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Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 51, 2007 - Issue 1
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Original Articles

Remelting of Solid and its Effect on Macrosegregation During Solidification

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Pages 59-83 | Received 25 Dec 2005, Accepted 28 Feb 2006, Published online: 15 Dec 2006
 

Abstract

A macroscopic model for simulating local remelting during binary alloy solidification is presented. In order to model the remelting phenomenon, the modified liquid concentration during remelting is calculated by taking into account the previously frozen solid concentration profile. This procedure is integrated into an existing macroscopic solidification model, in which the complete set of volume-averaged equivalent single-phase governing equations are solved using a pressure-based finite-volume method. As case studies, simulations are performed for a binary solution of NH4Cl–69 wt%H2O and for Pb–15 wt%Sn alloy solidified in a side-cooled cavity. Predicted results with the present model are compared with experimental results available in the literature, and the agreement is found to be good.

Arvind Kumar and Pradip Dutta gratefully acknowledge the financial support of General Motors Corporation.

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