Cavity collapse near slot geometries

Andrews, Elijah D.; Rivas, David Fernández; Peters, Ivo R.

doi:10.1017/jfm.2020.552

Cited by 29 publications

(13 citation statements)

References 42 publications

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“…Up to now, owing to the large variety of structures and constraints, only a few cases were already investigated for single bubble dynamics. Among the solid boundaries and objects, there are a small hole [73], blind holes/crevices [74], rectangular channels [75], convex surfaces [10], a thin gap (parallel plates) [76,77], rigid spheres [78][79][80][81], a pencil-like electrode [82], ridges and grooves [83], a micro structured riblet [84], edges [85,86] and corners [87].…”

Section: When R *mentioning

confidence: 99%

Dynamics of a Laser-Induced Bubble above the Flat Top of a Solid Cylinder—Mushroom-Shaped Bubbles and the Fast Jet

Koch

Rosselló

Lechner

et al. 2021

Fluids

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The dynamics of a laser-induced bubble on top of a solid cylinder is studied both experimentally and numerically. When the bubble is generated close to the flat top along the axis of the cylinder and its maximum radius exceeds the one of the flat top surface, it collapses in the form of a mushroom with a footing on the cylinder, a long stem and a hat-like cap typical for a mushroom head. The head may collapse forming a thin, fast liquid jet into the stem, depending on bubble size and bubble distance to the top of the cylinder. Several experimental and numerical examples are given. The results represent a contribution to understand the behavior of bubbles collapsing close to structured surfaces and in particular, how thin, fast jets are generated.

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Section: When R *mentioning

confidence: 99%

Dynamics of a Laser-Induced Bubble above the Flat Top of a Solid Cylinder—Mushroom-Shaped Bubbles and the Fast Jet

Koch

Rosselló

Lechner

et al. 2021

Fluids

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“…There has been a recent effort to characterise single bubble collapse in a range of complex geometries. For example, characterising jet direction in a selection of geometries including in concave corners (Tagawa & Peters 2018), inside rectangular and triangular prisms (Molefe & Peters 2019), above slots (Andrews, Fernández Rivas & Peters 2020) and in the corner of a wall and a free surface (Kiyama et al. 2021).…”

Section: Introductionmentioning

confidence: 99%

Bubble collapse near porous plates

2023

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The collapse of a gas or vapour bubble near a non-porous boundary is directed at the boundary due to the asymmetry induced by the nearby boundary. High surface pressure and shear stress from this collapse can damage, or clean, the surface. A porous boundary, such as a filter, would act similarly to a non-porous boundary but with reduced asymmetry and thus reduced effect. Prior research has measured the cleaning effect of bubbles on filters using ultrasonic cleaning, but it is not known how the bubble dynamics are fundamentally affected by the porosity of the surface. We address this question experimentally by investigating how the standoff distance, porosity, pore size and pore shape affect two collapse properties: bubble displacement and bubble rebound size. We show that these properties depend primarily on the standoff distance and porosity of the boundary and extend a previously developed numerical model that approximates this behaviour. Using the numerical model in combination with experimental data, we show that bubble displacement and bubble rebound size each collapse onto respective single curves.

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“…The present investigations are also relevant to the dynamics of laser-induced cavitation bubbles in slot geometries. The motion of a cavitation bubble outside of the slot (a rectangular channel) was investigated by Andrews, Fernandez Rivas & Peters (2020). Here we extend their investigations to study the dynamics of the bubbles inside the slot as a potential mechanism of cavitation cleaning of a narrow space.…”

Section: Introductionmentioning

confidence: 99%

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

Brujan

Zhang²,

Liu³

et al. 2022

J. Fluid Mech.

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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.

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Cavity collapse near slot geometries

Abstract: Abstract

Cited by 29 publications

References 42 publications

Dynamics of a Laser-Induced Bubble above the Flat Top of a Solid Cylinder—Mushroom-Shaped Bubbles and the Fast Jet

Dynamics of a Laser-Induced Bubble above the Flat Top of a Solid Cylinder—Mushroom-Shaped Bubbles and the Fast Jet

Bubble collapse near porous plates

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

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