Abstract
We consider parametrically stimulated viscous damping of bubble oscillations in a liquid. Monopole bubble oscillations in relatively strong acoustic fields can generate parametrically bubble shape oscillations–higher modes. The higher modes attenuate effectively due to liquid viscosity. Thus, if the amplitude of the sound field exceeds the threshold of parametric excitation of higher modes the energy of bubble monopole oscillations can be transferred into the higher modes where it is dissipated. This mechanism is studied in the present paper. A nonlinear set of equations for amplitudes of bubble oscillation modes are derived and investigated. Thresholds of parametric excitation of higher modes are estimated. The effective parameter of energy dissipation is obtained and the parametrically stimulated energy losses for monopole bubble oscillations are evaluated for some particular cases. It is shown that due to the stimulated viscosity the amplitude of the monopole bubble oscillations saturates with the incr...
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