title: Acoustically driven cavitation cluster collapse in planar geometry.
abstract: We demonstrate the dynamics of arrays of transient cavitation bubbles exposed to a sound field in a planar geometry. Single, double, and complex configurations of cavitation bubbles are obtained by shaping a pulsed laser beam with a digital hologram and focusing it into a thin gap of liquid. The liquid is driven with an oscillating pressure field of variable phase and amplitude. We compare the dynamics of a single bubble recorded with high-speed photography with a two-dimensional Rayleigh model. For multibubble configurations we observe bubble-bubble interaction and coalescence which depends on the phase of the acoustic field. Larger clusters demonstrate drastically enhanced collapse for high-amplitude driving, enabling the study of artificial cavitation clusters under strong driving.
authors.affiliation: School of Physical and Mathematical Sciences, Division of Physics and Applied Physics, Nanyang Technological University, Singapore, Singapore.
authors.forename: Ivan
authors.initials: I
authors.lastname: van der Kroon
authors.forename: Pedro A
authors.initials: PA
authors.lastname: Quinto-Su
authors.forename: Fenfang
authors.initials: F
authors.lastname: Li
authors.forename: Claus-Dieter
authors.initials: CD
authors.lastname: Ohl