Robert Mettin: abstract VSTML03

Secondary acoustic waves in a polydisperse bubbly medium

D. V. Voronin(1), G. N. Sankin(1), V. S. Teslenko(1), R. Mettin(2), and W. Lauternborn(2)

(1) Lavrentyev Institute of Hydrodynamics,
pr. ac. Lavrentyeva, 15, 630090 Novosibirsk, Russia

(2) Drittes Physikalisches Institut, Universität Göttingen,
Bürgerstraße 42-44, D-37073 Göttingen, Germany


Abstract

Wave interaction of bubbles in a cavitation cluster is studied theoretically and experimentally. It is found that two groups of bubbles with different phases of oscillations and collapse times are formed at the early stage of bubble-cluster formation. It is shown that small bubbles accumulating energy in the initial pulsed acoustic wave collapse in the field of internal positive pressure of the cluster. A secondary compression wave generated by inertial expansion of large bubbles is determined by means of numerical simulations and registered experimentally. The amplitude of this wave is comparable to the amplitude of the initial pulse. A decrease in the oscillaton period and strengthening of the microbubble collapse are observed in the cluster under pulsed compression.


J. Appl. Mech. and Tech. Phys. 44, 17-26 (2003)


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