An Experimental Investigation of Constrained Melting Heat Transfer of Nano-Enhanced Phase Change Materials in a Horizontal Cylindrical Capsule Using Thermochromic Liquid Crystal Thermography

Nan Hu; Zi-Rui Li; Run-Hui Zhang; Jia Liu; Li-Wu Fan

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An Experimental Investigation of Constrained Melting Heat Transfer of Nano-Enhanced Phase Change Materials in a Horizontal Cylindrical Capsule Using Thermochromic Liquid Crystal Thermography

机译：用热致粒液晶热成像将纳米增强相变材料熔融传热的实验研究

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The constrained melting of nano-enhanced phase change materials (NePCM) in a horizontal cylindrical capsule was investigated via the utilization of thermochromic liquid crystal (TLC) technique for tracking the invisible phase interfaces. A parametric study was carried out by varying both the loading of NePCM (i.e., 0 wt %, 1 wt %, and 3 wt %) and the wall superheat (at 10°C and 30°C), leading to a total of six cases. Numerical simulations, based on the enthalpy-porosity method, were also performed to reveal the evolutions of temperature and convective flow fields during melting. It was first shown that the numerically predicted melting front evolutions are in good agreement with the TLC imaging results. A comparison among the six cases indicated that there is a similar melting pattern that heat conduction dominates the initial stage of melting and natural convection then takes over to play a more important role when melting proceeds. With the TLC-assisted reconstruction of the melting fronts, the instantaneous melting and heat storage rates were estimated, and melting was clearly found to slow down with increasing the loading of NePCM, as a result of the dramatically increased viscosity that deteriorates the contribution of natural convection to melting heat transfer.

机译：通过利用热致变色的液晶（TLC）技术来研究水平圆柱形胶囊中的纳米增强相变材料（NEPCM）的约束熔化，用于跟踪看不见的相界面。通过改变Nepcm的负载（即，0wt％，1wt％和3wt％）和壁过热（在10℃和30℃）中来进行参数研究，导致总共六个案例。还进行了基于焓孔隙度法的数值模拟，以揭示熔化过程中的温度和对流流场的演变。首先表明，与TLC成像结果有关的数量预测的熔化前进量。六种情况下的比较表明，存在类似的熔化模式，热传导占据熔化和自然对流的初始阶段，然后在融化所得级时占据更重要的作用。利用TLC辅助重建熔化阶段，估计瞬时熔化和储热速率，并且清楚地发现熔化随着NEPCM的载荷而减缓，因为巨大增加的粘度降低了自然的贡献对融化传热的对流。

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来源
《Journal of Heat Transfer》 |2021年第1期|012401.1-012401.11|共11页
作者
Nan Hu; Zi-Rui Li; Run-Hui Zhang; Jia Liu; Li-Wu Fan;
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作者单位

School of Energy Engineering Institute of Thermal Science and Power Systems Zhejiang University Zhejiang Hangzhou 310027 China;

School of Energy Engineering Institute of Thermal Science and Power Systems Zhejiang University Zhejiang Hangzhou 310027 China;

School of Energy Engineering Institute of Thermal Science and Power Systems Zhejiang University Zhejiang Hangzhou 310027 China;

School of Energy Engineering Institute of Thermal Science and Power Systems Zhejiang University Zhejiang Hangzhou 310027 China;

School of Energy Engineering Institute of Thermal Science and Power Systems Zhejiang University Zhejiang Hangzhou 310027 China State Key Laboratory of Clean Energy Utilization Zhejiang University Zhejiang Hangzhou 310027 China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
constrained melting; horizontal cylindrical capsule; latent heat storage; nano-enhanced phase change material; phase interface tracking; thermochromic liquid crystal;

机译：约束熔化;水平圆柱形胶囊;潜热储存;纳米增强相变材料;相界面跟踪;热致变色液晶;

An Experimental Investigation of Constrained Melting Heat Transfer of Nano-Enhanced Phase Change Materials in a Horizontal Cylindrical Capsule Using Thermochromic Liquid Crystal Thermography

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