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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal conductivity of highly porous metal foams: Experimental and image based finite element analysis
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Thermal conductivity of highly porous metal foams: Experimental and image based finite element analysis

机译：高孔隙率金属泡沫的导热系数：基于实验和图像的有限元分析

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摘要

X-ray tomography is used to produce three-dimensional images of an aluminium alloy foam with a high porosity (>93%). These data allow describing the foam structure from which a finite element model is derived to predict the thermal conductivity of the foam. The results are compared with experimental values measured by a new guarded hot plate apparatus adapted for the range of thermal conductivity values of interest. Good agreement is observed which validated the finite element model used to evaluate the thermal properties of any porous metallic foam with stochastic cell size and configuration. Furthermore, the thermal conductivity of the foam has also been predicted using previous analytical models. The differences with previous values show that it is important to account for the real geometry of the foam to get an accurate value of the thermal conductivity.
机译：X射线断层扫描用于产生高孔隙率（> 93％）的铝合金泡沫的三维图像。这些数据允许描述泡沫结构，从中可以导出有限元模型来预测泡沫的热导率。将结果与适用于感兴趣的导热率范围的新型防护热板设备测得的实验值进行比较。观察到良好的一致性，这验证了用于评估具有随机孔尺寸和构造的任何多孔金属泡沫的热性能的有限元模型。此外，还已经使用先前的分析模型预测了泡沫的热导率。与先前值的差异表明，重要的是要考虑泡沫的真实几何形状以获得准确的热导率值。

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