Amplitude Modulation of a Stationary Acoustic Field by Cavitation Bubbles
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The paper concerns the effects of cavitation-induced bubbles in amplitude modulating a medium intensity from about 0.02 bar rms to about 0.15 bar rms standing wave field. The bubbles, after generation, are trapped at the nodes or anti-nodes of an acoustic standing wave field, and at sufficiently high driving levels dance around and act as sound scatterers. The constant generation, growth in size, dancing about and eventual escape of the trapped bubbles causes the scattered acoustic energy to modulate randomly the exciting carrier signal. The purpose of this research was to measure the frequency spectra for this random modulation signal.
- Fluid Mechanics