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首页> 外文期刊>International Journal of Heat and Mass Transfer >In-plane interfacial phonon transport through multi-layer thin films by theoretical analyses and Monte Carlo simulations
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In-plane interfacial phonon transport through multi-layer thin films by theoretical analyses and Monte Carlo simulations

机译：通过理论分析和蒙特卡罗模拟通过多层薄膜的面内界面声子传输

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摘要

This work studies the in-plane phonon transport through double-layer, superlattice, and four-layer thin films by theoretical analyses and Monte Carlo simulations. The spectral diffuse mismatch model and the adiabatic diffuse scattering are taken as the interface and surface boundary conditions respectively. The results indicate that the number of thin-film layers has little impact on the heat flux distribution within each layer and there is a heat flux discontinuity at the interface. Indentical in-plane thermal conductivities are obtained for double-layer, superlattice, and four-layer thin films with a uniform thickness of each layer. This means that the number of thin-film layers has negligible impacts on the in-plane thermal conductivity, which can provide the first explicit explanation to the observation in a recent experiment. Finally, the minimum in-plane thermal conductivity is found in thin films when varying thickness ratios. The extreme points are also analytically obtained. This law is completely different from that for the cross-plane thermal conductivity or that predicted by the Fourier's law of heat conduction for in-plane heat transport which leads to a monotonic relation between the thermal conductivity and the thickness ratio.
机译：这项工作研究了通过理论分析和蒙特卡罗模拟通过双层，超晶格，和四层薄膜的面内的声子传输。频谱扩散不匹配模型和绝热漫散射取作接口和分别表面边界条件。结果表明，薄膜层的数量对每个层内的热通量分布的影响很小并且存在在界面处的热通量的不连续性。张玉峰面内热导率为双层，超晶格，以及与每个层的厚度均匀四层薄膜获得。这意味着，薄膜层的数量对在平面热导率可忽略不计的影响，其可以提供到观察第一明确的解释在最近的实验。最后，变化的厚度比时的最小面内导热率在薄膜中找到。也有分析得到的极值点。此法是从完全不同的用于交叉平面热导率或在面内的热传输，这导致热导率和厚度比之间的单调关系预测通过热传导的傅立叶定律。

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