fire‐fighting foam

Numerical Simulation of Downward Flame Propagation in Discontinuous Region of Solid Fuel

Heat flux and flame spread rate of discrete PMMA in concave building facade with window intervals

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