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A study of the effects of macrosegregation and buoyancy-driven flow in binary mixture solidification

โœ Scribed by S.K. Sinha; T. Sundararajan; V.K. Garg

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
712 KB
Volume
36
Category
Article
ISSN
0017-9310

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โœฆ Synopsis

A generalized anisotropic porous medium approach is devel oped for modelling the flow. heat and mass transport processes during binary mixture solidification. Transient predictions are obtai ned using FEM, coupl ed with an implicit time-marching scheme, for solidification i nsi de a two-dimensional rectangular enclosure. A parametric study focusing attention on the effects of solutal buoyancy and thermal buoyancy is presented. It is observed that three parameters. namely the thermal Rayleigh number (Ru,,). the solutal Rayleigh number (Ru,) and the relative density change parameter (u?). significantly alter the Row fields i n the liquid and the mushy regions. Dependi ng upon the nature of these flow fields, the solute enrichment caused by macrosegregation may occur on the top or the bottom region of the enclosure.

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Directional solidification of a dilute electrically conducting binary alloy driven by the combined action of buoyancy, surface-tension, and electromagnetic forces is considered. A numerical methodology using a moving finite element technique is proposed for the simulation of the above phase change p