Abstract
Cavitation damage, which is induced by pressure waves in mercury, is viewed as one of the critical issues to satisfy high power spallation neutron source. Microbubble injection into the mercury is under study to mitigate the pressure waves. The mitigation effect is dependent on bubble distribution and size. It is important to estimate its lifetime to determine the bubble distribution and injection position. However, data for the lifetime estimation in mercury are insufficient. In this study, helium microbubbles in contact with an acrylic wall were observed and their lifetimes were measured, since mercury is an opaque liquid. Based on the observed bubbles, actual lifetime of bubbles suspended in the liquid was estimated. It was found that lifetime of microbubbles in mercury is longer than in water.
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