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首页> 外文期刊>International Journal of Heat and Fluid Flow >Simulations of flow through open cell metal foams using an idealized periodic cell structure
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Simulations of flow through open cell metal foams using an idealized periodic cell structure

机译：使用理想化的周期性泡孔结构模拟流过开孔金属泡沫的流动

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摘要

A new approach to modeling the flow through a porous medium with a well defined structure is presented. This approach entailed modeling an idealized open cell metal foam based on a fundamental periodic unit of eight cells and solving the flow through the three-dimensional cellular unit. To model an infinitely large matrix, periodic boundary conditions were set on the walls parallel to the flow direction, while a pseudo-periodic boundary condition with a prescribed volumetric flow rate was set over the inlet-outlet pair of the unit cell. The pressure drop data of the flow through the cellular unit were then compared on a length-normalized basis against experimental data. The pressure drop values predicted by the simulations were consistently 25% lower than the values obtained in the experiments on a similar foam and under identical flow conditions. One explanation for the discrepancy between the two sets of data is the lack of pressure drop increasing wall effects in the simulations. The increase in the pressure drop from wall effects in the simulation was quantified.
机译：提出了一种对具有良好定义的结构的多孔介质的流动进行建模的新方法。这种方法需要基于八个孔的基本周期性单位对理想化的开孔金属泡沫进行建模，并求解通过三维孔单元的流动。为了模拟无限大的矩阵，在平行于流动方向的壁上设置了周期性边界条件，而在单元格的进出口对上设置了具有规定体积流量的拟周期边界条件。然后，在长度归一化的基础上，将通过细胞单元的流体的压降数据与实验数据进行比较。通过模拟预测的压降值始终比在类似泡沫和相同流动条件下的实验中获得的值低25％。两组数据之间差异的一种解释是，在模拟中缺少压力下降会增加壁效应。量化了模拟中壁效应引起的压降增加。

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