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

Brujan, Emil-Alexandru; Zhang, A-Man; Liu, Yunlong; Ogasawara, Toshiyuki; Takahira, Hiroyuki

doi:10.1017/jfm.2022.695

Cited by 30 publications

(8 citation statements)

References 45 publications

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“…d/R max ) is no longer sufficient to fully characterise the system. The same situation arises in cases where the bubbles are produced in a constricted space, for example, in narrow channels (Gonzalez-Avila et al 2011;Wang et al 2018;Brujan et al 2022), between two surfaces (Li et al 2017;Liu et al 2017), in a liquid column (Robert et al 2007) or inside a drop (Obreschkow et al 2006;Thoroddsen et al 2009;Marston & Thoroddsen 2015;Gonzalez-Avila & Ohl 2016;Zeng et al 2018).…”

Section: Introductionmentioning

confidence: 87%

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: 87%

Bubble nucleation and jetting inside a millimetric droplet

et al. 2023

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“…2018; Brujan, Hiroyuki & Toshiyuki 2019; Brujan et al. 2022). These parametric studies provide references for quantifying the collapse characteristics of bubbles, but no buoyant bubbles are involved in their works.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on the interaction between the bubble and nearby structures below the free surface have paid more attention to the physical phenomena in some specific engineering scenarios, such as the rise and fall of the free surface (Liu et al 2016;Zhang et al 2017), interaction between the bubble and a vessel (Klaseboer, Khoo & Hung 2005b;Zhang & Zong 2011;Zhang, Zong & Zhang 2014), and deformation of the floating structure caused by bubble pulsations (Klaseboer et al 2005a;Zong et al 2015). 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 2022). These parametric studies provide references for quantifying the collapse characteristics of bubbles, but no buoyant bubbles are involved in their works.…”

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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“…2022), inside a slot (Brujan et al. 2022), on a convex corner (Zhang et al. 2020), on a crevice (Trummler et al.…”

Section: Introductionmentioning

confidence: 99%

“…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). Bubble morphology, flow properties and jetting behaviours have also been investigated in combinations of concave corners and free surfaces (Zhang et al 2017;Brujan et al 2018), between two parallel rigid boundaries (Brujan, Takahira & Ogasawara 2019;Rodriguez et al 2022), inside a slot (Brujan et al 2022), on a convex corner (Zhang et al 2020), on a crevice (Trummler et al 2020) and on ridge-patterned structures (Kim & Kim 2020;Kadivar, el Moctar & Sagar 2022). Nevertheless, there remain fundamental complex geometries that have yet to be explored.…”

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

Cited by 30 publications

References 45 publications

Bubble nucleation and jetting inside a millimetric droplet

Bubble nucleation and jetting inside a millimetric droplet

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

Bubble collapse near porous plates

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