Abstract
Numerical simulations have been carried out to investigate the influence of external environment on thermocapillary convection in high Prandtl number ( Pr =68) liquid. The geometric model of physical problem is that the the liquid bridge surrounded by ambient air under zero or ground gravity. The interface velocity, temperature, heat flux and flow pattern in the liquid bridge are presented and discussed under different conditions by changing the external environment. The buoyancy convection produces a symmetrical vortex in the liquid bridge. The ambient air affects the distributions of the temperature velocity and heat flux on the interface by changing the thermocapillary convection.
Highlights
In present industrial practice, the floating zone method is used for growing the high quality crystal
Abstract.Numerical simulations have been carried out to investigate the influence of external environment on thermocapillary convection in high Prandtl number (Pr=68) liquid
The ambient air affects the distributions of the temperature velocity and heat flux on the interface by changing the thermocapillary convection
Summary
The floating zone method is used for growing the high quality crystal. Y et al.[2] put the liquid bridge into incubator and changed its temperature, and their results illustrated that critical parameters strongly depend on temperature of ambient air. In another experiment[3], a thin plastic plate was placed in the vicinity of liquid bridge did not contact with the interface. A et al.[4,5] carried out the research about the liquid bridge with deflector shield They illustrated that the critical temperature and oscillation frequency strongly depend on the ambient conditions and temperature of deflector shield. Almost experiments were carried out under normal gravity, there is still contention on the effect of the air with different temperature and velocity on thermocapillary flow under zero gravity
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