DYNAMICS OF PARTICLE-SOLIDIFICATION FRONT INTERACTIONS

摘要

A particle interacting with an advancing solidification front is studied using numerical simulations to couple phase change with particle motion. The particle is set in motion through the forces that act across the gap between the particle and the solidifying interface. A sharp-interface method is used to track both the phase boundary and the particle. Previous force expressions used in past literature are carefully scrutinized and found to inadequately describe the nature of the forces in the gap. The effect of a premelted layer between the particle and the solidification front on the interaction dynamics is also studied through the coupling procedure. It is determined that the use of a premelted layer in the coupled model greatly affects the dynamics of the particle-front interaction.