Dr. Vladimir Galindo
Phone: +49 351 260 3391

Electromagnetic melt flow control in Vertical Gradient Freeze (VGF) crystal growth

Flow stability analysis

Numerical simulation of a typical VGF buoyant flow under the influence of a rotating magnetic field (RMF) using the CFD library OpenFOAM® and taking into account the buoyancy and the induced electromagnetic force density.

Temperature iso-surfaces Velocity vector plot at a vertical plane

Time evolution of the kinetic energy of the meridional flow under two different thermal conditions showing the transition to the oscillatory flow regime

  • The transition to time-dependent flow regimes with increasing RMF depends strongly on the thermal field the melt is exposed to
  • The critical Taylor number Tac for the transition from steady to oscillatory flow increases with increasing axial temperature difference (in the isothermal regime: Tac=1.23x105)