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首页> 外文期刊>Journal of Materials Science >Flow through an evolving porous media-compressed foam
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Flow through an evolving porous media-compressed foam

机译：流经不断发展的多孔介质压缩泡沫

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Magnetic Resonance Imaging (MRI) techniques were applied such that they were able to provide simultaneously both 3D pore-scale velocity and microstructural data for polyurethane foam with water flowing through it. This necessitated the use of velocity gating of the relevant images in order to describe accurately the position of the solid foam walls; a pore thinning algorithm was used to differentiate individual pores within the foam pore space where minima in hydraulic radius defined pore boundaries. This methodology was then used to explore the effect of foam compression on both pore geometric characteristics and pore-scale velocity fields. Pore volumes were seen to decrease from 3.27 to 0.96 mm(3) as porosity was reduced from 0.84 to 0.61 and increased flow channelling, adjacent to the containing cylinder, was observed. The velocity fields were compared with corresponding Lattice Boltzmann flow simulations with good agreement being produced.
机译：应用了磁共振成像（MRI）技术，使它们能够同时提供聚氨酯泡沫和3D孔速以及微观结构数据。为了准确地描述固体泡沫壁的位置，必须使用相关图像的速度门控。孔隙稀疏算法用于区分泡沫孔隙空间中的各个孔隙，其中液压半径的最小值定义了孔隙边界。然后，使用该方法来研究泡沫压缩对孔隙几何特征和孔隙尺度速度场的影响。当孔隙率从0.84降低到0.61并观察到与容纳圆柱体相邻的流动通道增加时，孔隙体积从3.27减少至0.96 mm（3）。将速度场与相应的Lattice Boltzmann流动模拟进行了比较，得出了很好的一致性。

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