Nonlinear, low-frequency sound generation in a bubble layer: Theory and laboratory experiment

Lev A. Ostrovsky, Alexander M. Sutin, Irina A. Soustova, Alexander I. Matveyev, Andrey I. Potapov

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The difference-frequency sound generation as a result of interaction of two high-frequency harmonic waves in a bubble layer in water is investigated both theoretically and experimentally. Because the sound speed in the layer is less than that outside, the layer has resonance properties. As was shown before, this can considerably increase the efficiency of the nonlinear frequency transformation. However, unlike the cases considered before, the layer resonance is practically achievable only at the low (difference) frequency, whereas the high-frequency signal (pump) resonates at individual bubbles and then it strongly dissipates. Here the results of an experiment with a bubble layer with a thickness of about 10 cm in an anechoic tank are presented. One of the incident (primary) wave frequencies was 60 kHz, whereas the other could be varied, thus providing the low-frequency signal in the range of 0.8-14.8 kHz. Due to the first-mode layer resonance, this secondary signal had a pronounced maximum at a frequency of 2.4 kHz. The high attenuation of pump waves was due to resonant bubbles. A theory which agrees with the experimental results reasonably well, is developed for this type of interaction.

Original languageEnglish
Pages (from-to)722-726
Number of pages5
JournalJournal of the Acoustical Society of America
Volume104
Issue number2 I
DOIs
StatePublished - 1998

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