Dynamic response of the elastic boundary near a single cavitation bubble

Abstract

We studied the physical mechanism behind the bubble-elastic boundary interaction. In the present paper, three high-speed cameras were used to simultaneously test. Through digital image correlation technology, experimental data were obtained and analyzed, such as elastic boundary deformation. The results revealed that, due to the convex-concave deformation of the elastic boundary, the maximum collapse velocity occurred on both sides of the bubble wall. The deformation of the elastic boundary first increased and then decreased as the initial bubble-boundary distance decreased. We found that the convex deformation of the elastic boundary was exceptional, and nearby was gully, which greatly disturbed the flow field and thus affected the bubble collapse evolution. The boundary deformation velocity was in the shape of a ring, that is, the deformation was transmitted around the boundary in the form of a wave, diffusing energy. Overall, elastic boundary absorbed energy through its own convex-concave deformation, and this energy was transferred to the elastic boundary to alleviate the damage of cavitation bubbles.