Numerical modeling of laser-induced molten pool for laser interaction with metal material
1.Faculty of Science,Jiangsu University,Zhenjiang,Jiangsu 212013,China;2.School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China
Abstract：An axisymmetric numerical model of a laser-induced molten pool has been developed for a laser interaction with Al plate.Based on the mixture continuity equations,the coupled PDEs for laminar fluid flow and heat transfer were solved by the finite element method,taking into account the coupled effects of buoyancy,Marangoni force and the thermophysical characteristics with temperature variations.The temperature distribution,the molten pool shapes and fluid flow were computed for three cases： δγ/δT0,δγ/δT0,δγ/δT=0,corresponding to three different surface tension gradients.The numerical results show that the temperature distribution is similar with the Gaussian beam intensity,Marangoni flow is the main form of the liquid flow,δγ/δT plays a decisive role in the fluid flow of the molten pool,and fluid flow has a significant effect on the shape of the molten pool,which can not be ignored during laser processing.
2010, Vol. 31 
