Dynamics of a buoyant pulsating bubble near two crossed walls

Shi Min Li, Yun Long Liu*, Qianxi Wang, A. Man Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
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Abstract

The dynamics of a buoyant pulsating bubble near two crossed perpendicular rigid boundaries (a horizontal and a vertical wall) are studied using the boundary element method combined with the method of mirror images. The Kelvin impulse and the elastic mesh velocity method are used to calculate the direction and volume of the liquid jet generated during bubble collapse. The numerical results show good agreement with experiments. An increase in buoyancy causes a local high-pressure zone at the root of the jet to move toward the bottom of the bubble, causing the jet to rotate upward toward the vertical wall. At a certain position, with the change in buoyancy, the dimensionless bubble volume at the instant of jet impact reaches a minimum when the jet direction is horizontal, with a peak in the dimensionless jet velocity occurring. A comprehensive parametric study of jet characteristics, including jet direction, velocity, and relative volume (the volume ratio of the jet to the bubble at the instant of jet impact), is carried out in terms of buoyancy and the standoff distances to the two walls. The Blake criterion can be used to judge whether a bubble jet is pointing obliquely upward or downward, provided that it deviates significantly from the horizontal direction. Depending on the buoyancy, the jet characteristics at different standoff distances are found to exhibit three distinct patterns of behavior. Finally, we discuss the changes in the jet velocity and relative volume as the buoyancy is varied.

Original languageEnglish
Article number073310
JournalPhysics of Fluids
Volume33
Issue number7
DOIs
Publication statusPublished - 15 Jul 2021

Bibliographical note

Funding Information:
This work was funded by the National Natural Science Foundation of China (Nos. 51879050 and 52088102). The first author would like to express sincere thanks to Dr. Nian-Nian Liu and Dr. Ming-Kang Li for their help in experiments and Mr. Zhen-Yu Hu for communication on manuscript writing.

Publisher Copyright:
© 2021 Author(s).

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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