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Lattice Boltzmann investigation on phase change of nanoparticle-enhanced phase change material in a cavity with separate plate

机译：格子Boltzmann研究具有分离板的腔中纳米增强相变材料的相变

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摘要

The phase change material (PCM) can be used in thermal energy storage (TES) with large latent heat. However, due to the heat accumulation in the upper region, the solid-liquid phase change process will be slowed down. In this paper, in order to enhance the heat transfer of nanoparticle-enhanced PCM (NEPCM) in TES, a separate plate is applied to weaken the heat accumulation. The phase change multiple-relaxation-times lattice Boltzmann (MRT-LB) model is employed to solve the numerical problem and the effects of separate plate location, nano particle volume fraction and Rayleigh number are investigated. The results show that for all the Rayleigh numbers and volume fractions, the NEPCM of the case that separate plate is located in the middle of cavity melts fastest. Furthermore, the separate plate can reduce the temperature standard deviation. However, when the location of separate plate is less than 0.3, the melting process is slowed down, resulted from the heat accumulation near the separate plate.
机译：相变材料（PCM）可用于潜热较大的热能存储（TES）。然而，由于在上部区域中的热量累积，固液相变过程将减慢。在本文中，为了增强TES中纳米颗粒增强PCM（NEPCM）的热传递，应用了一块单独的板来减弱热量的积聚。利用相变倍弛豫时间格子玻尔兹曼模型（MRT-LB）解决了数值问题，研究了分离板位置，纳米颗粒体积分数和瑞利数的影响。结果表明，对于所有瑞利数和体积分数，分离板位于型腔中间的情况的NEPCM熔化最快。此外，单独的板可以减小温度标准偏差。但是，当分隔板的位置小于0.3时，由于分隔板附近的热量积聚而导致熔化过程变慢。

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