Melting Processes of Phase Change Material in Sidewall-Heated Cavity

IF 1.1 4区 工程技术 Q4 ENGINEERING, MECHANICAL
Y. Li, G. Su
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引用次数: 0

Abstract

Melting processes of phase change material (PCM) confined in a rectangular cavity with an isothermal vertical wall are investigated to quantify the transition criterion between different melting regimes. A series of numerical simulations are conducted via the phase-change lattice Boltzmann method, and the results show that the temperature field in the liquid PCM region changes from the structure with two thermal boundary layers to the structure with two thermal boundary layers plus a convection region. Moreover, the results also indicate that the heat transfer mechanism undergoes a transition from conduction to convection when the relative thickness between the convention region and the thermal boundary reaches a critical value. This value (transition criterion) can be quantified by the critical melted volume fraction, and its dependence on Rayleigh number, Prandtl number, and aspect ratio of cavity is theoretically derived in this study. Then, based on the transition criterion, a piecewise correlation of melted volume fraction is proposed, which considers the effect of different melting regimes and is proven to predict the literature’s result.
相变材料在侧壁加热腔内的熔化过程
研究了相变材料(PCM)在等温垂直壁矩形腔内的熔化过程,量化了不同熔化状态之间的过渡准则。采用相变晶格玻尔兹曼方法进行了一系列数值模拟,结果表明,液体PCM区域的温度场由双热边界层结构转变为双热边界层加对流区结构。此外,研究结果还表明,当常规区与热边界之间的相对厚度达到临界值时,传热机制经历了从传导到对流的过渡。该值(过渡准则)可用临界熔体体积分数来量化,并从理论上推导了临界熔体体积分数与瑞利数、普朗特数和空腔长径比的关系。然后,在过渡准则的基础上,提出了熔体体积分数的分段相关性,该相关性考虑了不同熔点的影响,并被证明可以预测文献的结果。
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来源期刊
Journal of Thermophysics and Heat Transfer
Journal of Thermophysics and Heat Transfer 工程技术-工程:机械
CiteScore
3.50
自引率
19.00%
发文量
95
审稿时长
3 months
期刊介绍: This Journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. The Journal publishes qualified papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include aerothermodynamics; conductive, convective, radiative, and multiphase modes of heat transfer; micro- and nano-scale heat transfer; nonintrusive diagnostics; numerical and experimental techniques; plasma excitation and flow interactions; thermal systems; and thermophysical properties. Papers that review recent research developments in any of the prior topics are also solicited.
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