Abstract:

Using a 1-D approximation, processes are numerically simulated that take place during oscillations of a single gas bubble located in the center of a spherical flask with liquid exposed to a periodical acoustic wave. Real equations of state for water, gases (air, argon), surface tension, and heat conduction (molecular and radiative) are taken into account in the simulation. The role of shock-wave processes at bubble compression is investigated. Because of the peculiarities in the behavior of the gas, the equation of state is shown to be the most important at densities greater than 1 g/cm[sup 3], with the parameters of bubble compression being weakly affected by the water equation of state. Time dependencies of the bubble radius during one acoustic cycle are obtained for different ambient conditions: acoustic-wave amplitude and frequency, liquid temperature, and magnitude of surface tension. Comparison with experimental data is performed. [Work supported by CRDF.]