Experimental and numerical modeling of Czochralski crystal growth under axial vibrational control of the melt

A novel scheme of application of axial vibration control (AVC) technique for Czochralski crystal growth has been realized by means of oscillating baffle submerged under the growing crystal. Modeling of heat-mass transfer in the growth system has been produced by both physical experiments with water–glycerol mixture and computer simulations using FLUENT software. The laminar vibrational flows, which suppressed thermoconvectional flows, have been arranged in the proposed AVC configuration. The vibrational flows were stable and well controlled in the viscosity range 1–400 cPz, whenever the crystal–melt interface was under or over the melt surface. The direction of the vibrational flows was favorable for crystal growth. Simulations demonstrated that the shape of the crystal–melt interface is strongly dependent on vibrational parameters.