Direction of the microjet produced by the collapse of a cavitation bubble located in a corner of a wall and a free surface

Kiyama, Akihito; Shimazaki, Takaaki; Gordillo, José Manuel; Tagawa, Yoshiyuki

doi:10.1103/physrevfluids.6.083601

Cited by 25 publications

(9 citation statements)

References 23 publications

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“…In real-world conditions the boundary is of finite extent and the cavity may be spuriously affected by more than a single boundary (for instance, the walls of a container or the liquid free surface), exerting a considerable influence on the direction of the jetting (Kiyama et al. 2021; Andrews & Peters 2022).…”

Section: Introductionmentioning

confidence: 99%

Bubble nucleation and jetting inside a millimetric droplet

et al. 2023

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In this work we present experiments and simulations on the nucleation and successive dynamics of laser-induced bubbles inside liquid droplets in free-fall motion, i.e. a case where the bubbles are subjected to the influence of a free boundary in all directions. Within this spherical millimetric droplet, we have investigated the nucleation of secondary bubbles induced by the rarefaction wave that is produced when the shock wave emitted by the laser-induced plasma reflects at the drop surface. Interestingly, three-dimensional clusters of cavitation bubbles are observed. Their shape is compared with the negative pressure distribution computed with a computational fluid dynamics model and allows us to estimate a cavitation threshold value. In particular, we observed that the focusing of the waves in the vicinity of the free surface can give rise to explosive cavitation events that end up in fast liquid ejections. High-speed recordings of the drop/bubble dynamics are complemented by the velocity and pressure fields simulated for the same initial conditions. The effect of the proximity of a curved free surface on the jetting dynamics of the bubbles was qualitatively assessed by classifying the cavitation events using a non-dimensional stand-off parameter ${\Upsilon\hskip -1,05em -\,}$ that depends on the drop size, the bubble maximum radius and the relative position of the bubble inside the drop. Additionally, we studied the role of the drop's curvature by implementing a structural similarity algorithm to compare cases with bubbles produced near a flat surface to the bubbles inside the drop. Interestingly, this quantitative comparison method indicated the existence of equivalent stand-off distances at which bubbles influenced by different boundaries behave in a very similar way. The oscillation of the laser-induced bubbles promotes the onset of Rayleigh–Taylor and Rayleigh–Plateau instabilities, observed on the drop's surface. This phenomenon was studied by varying the ratio of the maximum radii of the bubble and the drop. The specific mechanisms leading to the destabilisation of the droplet surface were identified.

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Section: Introductionmentioning

confidence: 99%

Bubble nucleation and jetting inside a millimetric droplet

et al. 2023

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“…When solid boundaries are present the effects of geometry can be significant [58] , [59] , [60] , and even small changes in the system’s geometry can change the entire flow pattern and the resulting cleaning effectiveness of the cavitation [30] . The shock waves emitted during the bubble collapse get reflected or scattered from the solid boundaries and will, depending on the geometry, either diverge or refocus and cause formation of secondary cavitation bubbles.…”

Section: Introductionmentioning

confidence: 99%

The evolution of cavitation in narrow soft-solid wedge geometry mimicking periodontal and peri-implant pockets

Jezeršek

Molan

Terlep

et al. 2023

Ultrasonics Sonochemistry

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“…Some parametric analysis of the bubble collapse has been conducted: Kiyama et al. (2021) and Tagawa & Peters (2018) used the method of images to develop a theoretical model for determining the jet direction when a cavity is near a corner; Molefe & Peters (2019) studied the jet direction when a cavity is within rectangular and triangular channels; Andrews, Rivas & Peters (2020) predicted the jet direction near a slot with the boundary integral method (BIM); and Brujan conducted comprehensive studies on the corner of two or three rigid boundaries (Brujan et al. 2018; Brujan, Hiroyuki & Toshiyuki 2019; Brujan et al.…”

Section: Introductionmentioning

confidence: 99%

Vertically neutral collapse of a pulsating bubble at the corner of a free surface and a rigid wall

Zhang

Cui

et al. 2023

J. Fluid Mech.

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Vertically neutral collapse of a pulsating bubble occurs when the boundaries above or below the bubble balance the buoyancy effect over a pulsation. In this study, the vertically neutral collapse of a bubble near a vertical rigid wall below the free surface is investigated. The boundary integral method (BIM) is employed to model the bubble dynamics with an open-domain free surface. Moreover, this method is validated against several buoyant bubble experiments. Bubble dynamics in such conditions are associated with three dimensionless parameters: the bubble-free surface distance $\gamma _{{f}}$ , bubble–wall distance $\gamma _{{w}}$ and buoyancy parameter $\delta$ . We derive the Kelvin impulse of a spherical bubble and the algebraic relationship for vertically neutral collapse, which proves to be accurate for predicting vertically neutral collapse when the bubble is relatively far from the boundaries. Four patterns of the vertically neutral collapse of the bubble for different $\gamma _{{w}}$ and $\gamma _{{f}}$ are identified: (i) formally downward jet; (ii) annular collapse; (iii) horizontal jet; and (iv) weak jet. Despite the downward jet shape, the ‘formally downward jet’ is in the vertically neutral collapse state in terms of the profile of toroidal bubbles and the orientation of local high-pressure zones around the bubble at jet impact. A bulge with a high curvature above the bubble in the ‘annular collapse’ pattern is formed during bubble collapse under two local high-pressure zones at the left and right extremities of the bubble. The ‘horizontal jet’ pattern has the greatest potential to attack the wall, and the power laws of the moment of the jet impact, jet velocity and bubble displacement with respect to the theoretical Kelvin impulse are discussed. In particular, we quantitatively illustrate the role of the free surface on bubble migration towards the wall through the variational power-law exponents of the bubble displacement with respect to $\gamma _{{w}}$ .

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Direction of the microjet produced by the collapse of a cavitation bubble located in a corner of a wall and a free surface

Cited by 25 publications

References 23 publications

Bubble nucleation and jetting inside a millimetric droplet

Bubble nucleation and jetting inside a millimetric droplet

The evolution of cavitation in narrow soft-solid wedge geometry mimicking periodontal and peri-implant pockets

Vertically neutral collapse of a pulsating bubble at the corner of a free surface and a rigid wall

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