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POPULATION BALANCE MODELING OF MELT EVOLUTION AND IGNITION OF HIGH-DENSITY POLYETHYLENE

机译:高密度聚乙烯熔体演化与点火的种群平衡模型

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摘要

High-density polyethylene (HDPE) is a commonly used polymeric material. Flammabilityrnproperties of this material and chemio-physical treatments to reduce its flammability are of interest.rnModeling and simulation serves a role in characterizing polymer flammability. In this paper, we showrnthat population balance equations (PBEs) can be used to model the evolution of thermoplasticsrnundergoing pyrolysis and improve the modeling of the condensed phase physics in fire phenomena.rnAs a demonstration of this, a PBE is used to model the piloted ignition of HDPE. The pyrolysisrnchemistry is modeled by a two-step oxidation mechanism. Mass transfer is modeled by diffusion.rnSince the condensed phase involves a large number of species, the dimensionality of the chemicalrncomposition vector is reduced by taking moments over the large end of the species numberrndistribution function. The model is then used to predict mass flux history, ignition time, and ignitionrntemperature in a typical piloted ignition experiment. Melt molecular weight is also computed as thisrnhas a significant influence on a material’s tendency to drip.
机译:高密度聚乙烯(HDPE)是一种常用的聚合材料。这种材料的可燃性-以及降低其可燃性的化学物理处理是令人关注的。建模和模拟在表征聚合物可燃性中起着重要作用。在本文中,我们证明了可以使用人口平衡方程(PBE)来模拟热塑性塑料的热解过程,并改善着火现象中的凝聚相物理模型。 HDPE。通过两步氧化机理对热解化学进行建模。由于传质是通过扩散进行建模的。由于凝聚相涉及大量的物种,因此,通过在物种数量分布函数的大端上施加矩来降低化学成分矢量的维数。然后,在典型的引燃实验中,使用该模型预测质量通量历史,点火时间和点火温度。熔融分子量也可以计算出来,因为这对材料的滴落趋势有重大影响。

著录项

  • 来源
    《Fire and Materials 2013》|2013年|389-400|共12页
  • 会议地点 San Francisco CA(US);London(GB)
  • 作者单位

    National Institute of Standards and Technology, USA;

    rnThe University of Texas at Austin, USA;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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