Experimental and Numerical Study on the Bubble Dynamics near Two-Connected Walls with An Obtuse Angle

Li, Shimin; Cui, Pu; Zhang, Shuai; Li, Wentao; Peng, Yaoli

doi:10.1007/s13344-020-0075-8

Cited by 19 publications

(9 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is interesting to note here that a bubble generated near an obtuse-angled corner develops only an oblique jet towards the nearby wall of the corner, irrespective of the initial position of the bubble inside the corner (Cui et al 2020;Li et al 2020). For this particular situation, decomposition of the pressure gradients into their components results in a configuration in which the bubble is situated in two perpendicular pressure gradients.…”

Section: Numerical Simulationsmentioning

confidence: 82%

See 1 more Smart Citation

Jetting and migration of a laser-induced cavitation bubble in a rectangular channel

Brujan

Zhang²,

Liu³

et al. 2022

J. Fluid Mech.

View full text Add to dashboard Cite

The jetting behaviour and migratory characteristics of a laser-induced cavitation bubble in a rectangular channel are investigated both experimentally and numerically, for various combinations of the geometric and physical parameters of the system. High-speed photography is used to visualize the temporal development of the bubble shape, the formation of liquid jets during bubble collapse, and the bubble displacement in contact with the sidewalls of the channel during two oscillation cycles of the bubble. The bubble profiles, pressure contours and velocity vectors ambient to the bubble are obtained through numerical simulation results by using an Eulerian finite element method with a compressible liquid impact model. The jetting behaviour of the bubble varies between single jet formation and the formation of three liquid jets directed towards each wall of the channel. The numerical calculations indicate that the liquid jets directed towards the sidewalls of the channel reach maximum velocities of 100 m s−1 while the peak velocity of the liquid jet directed towards the channel endwall is about 55 m s−1. A small bubble generated close to a sidewall of the channel develops only a single inclined jet during collapse. Such jets can reach velocities of up to 110 m s−1. A bubble displacement in contact with the sidewalls of the channels of 350 μm was observed during the first two oscillation cycles for a bubble with a maximum diameter slightly smaller than the height of the channel. The results of our investigations are compared to previous results obtained in similar configurations.

show abstract

Section: Numerical Simulationsmentioning

confidence: 82%

“…2020; Li et al. 2020). For this particular situation, decomposition of the pressure gradients into their components results in a configuration in which the bubble is situated in two perpendicular pressure gradients.…”

Section: Comparison With Similar Configurationsmentioning

confidence: 99%

Jetting and migration of a laser-induced cavitation bubble in a rectangular channel

Brujan

Zhang²,

Liu³

et al. 2022

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…Similar features have been discussed in detail previously. 43 As c b increases, there is no longer a peak at the bisector, because the bubble pulsation becomes closer to that in a free field, and the jet volume and relative volume are both smaller than near the walls owing to the weak secondary Bjerknes force. Therefore, a peak in the relative jet volume only occurs in the corner bisector as the initial bubble approaches the corner, when the standoff distance is around 2.…”

Section: 0mentioning

confidence: 97%

“…In most cases of practical interest, more than one wall is present, and therefore, bubble dynamics near multiple walls have received much attention in recent years. [43][44][45][46][47][48] However, most of these studies have focused on aspects of bubble dynamics relevant to cavitation, medicine, and ultrasonic cleaning, and have ignored the effects of buoyancy. For a bubble subject to buoyancy, the jet may not necessarily point toward the wall, and it is important to take this into account, since the characteristics of the jet depend on its direction.…”

Section: Introductionmentioning

confidence: 99%

“…For a bubble subject to buoyancy, the jet may not necessarily point toward the wall, and it is important to take this into account, since the characteristics of the jet depend on its direction. In our previous work, 43,[49][50][51] we have shown that the jet direction near complex boundaries changes significantly when the effect of buoyancy is taken into account. However, those studies focused primarily on the analysis of specific cases and the description of physical phenomena.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of a buoyant pulsating bubble near two crossed walls

Liu

Wang

et al. 2021

Physics of Fluids

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Theoretical study on bubble dynamics under hybrid-boundary and multi-bubble conditions using the unified equation

Zhang,

Li,

Cui

et al. 2023

Sci. China Phys. Mech. Astron.

Self Cite

View full text Add to dashboard Cite

This paper aims to use the unified bubble dynamics equation to investigate bubble behavior in complex scenarios involving hybrid free surface/wall boundaries and interactions between multiple bubbles. The effect of singularity movement on the unified equation’s form is analyzed after deriving the bubble pulsation equation using a moving point source and a dipole, followed by discussions on the effect of migration compressibility-related terms on the bubble dynamics. In addition, the present study accounts for the impact of hybrid boundaries, including crossed and parallel boundaries, by introducing a finite number of mirror bubbles for the former and an infinite number of mirror bubbles for the latter. Spark bubble experiments and numerical simulation are conducted to validate the present theory. The application of the unified equation in multi-bubble interactions is exemplified by computing a spherical bubble array containing more than 100 uniformly distributed cavitation bubbles under different boundary conditions. The bubble cluster-induced pressure peak can reach nearly two times or even higher than that of an individual bubble, highlighting the damage potential caused by cavitation bubble clusters.

show abstract

Experimental and Numerical Study on the Bubble Dynamics near Two-Connected Walls with An Obtuse Angle

Cited by 19 publications

References 36 publications

Jetting and migration of a laser-induced cavitation bubble in a rectangular channel

Jetting and migration of a laser-induced cavitation bubble in a rectangular channel

Dynamics of a buoyant pulsating bubble near two crossed walls

Theoretical study on bubble dynamics under hybrid-boundary and multi-bubble conditions using the unified equation

Contact Info

Product

Resources

About