title: The effect of static pressure on the strength of inertial cavitation events.
abstract: Recent investigations of cavitation in fluids pressurized up to 30 MPa found that the intensity of light emissions increased by 1000-fold over that measured for single bubble sonoluminescence. A series of measurements is reported here to extend this original work by resolving the static pressure dependence of the shock wave and light emissions from the first and the most energetic collapses, along with the total shock wave energy and light emissions for the event. Each of these parameters was found to increase with the static pressure of the fluid. Furthermore, the energy of these shock wave and light emissions was found to increase in proportion to the stored acoustic energy in the system. These findings were corroborated using the Gilmore equation to numerically compute the work done by the liquid during the bubble collapse. The overall findings suggest that the increased collapse strength at high static pressure is due to the increased tension required to generate inertial cavitation, and not an increased pressure gradient between the interior of the vaporous bubble and the surrounding liquid.
authors.affiliation: Department of Physics, National Center for Physical Acoustics, University of Mississippi, 1 Coliseum Drive, University, Mississippi 38677, USA. kenneth.bader@uc.edu
authors.forename: Kenneth B
authors.initials: KB
authors.lastname: Bader
authors.forename: Joel
authors.initials: J
authors.lastname: Mobley
authors.forename: Charles C
authors.initials: CC
authors.lastname: Church
authors.forename: D Felipe
authors.initials: DF
authors.lastname: Gaitan
mesh_terms: D003198:Computer Simulation; D005740:Gases; D019220:High-Energy Shock Waves; D008027:Light; D016014:Linear Models; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D011312:Pressure; D013500:Surface Tension; D014465:Ultrasonics / Q000295:instrumentation; D014732:Vibration; D014867:Water
chemical_list: D005740:Gases; D014867:Water