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Critical analysis of the experimental determination of the thermal resistance of metal foams

机译:决定性分析金属泡沫热阻的关键分析

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This paper addresses experimental and numerical analysis of the thermal resistance of M-Pore~® copper foam. The findings suggest a separation of the thermal resistance into two components: material resistance and contact resistance. Finite element analysis is used to calculate the thermal material resistance. Calculation models are based on micro-computed tomography data in order to account for the complex material geometry. The same samples are used for experimental analysis. A transient method is applied where a time-dependent temperature change is related to the thermal resistance. In addition to material resistance, experimental measurement values inevitably include thermal contact resistance. Although a thermally conducting paste is used in order to minimise this effect, a significant thermal contact resistance is found. As a result, the experimentally measured thermal resistance can no longer be considered as a material property but depends on the sample size and the particular shape of the contact surfaces. Furthermore, it is demonstrated that the traditional approach to experimentally obtain thermal contact resistance by changing the specimen size is impractical for cellular metals. Instead, the contact resistance is obtained by comparing experimental and numerical results.
机译:本文介绍了M-Pore〜®泡沫铜热阻的实验和数值分析。研究结果表明,热阻分为两个部分:材料电阻和接触电阻。有限元分析用于计算材料的热阻。计算模型基于微型计算机断层扫描数据,以考虑复杂的材料几何形状。相同的样品用于实验分析。在与时间相关的温度变化与热阻相关的情况下,采用瞬态方法。除材料电阻外,实验测量值不可避免地包括热接触电阻。尽管使用导热膏以最小化该影响,但是发现显着的热接触电阻。结果,实验测量的热阻不再被视为材料性能,而是取决于样品大小和接触表面的特定形状。此外,已经证明,通过改变样品尺寸来通过实验获得热接触电阻的传统方法对于多孔金属是不切实际的。而是通过比较实验和数值结果获得接触电阻。

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