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首页> 外文期刊>Journal of Heat Transfer >Local Thermal Nonequilibrium During Melting of a Paraffin Filled in an Open-Cell Copper Foam: A Visualized Study at the Pore-Scale
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Local Thermal Nonequilibrium During Melting of a Paraffin Filled in an Open-Cell Copper Foam: A Visualized Study at the Pore-Scale

机译：石蜡在开孔铜泡沫中填充过程中的局部热非平衡：在孔隙规模的可视化研究。

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摘要

In this technical brief, the application of infrared thermal imaging to investigate melting of a phase-change material (PCM) filled in an open-cell metal foam was proposed. Melting experiments in a rectangular cell were performed with paraffin/copper foam composite samples having a single pore size of 15 ppi. The visualized study at the pore-scale was enabled using an infrared video camera equipped with a macrolens, offering a resolution of 50 μm. The transient thermal imaging results were first validated against the temperature readings by a pre-installed thermocouple. A relative deviation below 4% was observed between the two methods over the entire course of melting. The local thermal nonequilibrium between a copper ligament and its surrounding paraffin was found to become more pronounced as melting proceeds, which could reach up to the order of 10°C during the late stage of melting. The quantitative observation of the local thermal nonequilibrium effect may facilitate improvement of the existing two-temperature models for numerical simulations on melting of PCM enhanced by embedding metal foams.
机译：在本技术简介中，提出了将红外热成像技术用于研究填充在开孔金属泡沫中的相变材料（PCM）熔化的应用。使用单孔尺寸为15 ppi的石蜡/铜泡沫复合材料样品在矩形单元中进行熔融实验。使用配备了可提供50μm分辨率的微距镜头的红外摄像机实现了在孔径尺度上的可视化研究。瞬态热成像结果首先通过预安装的热电偶针对温度读数进行验证。在整个熔化过程中，两种方法之间的相对偏差低于4％。随着熔化的进行，发现铜韧带与其周围的石蜡之间的局部热不平衡变得更加明显，在熔化的后期可能达到10°C左右。对局部热非平衡效应的定量观察可能有助于改进现有的两个温度模型，以对通过嵌入金属泡沫而增强的PCM的数值模拟进行数值模拟。

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