Article
Single Cavitation Bubble Dynamics and Erosion in a Planar Shear Flow (en)
* Presenting author
Abstract:
We study the dynamics and erosion of a single cavitation bubble nucleated in a shear 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 multiple bubble collapses next to an aluminium sample is measured using confocal profilometry. A moderate shear flow velocity of 18 m/s already deforms the bubble in a peculiar way and breaks the axial symmetry. The altered jetting behaviour can change the bubble-wall interaction drastically. In particular, the violent collapse in contact with the surface can be avoided by weakening or completely suppressing the formation of a directed jet flow toward the surface.