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Modeling phase change material in micro-foam under constant temperature condition

机译:在恒温条件下在微泡中模拟相变材料

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Heat transfer of phase change material(PCM)in an open cell micro-foam structure was numerically studied. A high constant temperature was specified at the top surface of the structure. Each unit of the micro-foam is a body-centered-cubic(BCC)lattice embedded with spherical micro-pores. Two different simulation methodologies were applied. One is the high-fidelity direct numerical simulation(DNS), which allows for the effective thermo-physical parameters to be derived. The other methodology is a volume-averaged simulation based on one- and two-temperature models. Our results show that the volume-averaged simulation can accurately and efficiently capture the phase change process in PCM/micro-foam systems, with the effective thermal conductivity derived from direct simulations and expressed as a power law of porosity.
机译:对开孔微泡沫结构中相变材料(PCM)的传热进行了数值研究。在结构的顶面指定了较高的恒定温度。微泡沫的每个单元都是嵌入有球形微孔的体心立方(BCC)晶格。应用了两种不同的仿真方法。一种是高保真直接数值模拟(DNS),它可以导出有效的热物理参数。另一种方法是基于一个和两个温度模型的体积平均模拟。我们的结果表明,体积平均模拟可以准确有效地捕获PCM /微泡沫系统中的相变过程,其有效导热系数可直接进行模拟,并表示为孔隙度的幂律。

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