Abstract
Buoyancy and Marangoni convection in melted zone generated by the melting and resolidification process of stainless steel under high power CO 2 laser irradiation was analyzed numerically. Governing equations with vorticity and stream function were solved for the flow field in the melted zone. Latent heat of fusion for melting and resolidification was treated with temperature recovery method. Development of the melted zone with time and the effect of the convection on heat transport process were discussed. Temperature in melted zone became more uniform and the depth of melted zone became thinner in depth and wider radially, as the convection was taken into account, in comparison with the cases in which it was neglected. Marangoni convection generated a high velocity convection with some small value of the temperature coefficient of surface tension. Comparison of the analytical results with the experimental results for several seconds irradiation under atmospheric condition showed that, the velocity of the surface of melted zone was almost in agreement with the results assuming the buoyancy convection, and the net evaporation coefficient was estimated to be much smaller in the experiment under atmospheric condition than that under vacuum condition
Published Version
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