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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of finite dimension on downward flame spread over PMMA slabs: Experimental and theoretical study
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Effect of finite dimension on downward flame spread over PMMA slabs: Experimental and theoretical study

机译：有限尺寸对PMMA平板向下火焰蔓延的影响：实验和理论研究

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摘要

This work investigates experimentally and theoretically the heat and mass transfer process of downward flame spread over finite width polymethyl methacrylate (PMMA) slabs in quiescent air. A series of experiments with different sample dimensions, 3,4,5 and 6 mm thick and 1.5-12 cm wide, are conducted and a solid phase flame spread model is developed to predict the behaviors during the process. Being different from the 2-D condition, an inverse 'V shape leading edge, accelerated mass loss rate and spread rate exist due to the lateral combustion of samples and enhanced oxygen diffusion. The angle of leading edge increases with increasing width for 3 mm slabs, whereas no significant change occurs for thicker samples. The analytical model indicates that the mass loss rate and spread rate are functions of thermal parameters, leading edge angle and geometry of material. For fixed thickness, a linear relationship exists between the mass loss rate and width, while the spread rate is inversely proportional to the width of sample. The model also supplies two methods to estimate the heat flux ahead of leading edge and on the pyrolysis surface: by measured mass loss rate or flame spread rate. The validity of the proposed model is verified by the good agreement between the experimental and predicted results.
机译：这项工作从理论和实验上研究了静态火焰中有限宽度的聚甲基丙烯酸甲酯（PMMA）平板上向下火焰传播的传热和传质过程。进行了一系列具有不同样品尺寸（厚3、4、5和6毫米，宽1.5至12厘米）的实验，并开发了固相火焰扩散模型来预测过程中的行为。与2-D条件不同，由于样品的横向燃烧和增强的氧扩散，存在“ V”字形的前缘，加速的质量损失率和扩散率。对于3 mm的平板，前缘的角度随宽度的增加而增加，而较厚的样品则没有明显的变化。分析模型表明，质量损失率和扩散率是热参数，前缘角和材料几何形状的函数。对于固定厚度，质量损失率与宽度之间存在线性关系，而扩展率与样品宽度成反比。该模型还提供了两种方法来估计前沿和热解表面上的热通量：通过测量的质量损失率或火焰扩散率。实验和预测结果之间的良好一致性验证了所提模型的有效性。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第12期|225-234|共10页
  • 作者

    Junhui Gong; Xiaodong Zhou; Jing Li; Lizhong Yang;

  • 作者单位

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, China ,College of Urban Construction and Safety Engineering, Nanjing University of Technology, Nanjing 210009, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, China;

    University of New Haven, Department of Fire Science & Professional Studies, Henry C. Lee College of Criminal Justice and Forensic Sciences, West Haven, CT 06516, United States;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, China ,Collaborative Innovation Center for Urban Public Safety, Anhui Province, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Downward flame spread; PMMA; Finite dimensions; Combustion;

    机译：向下火焰蔓延;PMMA;尺寸有限;燃烧;

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