Dynamics of a laser-induced buoyant bubble near a vertical rigid boundary

In this paper, systematical experiments are carried out to study the distinct behavior of a buoyant cavitation bubble near a vertical rigid boundary. Under the combined influence of gravity and the rigid boundary, the bubble centroid migrates rapidly when the bubble completely collapses, and a microjet of intermediate strength subsequently penetrates the bubble in the same inclined direction. By recalling the nondimensional form of the Kelvin impulses, or the pressure anisotropy parameters, we analytically predict the angle between the jet and the horizontal direction at different experimental conditions. We further successfully establish the scaling law of the jet velocity by denoting the displacement of the bubble centroid as the characteristic length scale. The findings of this study contribute to our understanding of the nonspherical cavitation bubble dynamics under the simultaneous influence of multiple factors.