Abstract
Surface-tension driven flow in NaBi(WO4)2 melt isvisualized by means of the already proved method of high temperature insitu optical observation. The transition phenomena of the melt fromsteady spatial to oscillatory behaviour in melt are observed. Theoscillatory thermocapillary convection is accompanied by synchronoustemperature oscillations with the frequency 10 Hz. The onset temperatureof thermocapillary convection varies with the change of meniscuscurvature of the melt free surface, which probably due to the liquidpressure at the surface associated with the curvature of meniscus. Theoscillatory frequency is proportional to the temperature. Finally,another kind of oscillatory thermocapillary convection with thefrequency about 5 Hz dominating in the undercooled melt is alsoobserved.
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