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首页> 外文期刊>Journal of Heat Transfer >Melting of Phase Change Materials With Volume Change in Metal Foams
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Melting of Phase Change Materials With Volume Change in Metal Foams

机译：金属泡沫的体积变化引起相变材料的熔化

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摘要

Melting of phase change materials (PCMs) embedded in metal foams is investigated. The two-temperature model developed accounts for volume change in the PCM upon melting. Volume-averaged mass and momentum equations are solved, with the Brinkman-Forchheimer extension to Darcy's law employed to model the porous-medium resistance. Local thermal equilibrium does not hold due to the large difference in thermal diffusivity between the metal foam and the PCM. Therefore, a two-temperature approach is adopted, with the heat transfer between the metal foam and the PCM being coupled by means of an interstitial Nusselt number. The enthalpy method is applied to account for phase change. The governing equations are solved using a finite-volume approach. Effects of volume shrinkage/expansion are considered for different interstitial heat transfer rates between the foam and PCM. The detailed behavior of the melting region as a function of buoyancy-driven convection and interstitial Nusselt number is analyzed. For strong interstitial heat transfer, the melting region is significantly reduced in extent and the melting process is greatly enhanced as is heat transfer from the wall; the converse applies for weak interstitial heat transfer. The melting process at a low interstitial Nusselt number is significantly influenced by melt convection, while the behavior is dominated by conduction at high interstitial Nusselt numbers. Volume shrinkage/expansion due to phase change induces an added flow, which affects the PCM melting rate.
机译：研究了嵌入金属泡沫中的相变材料（PCM）的熔化。建立的两温模型说明了熔化后PCM中的体积变化。使用Brinkman-Forchheimer对达西定律的扩展对体积平均质量和动量方程进行求解，以模拟多孔介质的阻力。由于金属泡沫和PCM之间的热扩散率差异较大，因此无法保持局部热平衡。因此，采用了两种温度的方法，其中金属泡沫与PCM之间的传热通过间隙Nusselt数耦合。焓法用于解决相变。控制方程使用有限体积法求解。对于泡沫和PCM之间的不同间隙传热速率，考虑了体积收缩/膨胀的影响。分析了熔化区域作为浮力驱动对流和间隙Nusselt值的函数的详细行为。对于强烈的间隙传热，熔化区域的范围会大大缩小，熔化过程会大大增强，而壁的传热也是如此。反之则适用于较弱的间隙传热。低间隙Nusselt数下的熔化过程受熔体对流的影响很大，而行为在高间隙Nusselt数下的传导占主导。由于相变引起的体积收缩/膨胀会引起流动增加，从而影响PCM的熔化速率。

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