A generic local thermal equilibrium model for porous reactive materials submitted to high temperatures
A generic local thermal equilibrium model for porous reactive materials submitted to high temperatures
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DOI：
10.1016/j.ijheatmasstransfer.2016.11.067
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发表时间：
2017-05
影响因子：
5.2
通讯作者：
J. Lachaud;J. Scoggins;T. Magin;M. G. Meyer;N. Mansour
中科院分区：
文献类型：
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作者：
J. Lachaud;J. Scoggins;T. Magin;M. G. Meyer;N. Mansour
许多工程应用涉及将多孔材料置于高温下进行反应。这项工作提出了一个详细而实用的多孔材料的传热传质模型，该模型包含多个固相和一个气相。在假设局部热平衡的条件下，在孔尺度上模拟了气固两相之间发生的详细的化学作用。得到了固相热解、气相热解物种注入、固相与气相非均相反应、气相均相反应的均化模型。化学模型被集成在宏观模型中，利用体积平均控制方程来守恒固体质量、气体质量、物种(有限速率化学)或元素(平衡化学)、动量和能量。该模型已在美国宇航局开发的基于OpenFoam的多孔材料分析工具箱(PATO)中实现。给出了它在两个高温工程问题中的应用。第一个应用涉及到空间飞行器的隔热设计。第二个项目旨在提高对生物质热解生产生物碳氢化合物的认识。
Many engineering applications involve reacting porous materials submitted to high temperatures. This work presents a detailed but pragmatic heat and mass transfer model for porous materials containing several solid phases and a single gas phase. The detailed chemical interactions occurring between the solid phases and the gas phase are modeled at the pore scale assuming local thermal equilibrium. Homogenized models are obtained for solid pyrolysis, pyrolysis species injection in the gas phase, heterogeneous reactions between the solid phases and the gas phase, and homogeneous reactions in the gas phase. The chemistry models are integrated in a macroscopic model making use of volume-averaged governing equations for the conservation of solid mass, gas mass, species (finite-rate chemistry) or elements (equilibrium chemistry), momentum, and energy. The model has been implemented in the Porous Material Analysis Toolbox based on OpenFoam (PATO), distributed Open Source by NASA. Applications to two high-temperature engineering problems are presented. The first application concerns the design of heat-shields of space vehicles. The second one aims at improving the understanding of biomass pyrolysis for the production of biohydrocarbons.