Bubble Migration under Marangoni Effect

Abstract

Bubbles in melt should be removed from the interface in the solidification under microgravity. Marangoni effect is one of the possible candidate to move bubbles under microgravity environment. The migration of bubble under temperature gradient is studied under the microgravity given by the drop shaft. Bubbles have moved from cooler region to warmer one, but the velocity of bubble given by experiment is slower than that predicted by Young et al. The reason why the velocity is slow­er than the expected one is also studied .