Semi-theoretical correlations of melting process driven by Rayleigh–Bénard convection suitable for low melting point metal
Semi-theoretical correlations of melting process driven by Rayleigh–Bénard convection suitable for low melting point metal
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DOI：
10.1016/j.csite.2021.101511
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发表时间：
2021-12
影响因子：
6.8
通讯作者：
Wenhua Guo;Rijing Zhao;Yi Liu;Dong Huang
中科院分区：
文献类型：
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作者：
Wenhua Guo;Rijing Zhao;Yi Liu;Dong Huang
本文研究了低熔点金属 (LMPM) 在瑞利-贝纳德对流存在下从底部加热的方形腔中的熔化过程。现有研究主要集中在高PrPCM熔化过程上，低PrPCM熔化过程与高PrPCM熔化过程之间的差异有待研究。应用尺度分析和数值研究来分析低PrLMPM熔化过程。尺度分析试图研究LMPM熔化速率并获得液体分数和Nu与Fo、Pr、Ras和Ste的基本理论关系。建立了数值模型来阐述低 PrLMPM 的动态熔化传热特性。数值结果表明，与高PrPCM不同，低PrLMPM的流动池形貌呈现明显变化，完全熔化所需的时间更短，平均热通量更高。瑞利-贝纳德对流在对流主导区引起Nu的振荡，平均Nufor LMPM从5.11增加到13.77，Ra从5.0×105增加到1.25×107。最后，通过尺度分析和数值研究建立了液体分数和Nu的半理论相关式，并对其准确性进行了数值验证。
This paper studies the melting process of low melting point metal (LMPM) in a square cavity heated from bottom in the presence of Rayleigh–Bénard convection. Existing research focuses on high–PrPCM melting process, and the difference between low and high-PrPCM melting process needs to study. Scale analysis and numerical investigation are applied to analyze low-PrLMPM melting process. Scale analysis tries to research the LMPM melting rate and obtain basic theoretical relationships of liquid fraction andNuwithFo,Pr,RasandSte. A numerical model is established to elaborate dynamic melting heat transfer characteristics of low–PrLMPM. The numerical results show that different from high-PrPCM, the flow cell morphology presents obvious changes for low-PrLMPM, and the time needed to completely melt is much shorter and the average heat flux is higher. The Rayleigh–Bénard convection causes oscillation ofNuin the convection dominated regime, and the averageNufor LMPM increases from 5.11 to 13.77 with theRafrom 5.0×105to 1.25×107. Finally, the semi-theoretical correlations for liquid fraction andNuare developed by scale analysis and numerical investigation, and the accuracy is numerically validated.