基于Navier-Stokes方程的超短激光诱导金属膜微射流形成的数值研究

IF 1.7 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Laser Applications Pub Date : 2023-09-05 DOI:10.2351/7.0001027
Melika Esmaeili, Atoosa Sadat Arabanian, Somayeh Najafi, R. Massudi
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引用次数: 0

摘要

利用电子-声子热平衡的双温度模型(TTM)来确定涂覆在玻璃基板上的金属薄膜在超短激光脉冲照射下熔化时的热分布和激光通量阈值。本研究提出了一种基于Navier-Stokes方程的新模型来解释薄膜熔融区射流结构的形成。通过求解该方程,得到熔融区速度分布和位移的时间演化,可以数值模拟Marangoni对流效应,流体的圆周运动可以描述辐射中心区域射流形状结构的形成。将计算结果与数值解热弹塑性方程的结果进行了比较,并与已有的实验结果进行了比较,以保证用Navier-Stokes方程计算的微射流高度的准确性。观察到良好的一致性,特别是当辐照区域的温度明显超过薄膜的熔化温度时。此外,还对各种脉冲影响进行了计算。在这两种模型中,脉冲影响的增加导致微射流高度的增加。
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Numerical study of ultrashort laser-induced microjet formation on the metal film based on the Navier–Stokes equation
A two-temperature model (TTM) for the electron-phonon thermal equilibrium is used to determine the heat distribution and laser fluence threshold for melting a thin metal film coated on a glass substrate and irradiated by an ultrashort laser pulse. This study proposes a novel model based on the Navier–Stokes equation to explain the formation of jet-shaped structures in the film's molten region. By solving this equation and obtaining the temporal evolution of the velocity distribution and displacement in the molten region, the Marangoni convection effect can be numerically demonstrated, and the circular motion of the fluid can describe the formation of a jet-shaped structure in the central region of the radiation. The results are compared to those obtained by numerically solving the thermo-elastoplastic equations, and also, to the previously reported experimental results to ensure the accuracy of the microjet height calculated by the Navier–Stokes equation. Good agreement is observed, particularly when the temperature of the irradiated area is significantly over the film's melting temperature. In addition, several calculations are performed for various pulse fluences. In both models, increasing the pulse fluences leads to an increase in the height of microjets.
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来源期刊
CiteScore
3.60
自引率
9.50%
发文量
125
审稿时长
>12 weeks
期刊介绍: The Journal of Laser Applications (JLA) is the scientific platform of the Laser Institute of America (LIA) and is published in cooperation with AIP Publishing. The high-quality articles cover a broad range from fundamental and applied research and development to industrial applications. Therefore, JLA is a reflection of the state-of-R&D in photonic production, sensing and measurement as well as Laser safety. The following international and well known first-class scientists serve as allocated Editors in 9 new categories: High Precision Materials Processing with Ultrafast Lasers Laser Additive Manufacturing High Power Materials Processing with High Brightness Lasers Emerging Applications of Laser Technologies in High-performance/Multi-function Materials and Structures Surface Modification Lasers in Nanomanufacturing / Nanophotonics & Thin Film Technology Spectroscopy / Imaging / Diagnostics / Measurements Laser Systems and Markets Medical Applications & Safety Thermal Transportation Nanomaterials and Nanoprocessing Laser applications in Microelectronics.
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