Optical and acoustic investigations of the dynamics of laser-produced cavitation bubbles near a solid boundary

Abstract

The dynamics of laser-produced cavitation bubbles near a solid boundary and its dependence on the distance between bubble and wall are investigated experimentally. It is shown by means of high-speed photography with up to 1 million frames/s that jet and counterjet formation and the development of a ring vortex resulting from the jet flow are general features of the bubble dynamics near solid boundaries. The fluid velocity field in the vicinity of the cavitation bubble is determined with time-resolved particle image velocimetry. A comparison of path lines deduced from successive measurements shows good agreement with the results of numerical calculations by Kucera & Blake (1988). The pressure amplitude, the profile and the energy of the acoustic transients emitted during spherical bubble collapse and the collapse near a rigid boundary are measured with a hydrophone and an optical detection technique. Sound emission is the main damping mechanism in spherical bubble collapse, whereas it plays a minor part in the damping of aspherical collapse. The duration of the acoustic transients is 20-30 ns. The highest pressure amplitudes at the solid boundary have been found for bubbles attached to the boundary. The pressure inside the bubble and at the boundary reaches about 2.5 kbar when the maximum bubble radius is 3.5 mm. The results are discussed with respect to the mechanism of cavitation erosion.

Dynamics of laser-induced bubble pairs

“…The interaction of a bubble with its environment generically establishes an asymmetry that, for strong interaction, leads to jet formation, whereby the bubble pierces itself with a high-speed liquid jet. In the case of a bubble collapsing in a stationary liquid near a solid boundary, the jet is directed towards the boundary and reaches velocities of the order of 100 m s −1 (Benjamin & Ellis 1966;Plesset & Chapman 1971;Lauterborn & Bolle 1975;Blake, Taib & Doherty 1986;Tomita & Shima 1986;Blake & Gibson 1987;Vogel, Lauterborn & Timm 1989;Zhang, Duncan & Chahine 1993;Shaw et al 1996;Tong et al 1999;Brujan et al 2002;Popinet & Zaleski 2002;Lindau & Lauterborn 2003;Johnsen & Colonius 2009;Ochiai et al 2011). Jet formation is also observed with bubbles compressed by a shock wave (Bowden 1966;Dear, Field & Walton 1988;Bourne & Field 1992Antkowiak et al 2007;Hawker & Ventikos 2012).…”

Experimental Investigation of Acoustic and Cavitation Processes Generated by the Laser - Lithotripsy

“…Naud6 and Ellis [5], Plesset and Chapman [6], Blake, Taib and Doherty [7], Vogel, Lauterborn, Timm [3] and others have investigated cavitation processes with 7 > 0 above nearly infinite plane solid surfaces.…”

Effects of a uniform magnetic field on a growing or collapsing bubble in a weakly viscous conducting fluid

“…As is well known, the existence of a wall can significantly change the dynamics of a bubble, especially when the distance from the center of the bubble to the wall is in the order of the maximum bubble radius. 15 However, the presence of the wall can only complicate the analysis of the problem without aiding to the main objective of the present investigation.…”