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Title: Regulating Melting Process in the Energy Storage of Solid-Liquid PCM based on Double MRT-LBM Simulation
题目：基于双MRT-LBM模拟的固液PCM储能中熔融过程的调节
Authors: CHEN Weiqi, SONG Zhichao, QUAN Dongliang, HE Yurong
作者：陈维奇，宋志超，全栋梁，何玉荣
单位：哈尔滨工业大学,黑龙江省新型储能材料与工艺重点实验室,哈尔滨工业大学郑州研究院,航天三院创新研究院
Journal of Thermal Science, 2024, 33(5): 1688-1700.
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摘要
Abstract:The melting process of solid-liquid phase change materials (PCM) has a significant impact on their energy storage performance. To more effectively apply solid-liquid PCM for energy storage, it is crucial to study the regulation of melting process of solid-liquid PCM, which is numerically investigated based on double multiple relaxation time lattice Boltzmann method (MRT-LBM) in this work. In this work we pay more attention to the effects of different Stefan numbers (Ste) and Rayleigh numbers (Ra) on the melting process. The results indicate that the PCM melting is greatly influenced by the Ste number and Ra number, which can be divided into the heat conduction dominant stage and the convection dominant stage, according to the onset time of convection FoC. In order to describe the contribution of the heat conduction dominant stage to the whole melting process quantitatively, we firstly propose the ratio of the heat conduction dominant stage Rpc, which can be defined as the ratio of FoC to the complete melting time FoM. Rpc gradually decreases as the Ra number increases, and when the Ste number rises: Rpc=90.0% when Ste=1.0 and Ra=1×105, Rpc=39.6% when Ste=0.1 and Ra=1×105, and Rpc=14.0% when Ste=1.0 and Ra=1×107. A regime map about the effects of different Ste numbers and Ra numbers on Rpc has been further summarized. The discovered findings would be helpful in regulating melting process in the energy storage of solid-liquid PCM.
摘要：固液相变材料的熔化过程对其储能性能有着重要影响。为更有效地将固-液相变材料应用于储能，本工作基于多松弛时间格子玻尔兹曼方法（MRT-LBM）对固-液PCM的熔化过程进行了数值模拟，重点研究了不同Stefan数（Ste）和Rayleigh数（Ra）对熔化过程的影响。结果表明，相变材料的熔化受Ste数和Ra数的影响很大，根据对流起始时间FoC，可将熔化过程分为传热主导阶段和对流主导阶段。为了定量描述传热主导阶段对整个熔化过程的贡献，定义FoC与完全熔化时间FoM的比值为传热主导阶段占比Rpc。发现Rpc随着Ra数的增加而降低，随着Ste数增加而增加：当Ste=1.0、Ra=1×105时，Rpc=90.0%，当Ste=0.1、Ra=1×105时，Rpc=39.6%；当Ste=1.0、Ra=1×107时，Rpc=14.0%。本工作进一步总结了不同Ste数和Ra数对Rpc影响的相图。这一发现将有助于调节固液相变材料储能过程中的熔化过程。
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引用格式
CHEN Weiqi, SONG Zhichao, QUAN Dongliang, HE Yurong, Regulating Melting Process in the Energy Storage of Solid-Liquid PCM based on Double MRT-LBM Simulation, Journal of Thermal Science, 2024, 33(5): 1688-1700.
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