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PERMEABILITY AND THERMAL TRANSPORT IN COMPRESSED OPEN-CELLED FOAMS

机译:压缩开孔泡沫的渗透性和热传递

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摘要

A computational methodology is proposed to describe the fluid transport in compressed open-celled metallic foams. Various unit-cell foam geometries are numerically deformed under uniaxial loads using a finite-element method. An algorithm is developed and implemented to deform the fluid domain mesh inside the unit-cell foam based on the deformed solid unit-cell geometry. Direct simulations of the fluid transport in these deformed meshes are then performed over a range of Reynolds numbers used in practical applications. The model is validated against available experimental results and correlations. A corrected model is proposed for the permeability of compressed foams as a function of strain for flows transverse to the direction of compression. The thermal conductivity of fluid-saturated foams is also computed. Compression of foams increases the conductivity transverse to the direction of compression and decreases the conductivity parallel to it.
机译:提出了一种计算方法来描述压缩的开孔金属泡沫中的流体传输。使用有限元方法,在单轴载荷下,各种单元泡沫的几何形状会发生数值变形。开发并实施了一种算法,用于基于变形的实体晶胞几何形状使晶胞泡沫内的流体域网格变形。然后,在实际应用中使用的雷诺数范围内,对这些变形的网格中的流体传输进行直接模拟。针对可用的实验结果和相关性对模型进行了验证。针对压缩泡沫的渗透率,作为横向于压缩方向的流动的应变的函数,提出了一种校正模型。还计算了流体饱和泡沫的热导率。泡沫的压缩增加了横向于压缩方向的电导率,并降低了与压缩方向平行的电导率。

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