Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
NUMERICAL EVALUATION OF A DIFFUSIVE MODEL FOR Sn-39.5 wt% Bi ALLOY SOLIDIFICATION EXPERIMENT
Submission Author:
Romulo Heringer , SC
Co-Authors:
Leonardo Bernardo, Romulo Heringer
Presenter: Leonardo Bernardo
doi://10.26678/ABCM.COBEM2019.COB2019-1516
Abstract
The present contribution is a numerical simulation for a solidification experiment of Sn-39.5 wt% Bi alloy, performed by others, who used in-situ X-ray radiography to observe microstructures during their growth. Heat and solute transfers, phase change and dendrite growth kinetic were evaluated in order to analyze: a) if recalescence occurs which could contribute to the fragmentation rate observed in the experiment; b) the contribution, for the solid fraction evolution, of the remelting associated with diffusion caused by differences on the curvature of dendrites arms interface. These phenomena are described in the context of coarsening of solidification dendrites. We proposed a mathematical model elaborated for the solidification of Sn-39.5 wt% Bi which allowed us to evaluate the questions stated above. We found that, including the remelting mentioned above in the solid fraction calculation leads to better agreement when compared to data reported in the literature related to the concerned experiment.
Keywords
Solidification, Numerical simulation, Heat and mass transfer
