Abstract
The overall heat transfer coefficients during solidification of tin are evaluated by unidirectional solidification under two conditions of 1G and microgravity of 10 -4 G. The heat transfer coefficient under microgravity reduces to about 60% compared with that obtained under the condition of usual gravity. This may be due to reduced contact pressure and hydrostatic pressure of tin in microgravity. Thermal convection flow of water and mercury are also investigated in a transition period from gravitational to microgravitational environments in order to recognize the effect of the convection flow on unidirectional solidification in the transition. Experiments in the microgravity environment were conducted in the facilities of a drop shaft located at Kamisunagawa in Japan (JAMIC).
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