Due to their high thermal conductivity, open-cellular metal foams are frequently used to improve the thermal conductivity of phase change materials. In this paper, the effective thermal conductivity of open-cellular foam filled with PCM with cubic units containing 12 solid tubular ribs was determined using an effective medium theory for composites. It was shown that metal foams with a large ratio of the radius of the tubular rib to its length can reach higher thermal conductivity. The case was also analyzed when the surface of the foam ribs was covered with a thin layer of another metal with high thermal conductivity. The results predicted by the proposed model were compared with the theoretical results of other models and with experimental data for some metal foam filled with phase change materials. A good agreement was achieved between present model predictions and experimental data.

中文翻译：

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具有开孔金属泡沫的复合相变材料的有效热导率

由于其高导热性，开孔金属泡沫经常被用于提高相变材料的导热性。在本文中，使用复合材料的有效介质理论确定了填充有包含 12 个实心管状肋的立方单元的 PCM 的开孔泡沫的有效热导率。结果表明，管状肋半径与其长度之比大的金属泡沫可以达到更高的热导率。当泡沫肋的表面覆盖有另一种具有高导热性的金属薄层时，也对这种情况进行了分析。将所提出的模型预测的结果与其他模型的理论结果以及一些填充有相变材料的金属泡沫的实验数据进行了比较。