NUMERICAL-SIMULATION FOR MELT FLOW AROUND DENDRITE TIP

The morphology of dendrite in the supercooled melt will be influenced by the natural convection in the melt. A numerical simulation program based on FEM is developed for 2-dimensional viscous fluid flow with natural convection. The program is applied to the melt flow around a dendrite. The effects of natural convection on dendrite, which grows upward or downward to the gravity in supercooled melt of the pure succinonitrile, are analyzed by this code. It is shown that the flow affects largely to the heat flux from solid to liquid (in supercooled melt) around the dendrite tip in the lower growth rate. The temperature gradient on the interface behaves characteristically corresponding to the direction of flow near the dendrite tip.