Low-Frequency Acoustic Wave Generation in a Resonant Bubble Layer

O. A. Druzhinin¹, L. A.Ostrovsky², A. Prosperetti³

¹Institute of Applied Physics, 603600 Nizhni Novgorod, Russia
²University of Colorado, CIRES/NOAA, Environmental Technology Laboratory, Boulder CO 80303
³Department of Mechanical Engineering, The Johns Hopkins University, Baltimore MD 21218

ABSTRACT: The nonlinear response of a bubble layer subject to harmonic and biharmonic excitation at frequencies smaller than the bubble resonance frequency is considered. The nonlinear resonance properties of the layer and generation of difference-frequency signal are studied analytically and numerically. It is found that, for bubble volume fractions 10^-3 and pump amplitudes of the order of 10^-1 atm, the power of the low frequency signal (including waves radiated in both directions) may reach 10% of the total power of the incident biharmonic wave. The efficiency is restricted by the rapid formation of shocks already at relatively low driving amplitudes, which may not occur in a more completemodel accounting for the inertia of the bubble pulsations.

J. Acoust. Soc. Am. 100, 3570-3580, 1996


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