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首页> 外文期刊>Computational thermal sciences >THERMAL CONDUCTIVITY ENHANCEMENT OF PCMS FOR AUTOMOTIVE THERMAL ENERGY STORAGE APPLICATIONS: EXPERIMENTAL AND NUMERICAL INVESTIGATIONS
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THERMAL CONDUCTIVITY ENHANCEMENT OF PCMS FOR AUTOMOTIVE THERMAL ENERGY STORAGE APPLICATIONS: EXPERIMENTAL AND NUMERICAL INVESTIGATIONS

机译：用于汽车热能存储应用的PCMS的导热性增强：实验和数值研究

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This study focuses on the evaluation of the equivalent thermal conductivity of a composite material comprising a phase change material (PCM) and periodic aluminum fins. This composite is a part of a heat accumulator. The evolution of the thermal conductivity with the fin volume fraction was studied through experimental measurements and numerical simulations. Two numerical models were developed on the basis of the resolution of 2D heat transfer equations with the finite volume method in order to determine the impact of the fin volume fraction on the thermal conductivity of the medium. In the first model, fins and PCM were modeled, while in the second model, the fins were not directly simulated but taken into account in terms of equivalent conductivity. A prototype was evaluated on a test bench in order to calibrate the equivalent conductivity and validate the modeling. A numerical parametric study was performed and showed that the equivalent conductivity can increase up to 150 times the PCM conductivity with a better distribution of the fins in the PCM. A correlation of the PCM equivalent thermal conductivity as a function of fin pitch is given for a range of aluminum volume fractions from 0 to 65%.
机译：这项研究的重点是评估包括相变材料（PCM）和周期性铝翅片的复合材料的等效导热系数。该复合材料是蓄热器的一部分。通过实验测量和数值模拟研究了导热系数随翅片体积分数的变化。为了确定翅片体积分数对介质导热系数的影响，在有限体积法的二维传热方程解析基础上开发了两个数值模型。在第一个模型中，对鳍和PCM进行了建模，而在第二个模型中，未直接模拟鳍，而是在等效电导率方面进行了考虑。在测试台上评估了原型，以便校准等效电导率并验证模型。进行了数值参数研究，结果表明等效电导率可以增加到PCM电导率的150倍，并且鳍片在PCM中分布更好。对于铝体积分数从0到65％的范围，给出了PCM等效导热系数与鳍间距的关系。

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