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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of foam geometry on heat absorption characteristics of PCM-metal foam composite thermal energy storage systems
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Effect of foam geometry on heat absorption characteristics of PCM-metal foam composite thermal energy storage systems

机译：泡沫几何形状对PCM-金属泡沫复合储热系统吸热特性的影响

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摘要

This paper presents a numerical study of the energy absorption characteristics of phase change material (PCM) based energy storage systems enhanced with metal foam structure. In particular, the effect of metal foam geometry on total energy absorption and melting of PCM is analyzed. A generalized geometry creation model is developed to create the foam geometry by using random distribution of overlapping spheres of constant or variable sizes. Different foam geometries are created by varying parameters such as pore radius, pore overlap distance and overall porosity. The main feature of the model is that instead of considering volume-averaged PCM-metal foam composite structure, individual pores of the metal foam are resolved, thus leading to more accurate representation of the heat transfer between the PCM and metal foam.The model is coupled with an enthalpy-based phase change model to simulate the effect of high temperature boundary condition on melting and heat absorption. Parametric studies reveal that smaller pore size is always preferable irrespective of the heat transfer duration. However, the optimum overlap and porosity is dependent on the heat transfer duration. Thus for developing an optimized system, these parameters should be judiciously selected based on the transient characteristics of the overall system. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文提供了基于泡沫金属增强的基于相变材料（PCM）的储能系统的能量吸收特性的数值研究。特别是，分析了金属泡沫几何形状对PCM的总能量吸收和熔化的影响。通过使用恒定或可变大小的重叠球体的随机分布，开发了通用的几何图形创建模型以创建泡沫几何图形。通过改变诸如孔半径，孔重叠距离和总孔隙率的参数来产生不同的泡沫几何形状。该模型的主要特征是，无需考虑体积平均的PCM-金属泡沫复合结构，而是解决了金属泡沫的单个孔，从而可以更精确地表示PCM与金属泡沫之间的传热关系。结合基于焓的相变模型来模拟高温边界条件对熔化和吸热的影响。参数研究表明，与传热持续时间无关，始终优选较小的孔径。但是，最佳的重叠度和孔隙率取决于传热时间。因此，为了开发优化的系统，应基于整个系统的瞬态特性明智地选择这些参数。 （C）2019 Elsevier Ltd.保留所有权利。

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