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首页> 外文会议>Symposium F: Third International Conference on Laser Ablation (Cola'95) of the 1995 E-Mrs Spring Conference May 22-26, 1995 Strasbourg, France >Hydrodynamic phenomena during laser irradiation: a finite difference approach
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Hydrodynamic phenomena during laser irradiation: a finite difference approach

机译：激光辐照过程中的流体动力学现象：有限差分法

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摘要

We have developed a numerical method to compute the physical behavior of metals and semiconductors, such as Au and Si, under the influence of laser irradiation at low fluences. Electronic effects and evaporation of single atoms are neglected. In the model employed, the thermal reaction of the solid-melt system is calculated by solving the two-dimensional heat conduction equation, where the phase transition solid-liquid is taken into account. Accelerations acting on the melt caused by the thermal expansion of the solid and the phase transition at the interface are also computed. All this information is then parametrically considered in our melt dynamics solver, which makes use of the so-called MAC (Marker and Cell) method. This technique describes the flow of an incompressible fluid, the boundary of which is partially confined and partially free. Our results for laser irradiation of Au and Si show the same tendency as the experimentally observed data: Au, in contrast to Si, tends to from droplets on the surface. Those experimental findings are consequently consistent with the dominance of hydrodynamic effects under low-fluence laser irradiation.
机译：我们已经开发出一种数值方法来计算低通量的激光辐照影响下的金属和半导体（例如Au和Si）的物理行为。忽略了电子效应和单个原子的蒸发。在所采用的模型中，固溶体系的热反应是通过求解二维热传导方程来计算的，其中考虑了相变固液。还计算了由固体的热膨胀和界面处的相变引起的作用在熔体上的加速度。然后，在我们的熔体动力学求解器中对所有这些信息进行参数化考虑，该求解器利用了所谓的MAC（标记和单元）方法。该技术描述了不可压缩流体的流动，该流体的边界部分受限且部分自由。我们对Au和Si进行激光辐照的结果显示出与实验观察到的数据相同的趋势：与Si相反，Au倾向于来自表面上的液滴。因此，这些实验结果与低通量激光辐照下流体动力学效应的优势相一致。

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