Author(s)

W. Hariz, C.T. Nguyen, D. Vo-Ngoc

Abstract

Numerical study of the effects of iso-radiation on a Ge float zone operating under reduced and normal gravity conditions W. Hariz, C.T. Nguyen, D. Vo-Ngoc School of Engineering, Universite de Moncton, Moncton, New Brunswick El A 3E9, Canada ABSTRACT The effects of iso-rotation on the flow and thermal fields in a germanium float zone under reduced and normal gravity conditions have been numerically studied. Results have shown the great beneficial effects of the iso-rotation : the thermocapillary flow is confined within a narrow region along the zone free surface and its intensity decreases considerably with the rotational rate. The axial temperature gradient along the disks becomes more uniform with the increase of the rotational rate. Under the influence of the gravity, the flow structure becomes asymmetrical and very complex. However, even under 1-g condition, only a low rotational rate would be sufficient to suppress the natural convection effects and restore the perfect symmet

Keywords