Simulation Model for Solidification Process in Planar Flow Casting Using the Multi-zone Method

摘要

A numerical solution model based on the multi-zone method for a full transport equation system in planar flow casting was developed. The multi-zone consists of the solid, the liquid and the cooling roll zone. In the numerical solution model, the local solidification rate for the solidification front of the liquid zone (the puddle) is expressed as two components; i.e., the component of vertical velocity to the surface of the cooling roll zone and the component of partial ribbon thickness difference in the downstream direction. Additionally, a practical mesh deforming method in the liquid zone was proposed. In the mesh deforming method, the actual shape of the solidification front is considered when the free surfaces position of the puddle is explored; this shape could be more complex than that under the power series assumption as in conventional models. The prediction accuracy improved with the present model in the puddle shape and the ribbon thickness. A characteristic rise in solidification rate near the downstream end of the puddle was observed as a first in the simulation.