Unequal splitting phenomenon of cavitation bubbles near rigid boundaries within a narrow gap

Physics of Fluids, Год журнала: 2025, Номер 37(1)

Опубликована: Янв. 1, 2025

The present work investigates the unequal splitting of cavitation bubbles near rigid boundaries within a narrow gap. Based on high-speed photographic experiments, typical phenomenon bubble is shown, and parametric partitions in proximity to cylinder flat wall are presented. Kelvin impulse theory, underlying physical bubble-splitting mechanisms explored. In addition, impacts main parameters quantitatively analyzed. conclusions as follows. (1) Under different cylinder–bubble distances, splits into three cases: an upper larger part lower smaller part, two equal-sized parts, part. (2) caused by inconsistencies between directions bubble-collapse jet centroid movement. (3) As radius cylinder–wall distance increase, shifts from case 1 3, suggesting effect increases flat-wall decreases.

Язык: Английский

Laser-Induced Single Cavitation Bubble Dynamics in the Presence of Microscale Roughness

Langmuir, Год журнала: 2025, Номер unknown

Опубликована: Май 1, 2025

Cavitation-induced erosion presents major problems for hydraulic and marine systems due to the collapse of bubbles near solid boundaries. This work investigates a passive control technique employing microstructured rough surface reduce erosion. High-speed imaging studies were performed analyze dynamics single bubble induced by laser-generated plasma microscale smooth surface. The bubble's equivalent radius was investigated over time three varying relative wall distances, its behavior assessed specific phases: growth, collapse, rebound. adjacent demonstrated symmetrical formed toroidal structures affixed wall, in accordance with established bubble-wall interaction phenomena documented prior research. surface, on other hand, caused an asymmetric rebound, causing counter-jet form that moved away from divergence anticipated symmetric indicated roughness substantially influences dynamics, diminishing microjet momentum associated cavity size, thus alleviating These results provided innovative perspectives cavitation strategies through modification.

Язык: Английский

Theoretical and experimental research on the impacts of the Joukowsky hydrofoils on the bubble collapse dynamics within a confined space

Ultrasonics Sonochemistry, Год журнала: 2024, Номер 112, С. 107174 - 107174

Опубликована: Ноя. 24, 2024

Язык: Английский