The Journal of the Acoustical Society of America · 1959 · 300 citations · 0 references
Natural SciencesPhysicsAcousticsFluid DynamicsFluid MechanicsAcoustic Wave PropagationBubble DynamicsCavitationHydrodynamic StabilityVorticity DynamicsAcoustic CavitationCavitation Bubble DynamicsCavitation DynamicsCavitation ExperimentsCavitation ModelingCavitation StabilityTransient CavitationTransition Between Stable Regimes
The study aims to determine which physical assumptions and approximations are suitable for modeling cavitation microstreaming, particularly for bubbles near solid boundaries. The authors conducted systematic experiments varying sound amplitude and other parameters to map the dependence of microstreaming on these factors. They found that streaming changes discontinuously through several stable regimes as sound amplitude varies, requiring different boundary conditions for vorticity generation, and that Nyborg’s model applies to at least one regime, matching experimental velocities.
In the research reported here an attempt has been made to discover by experiment what physical assumptions and approximations are appropriate in the theory of cavitation microstreaming, especially for cavitation bubbles located near solid boundaries. A systematic investigation of the phenomenon has been made and its dependence on certain parameters (e.g., amplitude of sound) has been determined. The investigation has disclosed that as the sound amplitude is varied, other conditions remaining the same, the streaming changes discontinuously through several stable regimes. It appears that in order to account for the generation of vorticity one needs to assume different conditions at the boundaries for each regime. For at least one regime, a theoretical model due to Nyborg seems to be applicable; comparison made with experimentally determined streaming velocities.