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Natural convection heat transfer in a rectangular enclosure with suspensions of microencapsulated phase change materials: A parametric study.

机译：矩形外壳中自然对流传热，带有微胶囊相变材料的悬浮液：一项参数研究。

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摘要

The present work investigates the heat transfer enhancing capability of phase change slurries in natural convection, in rectangular enclosures heated from below. The working fluid used, was a suspension of phase change microcapsules. The vertical walls of the test section are insulated, the lower horizontal wall is a constant heat flux surface and the upper wall is isothermal. The work quantifies the heat transfer rate in parameter ranges hitherto not investigated (DeltaRa∼104 and DeltaSte∼10 2).; The results indicate a significant potential for enhancing the heat transfer rate using phase change slurries. Heat transfer rates increased by as much as 110% with low concentration slurries. The enhancement in heat transfer is strongly influenced by the conductivity ratio of the two phases, the quality of the suspension and the Rayleigh number range. Analysis also reveals that less than 3% of the total phase change material in the slurry at any time actually melted. Idealized estimates indicate that even in the best designed slurries, the very design of the phase change slurry ensures that approximately half the phase change material in a capsule cannot be utilized. Correlations quantifying the Nu variation with Ra and Ste have been developed.
机译：本工作研究了从下方加热的矩形外壳中自然对流中相变浆料的传热增强能力。所使用的工作流体是相变微胶囊的悬浮液。测试部分的垂直壁是绝缘的，下部水平壁是恒定的热通量表面，而上部壁是等温的。这项工作量化了迄今未研究的参数范围内的传热速率（DeltaRa〜104和DeltaSte〜10 2）。结果表明，使用相变浆料可以提高传热速率。在低浓度浆液中，传热率提高了110％。传热的增强在很大程度上受到两相电导率，悬浮液质量和瑞利数范围的影响。分析还显示，在任何时候，浆料中总相变材料中只有不到3％实际熔化。理想的估计值表明，即使在最佳设计的浆料中，相变浆料的独特设计也可确保胶囊中约一半的相变材料无法利用。已经开发出定量分析与Ra和Ste相关的Nu变化的相关性。

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