Comparison of two-phase and three-phase macroscopic models of equiaxed grain growth in solidification of binary alloy with electromagnetic stirring
Résumé
Simulations of equiaxed solidification using two-phase and three-phase models are performed for the experimental benchmark AFRODITE with electromagnetic stirring. A threephase model which was presented by authors elsewhere accounts for solid phase, inter-and extradendritic liquid phases. With respect to that model, the two-phase approach can be considered as reduced or simplified, yet, this implies also less number of assumptions regarding closure relations. One of parameters which exists in both models and which cannot be transposed directly from one model to another is critical packing fraction at which solid phase is supposed to be blocked. In simulations a large difference in evolution of convective flow and developement of the solid phase was found. As expected, final segregation obtained with twophase model is stronger, yet, it is qualitatively similar to the segregation pattern obtained with three-phase model.
Origine : Fichiers produits par l'(les) auteur(s)