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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。
By combining the microscopic Lattice Boltzmann method and the macroscopic finite difference method, a multi-scale analysis method for calculating the thermal contact resistance between two solid surfaces was established. The effects of surface roughness, pressure, material hardness and thermal conductivity on the contact thermal resistance were calculated and analyzed. The results show that the thermal conductivity is the main factor under the condition of low pressure and the same surface roughness. Under high pressure, Is the dominant factor. Comparing the calculated results with the experimental data, it shows that the multi-scale model is in good agreement with the experimental data.