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首页> 外文期刊>International Journal of Heat and Mass Transfer >Melting and dynamic-surface deformation in laser surface heating
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Melting and dynamic-surface deformation in laser surface heating

机译：激光表面加热中的熔化和动态表面变形

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摘要

Axisymmetric thermocapillary convection during laser melting has been investigated numerically. The dynamic free surface, with pinned contact point at the edge of the molten pool, is obtained as a solution of the coupled transport equations. Free surfaces at the steady state are depressed at the center and convex near the edge of the molten pool because fluid flows away from the center. The surface deformations decrease with increasing Re at fixed Ca, while they increase with increasing Ca at fixed Re. The width and depth of the pool, temperature and surface deformation increase with increasing Bf. At the transient cases, the size of the pool and surface deformation increase monotonically with time. The shape of the free surface is a bowl bump at a low Re, while at a high Re two kinds of surface shapes occur with time: bowl and Sombrero-shaped bumps.
机译：数值研究了激光熔化过程中的轴对称热毛细管对流。获得动态自由表面，其在熔池边缘具有固定的接触点，可以作为耦合传输方程的解。处于稳定状态的自由表面在中心处凹陷，并在熔池边缘附近凸出，因为流体从中心流出。在固定Ca下，表面变形随Re的增加而减小，而在固定Re下，随Ca的增加而增加。池的宽度和深度，温度和表面变形随Bf的增加而增加。在瞬态情况下，池的大小和表面变形随时间单调增加。自由表面的形状在Re较低时为碗状凸起，而在Re较高时，会随时间出现两种表面形状：碗状和草帽形凸起。

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