Evolution of a Small Distortion of the Spherical Shape of a Gas Bubble under Strong Expansion-Compression

  • A. A. Aganin
  • T. S. Guseva


The evolution of a small distortion of the spherical shape of a gas bubble which undergoes strong radial expansion-compression upon a single oscillation of the ambient liquid pressure under a harmonic law are analyzed by numerical experiments. It is assumed that the distortions of the spherical bubble shape are axisymmetric and have the form of individual spherical surface harmonics with numbers of 2–5. Bubble-shape oscillations prior to the beginning of expansion are taken into account. Generally, the distortion value during bubble expansion-compression depends on the phase of bubble-shape oscillation at the beginning of the expansion (initial phase). Emphasis is placed on the dependence of the maximum distortions in the initial phase at certain characteristic times of bubble expansion-compression on the amplitude of the external excitation, liquid viscosity, and distortion mode (harmonic number). The parameters of the problem are typical of the stable periodic sonolumiescence of an individual air bubble in water at room temperature. An exception is the liquid pressure oscillation amplitude, which is varied up to values that are five times the static pressure. That large excitation amplitudes are beyond the stability threshold of periodic oscillations of spherical bubbles. Their consideration is of interest from the point of view of increasing the compression ratio of the bubble gas, i. e., increasing the maximum temperature and density achievable in the final compression stage.

Key words

bubble dynamics distortion of the spherical shape oscillations sonoluminescence 


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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • A. A. Aganin
    • 1
  • T. S. Guseva
    • 1
  1. 1.Institute of Mechanics and Engineering, Kazan’ Science CenterRussian Academy of SciencesKazan’Russia

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