Numerical simulation of planar liquid jets from collapsing bubbles in a U-shaped wall

Abstract

The present study deals with the dynamics of a laser-induced cavitation bubble generated in the middle of two parallel horizontal rigid walls which are closed at one end with a vertical rigid wall by using a boundary element method with an incompressible formulation. A complex jetting behavior depends on the relative size of the bubble with respect to the distance between the parallel walls and the initial location of the bubble from the vertical rigid wall. A bubble generated far from the vertical rigid wall develops a radial jet during its collapse phase, which leading to bubble splitting. When the bubble is generated close to the vertical rigid wall, a planar jet is formed during bubble collapse which is towards the vertical rigid wall. A larger size of the parallel walls results in an increase of the bubble oscillation period. Nevertheless, the bubble shape and jet formation are not affected by the size of the parallel walls.