Theoretical analysis of the liquid thermal structure in a pool fire

IF 1.9 4区 工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY
T. Beji
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引用次数: 7

Abstract

This article presents a theoretical work on liquid heat-up in the case of a pool fire. It is assumed that the convective currents occurring within the upper layer of the liquid are induced by Rayleigh–Bénard instabilities that are caused by in-depth radiation. The upper layer depth has been estimated based on the analytical solution of a one-dimensional Fourier’s equation for the temperature with a source term for in-depth radiation. The model has been assessed against experimental data for a 9-cm-diameter methanol steady-state pool fire and three different liquid depths (18, 12 and 6 mm). The general trend, that is, increase in the upper layer depth as the bottom boundary temperature increases, is well captured. In order to ensure that the well-mixed upper layer is at a temperature near the boiling point (as suggested by the experimental data), an improvement is proposed based on a radiative heat balance integral method. In addition to the above, a novel methodology is developed for the calculation of the ‘effective’ thermal conductivity as a means to circumvent detailed calculations of heat transfer within the liquid.
水池火灾中液体热结构的理论分析
本文介绍了池火情况下液体加热的理论工作。假定在液体上层内发生的对流流是由深层辐射引起的瑞利-巴萨姆德不稳定性引起的。基于一维傅里叶温度方程的解析解估计了上层深度,其中有深度辐射的源项。该模型已根据9厘米直径的甲醇稳态池火和三种不同的液体深度(18,12和6mm)的实验数据进行了评估。总的趋势,即随着底边界温度的升高,上层深度增加,被很好地捕捉到了。为了保证混合良好的上层在沸点附近的温度(如实验数据所示),提出了基于辐射热平衡积分法的改进方法。除此之外,还开发了一种计算“有效”导热系数的新方法,以绕过液体内传热的详细计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Fire Sciences
Journal of Fire Sciences 工程技术-材料科学:综合
CiteScore
4.00
自引率
0.00%
发文量
14
审稿时长
2.5 months
期刊介绍: The Journal of Fire Sciences is a leading journal for the reporting of significant fundamental and applied research that brings understanding of fire chemistry and fire physics to fire safety. Its content is aimed toward the prevention and mitigation of the adverse effects of fires involving combustible materials, as well as development of new tools to better address fire safety needs. The Journal of Fire Sciences covers experimental or theoretical studies of fire initiation and growth, flame retardant chemistry, fire physics relative to material behavior, fire containment, fire threat to people and the environment and fire safety engineering. This journal is a member of the Committee on Publication Ethics (COPE).
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