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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation of pressure drop and heat transfer through reconstructed metal foams and comparison against experiments
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Numerical investigation of pressure drop and heat transfer through reconstructed metal foams and comparison against experiments

机译：重构金属泡沫的压降和传热数值研究及与实验的比较

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Direct numerical simulation of transport in foam materials can benefit from realistic representations of the porous-medium geometry generated by employing non-destructive 3D imaging techniques. X-ray micro-tomography employs computer-processed X-rays to produce tomographic images or slices of specific regions of the object under investigation, and is ideally suited for imaging opaque and intricate porous media. In this work, we employ micro-CT for numerical analysis of air flow and convection through four different high-porosity copper foams. All four foam samples exhibit approximately the same relative density (6.4-6.6% solid volume fraction), but have different pore densities (5,10,20, and 40 pores per inch, PPI). A commercial micro-computed tomography scanner is employed for scanning the 3D microstructure of the foams at a resolution of 20 urn, yielding stacks of two-dimensional images. These images are processed in order to reconstruct and mesh the real, random structure of the foams, upon which simulations are conducted of forced convection through the pore spaces of the foam samples. The pressure drop values from this μCT based CFD analysis are compared against prior experimental results; the computational interfacial heat transfer results are compared against the values predicted by an empirical correlation previously reported, revealing excellent agreement between the numerical and experimental/empirical hydraulic and thermal results, thus highlighting the efficacy of this novel approach.
机译：泡沫材料中运输的直接数值模拟可以受益于通过采用非破坏性3D成像技术生成的多孔介质几何形状的真实表示。 X射线显微断层摄影采用计算机处理的X射线产生断层摄影图像或所研究对象的特定区域的切片，非常适合对不透明和复杂的多孔介质进行成像。在这项工作中，我们采用micro-CT对通过四种不同的高孔隙率铜泡沫进行的空气流动和对流进行数值分析。所有四个泡沫样品均表现出大约相同的相对密度（6.4-6.6％固体体积分数），但具有不同的孔密度（每英寸5、10、20和40个孔，PPI）。使用商业化的微型计算机断层扫描仪，以20微米的分辨率扫描泡沫的3D微观结构，从而产生二维图像堆栈。对这些图像进行处理以重建泡沫并对其进行网格划分，然后对泡沫样品的孔隙进行强制对流的模拟。将基于μCT的CFD分析得出的压降值与先前的实验结果进行比较；计算的界面传热结果与先前报道的经验相关性预测的值进行了比较，揭示了数值与实验/经验的水力和热力结果之间的出色一致性，从而突出了这种新方法的有效性。

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