Contribution
Cavitation Bubble Dynamics and Erosion in a Confined Planar Flow
* Presenting author
Abstract:
We study the dynamics and erosion of cavitation bubbles nucleated in a planar flow inside a narrow gap formed by two parallel flat plates. High-speed recordings show rich and distinct bubble dynamics and the material damage from repetitive bubble collapses next to an aluminium sample is measured using confocal profilometry. A moderate flow velocity of 15 m/s already deforms the bubble in a peculiar way and breaks the axial symmetry. Additionally, when the bubbles translate with the flow and the dynamics of the ring collapse changes, the damage pattern on the gap wall shifts from a single deep hole to a cloud of multiple shallow pits.