Abstract
Observations of air bubble growth in a quiescent liquid and in a liquid cross-flow by means of a high-speed camera and piezoelectric-hydrophone in a synchronous experimental setup are performed. Using the passive acoustical method, one observes a beat-wave phenomenon when the feed magnitude of liquid cross-flow is increased from 43 to 128mm/s and this is corroborated by the appearance of peaks in spectral and spectrogram analyses respectively. A fit to experimental data by a theoretical-model indicates that the beat-signal is the result of under and overdamped systems. The bubble video-images show the asymmetric travel of bubble-surface ripples after the neck collapse. The acoustic comparison exhibits a beat signal as a result of capillary – wave superposition, which is in agreement with earlier results on bubble fragmentation in a locally sheared flow.
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