Investigation of the bubble splitting and jet dynamics near a corner within confined spaces

The present paper systematically investigates the impact of angular walls on the bubble dynamics within confined spaces. Based on the Kelvin impulse theory, the conformal transformation, and the image method, a theoretical model for a bubble oscillating near an angular wall within confined spaces is established. High-speed photography experiments are conducted to qualitatively analyze the typical bubble collapse phenomena. The mechanism of the fluid velocity and the Kelvin impulse affecting the bubble dynamics is discussed, and the effects of the angular wall on the bubble dynamics are quantitatively analyzed. The main conclusions are summarized as follows: (1) When the bubble oscillates near an angular wall, it exhibits a wide liquid jet. The width of the jet decreases as the bubble–wall distance increases, reflecting the diminishing influence of the angular wall on the bubble. (2) The bubble exhibits two typical splitting phenomena: equal splitting and unequal splitting, which occur at symmetric and asymmetric positions, respectively. The splitting phenomenon disappears in close proximity to the wall. (3) The inconsistency between the high-velocity liquid region and the Kelvin impulse distribution leads to the bubble unequal splitting.