Effects of the non-equilibrium condensation of vapour on the pressure wave produced by the collapse of a bubble in a liquid

Fujikawa, Shigeo; Akamatsu, Teruaki

doi:10.1017/s0022112080002662

Cited by 406 publications

(233 citation statements)

References 26 publications

(7 reference statements)

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“…31. This is consistent with the theoretical model of Fujikawa and Akamatsu, 32 which includes the effects of compressibility of the liquid, non-equilibrium condensation of the vapour, heat conduction, temperature discontinuity at the phase interface, and the emission of shock waves. The presence of a solid boundary has shown to greatly affect the bubble shape and dynamics, for example, bubble collapse may produce water jets aimed towards the substrate.…”

Section: Resultssupporting

confidence: 88%

Optic cavitation with CW lasers: A review

et al. 2014

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The most common method to generate optic cavitation involves the focusing of short-pulsed lasers in a transparent liquid media. In this work, we review a novel method of optic cavitation that uses low power CW lasers incident in highly absorbing liquids. This novel method of cavitation is called thermocavitation. Light absorbed heats up the liquid beyond its boiling temperature (spinodal limit) in a time span of microseconds to milliseconds (depending on the optical intensity). Once the liquid is heated up to its spinodal limit (∼300 °C for pure water), the superheated water becomes unstable to random density fluctuations and an explosive phase transition to vapor takes place producing a fast-expanding vapor bubble. Eventually, the bubble collapses emitting a strong shock-wave. The bubble is always attached to the surface taking a semi-spherical shape, in contrast to that produced by pulsed lasers in transparent liquids, where the bubble is produced at the focal point. Using high speed video (105 frames/s), we study the bubble’s dynamic behavior. Finally, we show that heat diffusion determines the water superheated volume and, therefore, the amplitude of the shock wave. A full experimental characterization of thermocavitation is described.

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Section: Resultssupporting

confidence: 88%

Optic cavitation with CW lasers: A review

et al. 2014

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“…Fujikawa & Akamatsu 1980;Prosperetti & Plesset 1984;Yasui 1997;Storey & Szeri 2000;Marek & Straub 2001;Müller et al 2009;Dreyer et al 2012;Lauer et al 2012;Schanz et al 2012;Ishiyama et al 2013;Zein, Hantke & Warnecke 2013;Lotfi, Vrabec & Fischer 2014). The simulations assume an initial bubble size larger than the laser plasma to arrive at the experimental maximum bubble radii.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of laser-induced bubble pairs

et al. 2015

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The interaction of two laser-induced bubbles in bulk water is investigated. The strength and direction of the emerging liquid jets can be controlled by adjusting the relative bubble positions, the time difference between bubble generation, and the laser pulse energies determining the bubble sizes. Experimental and numerical studies are performed for millimetre-sized bubble pairs. Taking bubbles of equal energy, a maximum jet velocity is found for close anti-phase bubbles, i.e. when the second bubble is produced at the maximum volume of the first one and the bubble walls are almost touching and not merging. Under these conditions, one bubble produces a fast jet with a peak velocity of about 150 m s −1 that reaches a distance into the surrounding liquid of at least three times the maximum bubble radius. Collapse of the other bubble results in a slow jet of large mass that rapidly converts into a ring vortex. Correspondingly, the interaction with adjacent structures is dominated either by localized jet impact or by shear stresses extending over a larger area. Furthermore, interactions between micrometre-sized bubble pairs are investigated numerically to understand and predict how the effects of the physical parameters on bubble dynamics would change when the bubbles become smaller. The results are discussed with respect to micropumping and opto-injection.

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“…σ sf is the surface tension constant, κ sf is local surface curvature and n x , n y , n z are the unit normal at the droplet interface. Phase change model m  in source term S m due to the evaporation and condensation is modeled by using the equation for vapor-liquid mixture [11] based on the theory of evaporation/condensation on a plane surface [12] , ) (…”

Section: Governing Equations In Fluidmentioning

confidence: 99%

Numerical Analysis of Damping Effect of Liquid Film on Material in High Speed Liquid Droplet Impingement

Sasaki

Ochiai

Iga

2016

International Journal of Fluid Machinery and Systems

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By high speed Liquid Droplet Impingement (LDI) on material, fluid systems are seriously damaged, therefore, it is important for the solution of the erosion problem of fluid systems to consider the effect of material in LDI. In this study, by using an in-house fluid/material two-way coupled method which considers reflection and transmission of pressure, stress and velocity on the fluid/material interface, high-speed LDI on wet/dry material surface is simulated. As a result, in the case of LDI on wet surface, maximum equivalent stress are less than those of dry surface due to damping effect of liquid film. Empirical formula of the damping effect function is formulated with the fluid factors of LDI, which are impingement velocity, droplet diameter and thickness of liquid film on material surface.

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Effects of the non-equilibrium condensation of vapour on the pressure wave produced by the collapse of a bubble in a liquid

Cited by 406 publications

References 26 publications

Optic cavitation with CW lasers: A review

Optic cavitation with CW lasers: A review

Dynamics of laser-induced bubble pairs

Numerical Analysis of Damping Effect of Liquid Film on Material in High Speed Liquid Droplet Impingement

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