465 / 2024-04-02 08:17:32

Experimental study on the effect of an non-coaxial spherical particle on the collapse characteristics of cavitation bubble near a rigid wall

cavitation bubble,particle,bubble dynamics

Subtheme 8: Estuarine and Coastal Engineering > Topic 3: Fluid-Structure-Seabed Interaction

Cavitation in sediment laden flow has been a significant issue in hydraulic engineering and industrial production. Studying collapse characteristics of a cavitation bubble interacting with a spherical particle is instructive to reveal the mechanism of cavitation in sediment laden flow. In this study, the effects of an non-coaxial spherical particle on the collapse characteristics of a cavitation bubble near the wall, including collapse morphology, collapse time, and migration characteristics, are investigated by applying an underwater low-voltage electric discharge device and a high-speed camera system. The experimental results indicate that the radial flow of cavitation bubble is retard by the spherical particle’s surface, the cavitation bubble surface deforms and is elongated. The minimum volume of the bubble increases, and the collapse time is prolonged. Due to the existence of an non-coaxial spherical particle in vicinity of the cavitation bubble, the migration distance of bubbles towards the wall is reduced, the collapse direction is deflected by the spherical particle, which provides important enlightenment for understanding the mechanism of cavitation erosion reduction in sediment laden flow.