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首页> 外文期刊>International Journal of Heat and Mass Transfer >Anisotropic convective heat transfer in open-cell metal foams: Assessment and correlations
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Anisotropic convective heat transfer in open-cell metal foams: Assessment and correlations

机译：开放式电池金属泡沫中的各向异性对流热传递：评估和相关性

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摘要

Open-cell metal foams are promising materials for heat transfer augmentation, due to their tortuosity and high specific surface area. The volume-averaging technique under the assumption of local thermal non-equilibrium between the solid and fluid phases is often used to model devices equipped with open-cell foams; it requires an accurate knowledge of the interfacial convective heat transfer coefficient. Its dependence on the anisotropy of elongated foam cells is investigated numerically in the present work. Four aluminum foam samples with different porosities and equal PPIs are considered; their geometry is reconstructed by means of x-ray computed tomography. Mass, momentum and energy equations for the fluid phase (air) are solved, while the solid phase is accounted for with a uniform heat flux boundary condition. Interfacial convective heat transfer coefficients and Nusselt numbers are predicted. The dependence of the interfacial heat transfer coefficient in the elongation direction on the effective porosity and fluid inlet velocity is pointed out. The comparison of predicted values with those given by correlations from the open literature shows a good agreement. Finally, correlations for the prediction of Nusselt numbers, accounting for the foam anisotropy, are proposed, which can be useful in the study of metal foams.
机译：由于曲折性和高比表面积，开放式电池金属泡沫是用于传热增强的有希望的材料。在固体和流体阶段之间的局部热非平衡假设下的体积平均技术通常用于模拟配备有开孔泡沫的装置;它需要准确地了解界面对流传热系数。在本工作中数量地研究其对细长泡沫细胞的各向异性的依赖性。考虑了四种具有不同孔隙和平等的PPI的铝泡沫样品;通过X射线计算机断层扫描重建它们的几何形状。求解流体相（空气）的质量，动量和能量方程，而固相对于具有均匀的热通量边界条件。预测界面对流传热系数和纽带数。指出了伸长方向上伸长方向上的界面传热系数对有效孔隙率和流体入口速度的依赖性。通过开放文献相关的预测值与来自开放文献相关的人的比较显示了良好的一致性。最后，提出了提出对泡沫各向异性核对泡沫各向异性的讨论的相关性的相关性，这可用于金属泡沫的研究。

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