Abstract
A high-speed liquid jet is commonly observed during the collapse phase of a cavitation bubble. In this letter, we present a surprising counter-jet (directed away from the nearby boundary) that forms in the early expansion phase of the bubble near a curved elastic boundary, which has not been reported before. The boundary integral simulation reveals the most possible mechanism as follows: First, the expansion of the bubble causes a local concave deformation on the boundary. Thereafter, the bubble partly envelops the curved elastic boundary, leading to the confinement of some liquid in a local dent. During the deformation recovery, a localised high pressure region is built up within the narrow dent, which drives a thin liquid jet away from the boundary.
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