Abstract
Relating to vapor explosion, the effect of coolant subcooling is studied experimentally and theoretically. A molten tin droplet falls into thermally stratified water, in which the upper layer temperature is kept at 90°C while the lower layer temperature is varied from 10 to 70°C. In thermally stratified water, the explosion is much more likely to occur and the explosion pressure is much higher than in the uniform temperature water. This suggests that the coolant subcooling has a strong effect on the trigger mechanism of a vapor explosion by condensing the vapor film around the molten tin. The results of parametric calculations show that the pressure generated when the vapor film collapses is high enough to fragment the molten tin resulting vapor explosions.
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