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根据德拜物理模型,采用格子玻尔兹曼方法(LBM)对纳米二氧化硅薄膜内的声子热输运特性进行了模拟分析,得到了薄膜内的温度响应特性;在此基础上,分析了其法向有效导热系数。计算结果表明,当努森数大于0.01时,薄膜边界处出现温度跳跃,呈现出明显的微纳米尺度传热特性;当薄膜厚度小于20nm时,减小厚度可使其有效导热系数迅速降低;当薄膜厚度大于20nm时,其有效导热系数趋于恒定。
According to the Debye physical model, the lattice heat transfer characteristics of the nanosilica film were simulated by the lattice Boltzmann method (LBM), and the temperature response characteristics of the film were obtained. Based on the analysis, Its normal effective thermal conductivity. The calculated results show that when the Knudsen number is greater than 0.01, the temperature jump occurs at the boundary of the film, showing obvious micro-nano scale heat transfer characteristics. When the film thickness is less than 20 nm, the effective thermal conductivity decreases rapidly when the film thickness is less than 20 nm. Film thickness greater than 20nm, its effective thermal conductivity tends to be constant.