Abstract:

There is a new interest to study caviation phenomena for gas-filled bubble in liquid basing on recent experimental and theoretical results on single-bubble sonoluminescene. Scaling analysis is applied to these phenomena. It allows a role of main control parameters to be clarified which have an influence on energy transfer to central gas-filled cavity and on energy dissipation in gas. The main parameters are linear dimensions, initial equilibrium pressure, initial temperature, rate and amplitude of pressure change. Of principle importance are convergent symmetry parameters and time-shape for external pressure. The most important are phenomena which provide maximum energy transfer to a central bubble, and to internal gas layers in the bubble. Factors decreasing efficiency of energy transfer are shown. The main factors are (1) compressibility of liquid caused by additional energy dissipation in layers adjacent to bubble; (2) early origin of shock wave near gas--liquid boundary. Theoretical estimations are confirmed by simulations calibrated on single bubble sonoluminescence. Criteria are shown to optimize gas compression in bubble. There are proposed prospective experiments to study large-scale effects in systems with external size of few meters and equilibrium pressure of several kilobars. [Work supported by the CRDF.]