通过结合微观的格子Boltzmann方法和宏观的有限差分法,建立了一种计算两个固体表面间接触热阻的多尺度分析方法.计算分析了表面粗糙度、压力、材料硬度、导热系数等对接触热阻的影响,结果表明拥有相同粗糙度的表面,在低压条件下,导热系数是主要影响因素,而在高压情况下,压力是主导影响因素.计算结果与实验数据的对比分析显示,该多尺度模型与实验数据有较好的一致性.
A multiscale model combining the microscopic lattice Boltzmann (LB) method and the traditional finite difference (FD) was developed to predict the thermal contact resistance (TCR) between two solids' surfaces.The influences of surface roughness,pressure,materials' hardness and thermal conductivity,etc on TCR were calculated and analyzed.The results indicate that,with the same roughness surface,the materials' thermal conductivity will play the leading role on TCR when the pressure is low,but when the pressure get increased,the pressure and materials' microhardness will have a great influence on TCR,yet the effect of thermal conductivity will decrease.The comparisons between simulated results with experimental results show that the TCR calculated by multiscale model coincides well with experimental data.
参考文献
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