Dynamics of Laser-Induced Cavitation Bubble near Solid Boundary

Abstract

The dynamics of a laser-induced cavitation bubble created near solid boundary is investigated using a new force sensor together with a hydrophone. The experimental results indicate that liquid-jet formation and acoustic transient emission are general features of bubble dynamics; liquid-jet formation occurs earlier than that of the acoustic transient. A comparison of the liquid jet energy and acoustic energy reveals that the acoustic transient, rather than the liquid jet, plays a vital role in the damping mechanism during the second collapse for γ=0.75 (γ=L/Rmax, where Rmax being the maximum bubble radius and L denoting the distance of the cavity inception from the boundary); moreover, the amplitudes of acoustic transients and liquid jet versus the nondimensional distance γ are also derived, which are valuable in hydraulic cavitation, laser lithotripsy and laser ophthalmology.