ISSN Online: 2377-424X
International Heat Transfer Conference 12
Effect of high frequency magnetic field on FZ silicon melt convection
Abstract
Melt convection during the crystal growth process seriously affects the crystal quality. Therefore, the control
of melt convection becomes important. For this purpose, we considered the utilization of high frequency
magnetic field to control the natural convection in the FZ silicon melt which was heated by radiation on the earth,
where the buoyancy and the Marangoni forces were acting simultaneously, and numerically investigated the
effect. The results reveal that the high frequency magnetic field has the damping effect on the melt convection,
and is useful to control the melt convection. The intensity of melt convection is decreased with applied electric
current density up to certain value. Beyond this value, the convection intensity is increased drastically with
counter direction due to the strong electromagnetic force. In addition, the intensity of upper convection cell is
slightly increased due to the buoyancy force and the flow and temperature fields become asymmetric respect to
the upper and lower region. The impurity distribution in the crystal is also affected by the melt flow and it
becomes flat respect to the radial direction at an adequate intensity of the high frequency electromagnetic field.