Collapse and rebound of a laser-induced cavitation bubble

Abstract

A strong laser pulse that is focused into a liquid produces a vapor cavity, which first expands and then collapses with subsequent rebounds. In this paper a mathematical model of the spherically symmetric motion of a laser-induced bubble is proposed. It describes gas and liquid dynamics including compressibility, heat, and mass transfer effects and nonequilibrium processes of evaporation and condensation on the bubble wall. It accounts also for the occurrence of supercritical conditions at collapse. Numerical investigations of the collapse and first rebound have been carried out for different bubble sizes. The results show a fairly good agreement with experimental measurements of the bubble radius evolution and the intensity of the outgoing shock wave emitted at collapse. Calculations with a small amount of noncondensable gas inside the bubble show its strong influence on the dynamics.

Dynamics of laser-induced bubble pairs

“…For instance, in the time interval between 80 and 100 µs during which the jet impact occurs in the simulations of figure 15, the average gas pressure in bubble 2 is of the order of 0.2 bar. That is about eight times larger than the equilibrium water vapour pressure at room temperature, which is usually assumed to prevail in an expanded cavitation bubble (Akhatov et al 2001). Therefore, we refrain from quoting explicit values of the gas pressure and only describe the general features of the gas flow accompanying jet formation.…”

“…Since the jet impact occurs when bubble 2 is maximally expanded, the bubble pressure will probably be close to the equilibrium water vapour pressure at room temperature, i.e. of the order of 25 mbar (Akhatov et al 2001). Therefore, jet entry will differ from the impact of a liquid jet onto a water surface in air (Kersten, Ohl & Prosperetti 2003).…”

“…Dynamics of laser-induced bubble pairs 707 et al 1992; Putterman & Weninger 2000;Akhatov et al 2001;Brenner, Hilgenfeldt & Lohse 2002;Suslick & Flannigan 2008;Lauterborn & Kurz 2010;Schanz et al 2012). However, spherical-bubble collapse requires isotropic bubble surroundings and inherent stability conditions to be fulfilled with respect to spherical shape (parametric and Rayleigh-Taylor instability) (Plesset 1954;Strube 1971;Hilgenfeldt, Lohse & Brenner 1996;Ohl, Lindau & Lauterborn 1998;Lauterborn et al 1999;Ohl et al 1999;Lin, Storey & Szeri 2002;Koch et al 2011).…”

Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems

“…Different and more sophisticated variants of equation (5.9) are available in the literature to take into account other effects, such as: the evaporation and diffusion flow rates of vapour and gas through the bubble walls [79,103,104], temperature discontinuity at the bubble surface between the aeriform constituents and the liquid phase [105], the kinematic slip condition between the liquid and vapour phases [105,106] as well as liquid compressibility [107,108]. The temperature, pressure and velocity differences between the different phases can be simulated in two-phase models, in which a Rayleigh-Plesset-type equation is coupled to the mass and momentum conservation and partial differential equations for each distinct phase [11].…”

Cavitation bubble dynamics during pulsed laser ablation of a metallic glass in water

“…This intriguing phenomenon has versa-tile applications ranging from nanoparticle synthesis [1,2], surface cleaning [3] to luminescence [4]. The dynamics of cavitation bubble is of central importance since it reflects the fundamental response of liquid-plasma-solid system to laser ablation, and thus has drawn increasing interest [5][6][7][8]. Usually, the conventional Rayleigh-Plesset (R-P) theory is modified to reproduce the ablation-induced bubble dynamics.…”