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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation of nanoparticle agglomeration on the effective thermal conductivity of a composite material
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Investigation of nanoparticle agglomeration on the effective thermal conductivity of a composite material

机译：纳米粒子团聚对复合材料有效导热系数的研究

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摘要

The viability of organic phase change materials (PCMs), such as paraffin wax, for passive thermal management of portable electronics improves if the PCM overall bulk thermal conductivity is increased through the addition of highly conducting nanoparticles. Previous work has suggested the possibility of increasing the bulk thermal conductivity of composite materials through the controlled agglomeration of nanoparticles, yet no theoretical study has been performed to investigate the conditions under which the bulk thermal conductivity enhancement is achieved. Therefore, this study examines the influence of both spherical clustering and linear percolation network formation on the resultant bulk conductivity. This approach uses effective medium and percolation theories for unpercolated and percolated areas, respectively. Theoretical approaches are shown for spherical clustering and a 1-d conduction model of linear percolation networks, and finite element analysis (FEA) is used for a 2-d conduction model of linear percolation networks. The results for herringbone graphite nanofibers (HGNFs) in a paraffin matrix suggest that spherical clustering and linear agglomeration tend to reduce the bulk thermal conductivity, which agrees with experimental observations. However, linear percolation networks may enhance the effective thermal conductivity when large inclusion-matrix to inclusion-inclusion Kapitza resistance ratios are used.
机译：如果通过添加高导电性的纳米粒子增加了PCM的整体整体导热系数，那么用于便携式电子设备被动热管理的有机相变材料（PCM）（例如石蜡）的可行性就会提高。先前的工作已经提出了通过控制纳米颗粒的团聚来增加复合材料的整体导热系数的可能性，但是还没有进行理论研究来研究实现整体导热系数提高的条件。因此，本研究考察了球形簇和线性渗流网络的形成对最终体积电导率的影响。这种方法分别对未渗透区域和渗透区域使用有效的介质和渗透理论。给出了用于球形聚类和线性渗流网络的一维传导模型的理论方法，并且对线性渗流网络的二维传导模型使用了有限元分析（FEA）。在石蜡基质中的人字形石墨纳米纤维（HGNFs）的结果表明，球形簇聚和线性团聚倾向于降低整体热导率，这与实验观察结果一致。但是，当使用较大的夹杂物与夹杂物-Kapitza电阻比时，线性渗滤网络可提高有效导热率。

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