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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Energy and Enviromental Engineering     
Numerical simulation of pyrolysis of PMMA involving surface and in-depth absorption
GONG Jun hui, CHEN Yi xuan, LI Jin, ZHOU Yang
1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China;
2. Department of Fire Science, University of New Haven, West Haven 06516, United States;
3. Department of Fire Protection Engineering, Central South University, Changsha 410075, China
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Abstract  

 The effects of absorption models on the gasification process of PMMA exposed to an incident heat flux were investigated. A numerical one-dimension model was established to analyze the influence of absorption mode, including surface and in-depth absorption, on pyrolysis process of clear PMMA sample which was exposed to an external heat flux. The corresponding cone calorimetry tests in nitrogen atmosphere that were conducted by the developed model. Some important simulation results were discussed, including mass loss rate, top and bottom surface temperature, temperature distribution in solid. The capability of the model was verified by the comparison between experimental and simulation results. Results showed that some detailed behaviors of the thermal degradation were significantly affected by the absorption modes, like temperature in solid, top surface temperature and initiation of pyrolysis etc. Both hypotheses were acceptable within predicting bench scale experiments．

Published: 28 October 2016
CLC:  X 932  
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Cite this article:

GONG Jun hui, CHEN Yi xuan, LI Jin, ZHOU Yang. Numerical simulation of pyrolysis of PMMA involving surface and in-depth absorption. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(10): 1879-1888.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.10.007     OR     http://www.zjujournals.com/eng/Y2016/V50/I10/1879


PMMA表面与深度吸收热解过程数值模拟

通过建立一维热解模型,对聚甲基丙烯酸甲酯(PMMA)在外界辐射热流密度条件下的热解过程进行数值模型的构建,研究表面吸收和深度吸收这两种文献中用的较多且相对极端的吸收方式对材料热解过程的影响.该数学模型对锥型量热仪氮气气氛下材料热解实验过程进行模拟,包括质量损失速率、材料内部温度分布、表面和背面温度.通过与已经发表的相应实验数据对比,对模型的可靠性进行验证.结果表明,不同的吸收模式对热解细节有较大的影响,如材料内部温度分布、表面温度和热解开始时间等.在预测实验尺寸条件下的热解过程时,两种吸收模式的模拟结果均在可接受范围之内.

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