Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
ANALYTICAL MODEL OF MICROSSEGREGATION IN THE SOLIDIFICATION OF A BINARY ALLOY INCLUDING THERMODIFFUSION EFFECT
Submission Author:
Romulo Heringer , SC
Co-Authors:
Romulo Heringer
Presenter: Romulo Heringer
doi://10.26678/ABCM.ENCIT2022.CIT22-0092
Abstract
This text presents a mathematical model for the microsegregation during the solidification of a binary alloy, considering thermodiffusion. Heat and solute mass transfer are evaluated in a dendrite branch by choosing the thermodynamic system in such a way that precludes chemical diffusion through its boundary, but the thermal gradient can drive thermodiffusion. The aim was to obtain a analytical equation for microsegregation where thermodiffusion parameters appear explicitly. With such a result, one can easily evaluate whether the phenomena inherent to the solidification process could enhance thermodiffusion when compared to solute transport without phase change. It seems that thermodiffusion coefficient should not be the better parameter to indicate the relevance of the Soret effect in the solidification process. Some dimensionless parameters emerge from the proposed model, which can be more suitable for this assessment.
Keywords
Heat and mass transfer, Solidification, Microsegregation, Soret effect, Analytical Solution
