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

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.220
7 pages

Petr A. Nikrityuk
CIC Virtuhcon, Department for Energy Process Engineering and Chemical Engineering, Technische Universitat Bergakademie Freiberg, Fuchsmuhlenweg 9, 09596 Freiberg, Germany

K. Eckert
Magnetofluiddynamics, Institute of Fluid Dynamics, Technische Universität Dresden, Mommsenstr. 13, 01062 Dresden, Germany

S. Eckert
MHD Department, Forschungszentrum Dresden-Rossendorf (FZD), P.O.Box 510119, 01314 Dresden, Germany

Abstrakt

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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