Investigation of The Thermocapillary Flow in A Liquid Bridge subject to A Non-uniform Rotating Magnetic Field
The effect of an external non-uniform rotating magnetic field (RMF) on the thermocapillary flow in a liquid bridge under microgravity is studied numerically. The thermocapillary flow subject to a non-uniform RMF (7mT, 25Hz) is investigated over a range of Marangoni numbers (15-40). The results indicate that, in comparison with the thermocapillary flow without the magnetic field, the maximum tangential velocity is greatly enhanced and the maximum axial velocity is reduced significantly due to the effect of the non-uniform RMF. As a consequence, the thermocapillary flow remains steady and approximately axisymmetric under the effect of the non-uniform RMF. These results demonstrate that a non-uniform RMF can be used as an effective method to control the thermocapillary flow.
Modelling of the isothermal melt flow due to rotating magnetic fields in crystal growth
The use of a rotating magnetic field promises the feature of a contactless flow control in crystal growth especially for configurations where an increase of the material transport in a definite way is desired. This paper gives the comparison of numerically calculated and experimentally obtained results on the flow due to a rotating magnetic field as well as numerical results on the influence of the field parameters (frequency, amplitude) on the fluid flow in the melt.
Three-dimensional flow transitions under a rotating magnetic field
The present paper deals with the flows occurring in isothermal metallic liquids confined in cylindrical cavities and subjected to a rotating magnetic field. We analyze the influence of the main parameters: aspect ratio, Hartmann number and rotating Reynolds number on the structure and the nature of the melt flow. We also give the scaling laws for characteristic quantities such as azimuthal and meridional velocities.