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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Solidification of a binary metal alloy in a turbulent melt flow driven by AC magnetic fields

page 7
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.220
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RÉSUMÉ

In this work we numerically study the impact of Taylor-Görtler vortices inside a melt, driven by a rotating magnetic field, on the macrosegregation and the shape of the mushy zone during unidirectional solidification of Al-7wt%Si alloy. The weakly turbulent flow was modeled by means of direct numerical simulations in an axisymmetric approach, where the transient heat and mass transfer were simulated by means of a standard mixture model. Both types of solidification, columnar and equiaxed, were considered by the application of both a permeability and a hybrid model to treat the fluid flow in the mushy zone. Our results demonstrate that in the case of columnar solidification the Taylor-Görtler vortices cause both a wavy shape of the mushy zone and segregations in the form of a fir tree with a distinct accumulation of silicon along the axis of the cylinder.

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