光学学报, 2016, 36 (10): 1014001, 网络出版: 2016-10-12   

纳米薄膜激光照射过程的格子波尔兹曼方法模拟

Simulation of Lattice Boltzmann Method for Nano-Film Laser Irradiation Process
作者单位
1 上海理工大学能源与动力工程学院, 上海 200093
2 海南核电有限公司, 海南 昌江 572700
3 辽宁调兵山煤矸石发电有限责任公司, 辽宁 调兵山 112700
摘要
考虑到激光加热过程中电子和晶格之间的不平衡传热特性,将格子波尔兹曼方法(LBM)和双温度模型结合起来,建立了1个两步LBM方程,并用此方法对纳米薄膜在短脉冲激光照射过程中的热响应特性进行了模拟研究。分析了照射过程中薄膜内温度随时间及空间的变化规律;探讨了激光强度以及薄膜厚度对金属薄膜热响应的影响。研究结果表明,在照射过程中晶格温度的改变相对于电子温度的变化有明显的滞后效应,并且计算得到的电子温度响应及破坏阈值和实验结果吻合较好,说明所提出的两步LBM方程能够较好地描述激光照射过程中电子和晶格的不平衡传热现象。通过研究还发现,随着激光能量的增强以及薄膜厚度的减小,薄膜表面电子和晶格温度都有明显的升高,且电子和晶格温度达到稳定的时间均有所延迟。
Abstract
Considering the non-equilibrium heat transfer characteristics between electrons and lattices in the process of laser heating, a two-step lattice Boltzmann method (LBM) equation is established by combining the LBM and the two temperature model. Then the thermal response characteristic of a nano-film irradiated by the short-pulse laser is simulated using this method. The change law of temperature distribution in thin film with time and space is analyzed in the irradiation process. In addition, the effects of the laser intensity and the thin film thickness on the thermal response are also discussed. The results show that there exists a significant hysteresis phenomenon between the changes of the lattice temperature and the electron temperature in the irradiation process, and the calculated electron temperature response and damage thresholds are agree well with the experimental results. Those indicate that the proposed two-step LBM equation can describe the non-equilibrium heat transfer phenomenon between electrons and lattices in the process of the laser irradiation well. It is also found that with the enhancement of the laser energy and the decrease of the film thickness, the electron and lattice temperatures of the film surface are significantly increased, and the time at which the electron and the lattice temperature achieve stability are also delayed.

张珂, 李凌, 任松涛, 贾琼. 纳米薄膜激光照射过程的格子波尔兹曼方法模拟[J]. 光学学报, 2016, 36(10): 1014001. Zhang Ke, Li Ling, Ren Songtao, Jia Qiong. Simulation of Lattice Boltzmann Method for Nano-Film Laser Irradiation Process[J]. Acta Optica Sinica, 2016, 36(10): 1014001.

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