A Numerical Analysis of the Macrosegregation of the Solidified Steel Structure with the Turbulence Effects

摘要

A numerical model has been developed to describe the macrosegregation of the solidified structure with the consideration of mass, momentum, energy and concentration equations in the turbulence regime through thermodynamic equilibrium at the solid-liquid interface in the steel casting process. Macroscopic through thermodynamic equilibrium at the solid-liquid interface in the steel casting process. Macroscopic trandsport equations are derived using volume average technique. Mushy zone is modeled as proous media blocking fluid flow by columnar dendrites. The turbulent characteristics in the melt and mushy zone are analyzed by using low-Reynolds number turbulence model. Modeling with the turbulent effects of the fluid flow can given appropriate solutions of macrosegregation pattern for large ingot castings or continuous castings. The flow field, solid fraction and macrosegregation patterns are presented. The results show that this modeling could give the proper evaluation for the steel casting process.