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Numerical simulation of heat transfer and fluid flow in laser drilling of metals

机译：热传热与流体流动在激光钻孔中的数值模拟

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摘要

Laser processing as laser drilling, laser welding and laser cutting, etc. is rather important in modern manufacture, and the interaction of laser and matter is a complex phenomenon which should be detailed studied in order to increase the manufacture efficiency and quality. In this paper, a two-dimensional transient numerical model was developed to study the temperature field and molten pool size during pulsed laser keyhole drilling. The volume-of-fluid method was employed to track free surfaces, and melting and evaporation enthalpy, recoil pressure, surface tension, and energy loss due to evaporating materials were considered in this model. Besides, the enthalpy-porosity technique was also applied to account for the latent heat during melting and solidification. Temperature fields and melt pool size were numerically simulated via finite element method. Moreover, the effectiveness of the developed computational procedure had been confirmed by experiments.
机译：激光加工作为激光钻孔，激光焊接和激光切割等在现代制造中具有相当重要，激光和物质的相互作用是一种复杂的现象，应该详细研究，以提高制造效率和质量。本文开发了一种二维瞬态数值模型，以研究脉冲激光锁孔钻孔期间的温度场和熔池尺寸。在该模型中，使用流体体积法来跟踪自由表面，熔化和蒸发焓，反冲压力，表面张力和由于蒸发材料引起的能量损失。此外，焓 - 孔隙率技术也被应用于熔化和凝固过程中的潜热。通过有限元方法进行数值模拟温度场和熔融池尺寸。此外，通过实验证实了开发的计算程序的有效性。

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