Session: 06-15-03 Unsteady Hydrodynamics, Vibrations, Acoustics and Propulsion - III

Submission Number: 181364

Ultrafast Jet Dynamics From Two-Cavitation-Bubble Interactions with Different Sizes 

The dynamics of cavitation bubbles have attracted significant research interest in the field of marine engineering. This study numerically investigates the dynamics of liquid jets generated by the interaction of two cavitation bubbles with different sizes. By adjusting the time delay and the initial distance between the two cavitation bubbles, the jet tip morphology and velocity inside the larger bubble exhibit significant variations. We conduct numerical simulations based on the Volume of Fluid method and compare the results with existing experimental data. The comparison demonstrates a good agreement, as the simulations successfully reproduce key observables including the maximum bubble volume, pulsation period, and various jet tip morphologies. We find that the toroidal collapse of the smaller bubble can trigger the neck breakup, which induces the formation of an ultrafast jet in the larger bubble. Furthermore, we investigate the influence of the bubble size ratio on this jet acceleration. It is noteworthy that the smaller bubble cannot be arbitrarily small. When the size ratio of the two bubbles falls below a critical value, their interaction weakens significantly, thereby preventing the larger bubble from forming a high-speed liquid jet. This method of energy optimization may offer beneficial insights into the jet dynamics induced by cavitation bubbles.

Presenting Author: Shuai Yan Harbin Engineering University

Presenting Author Biography: Shuai Yan
Ph.D. Candidate, Harbin Engineering University
Research Areas: Bubble Dynamics, Bubble Jet Dynamics, Fluid-Structure Interaction

Authors:

Shuai Yan Harbin Engineering University
Rui Han Harbin Engineering University
Shuai Li Harbin Engineering University