Determining the bubble cap film thickness of bursting bubbles from their acoustic emissions

TitleDetermining the bubble cap film thickness of bursting bubbles from their acoustic emissions
Publication TypeJournal Article
Year of Publication2013
AuthorsDeane GB
JournalThe Journal of the Acoustical Society of America
Volume133
PaginationEL69-EL75
Date Published2013/04
Type of ArticleJournal Article
Keywordsacoustic emission; acoustic resonance; bubbles; Helmholtz equations; underwater sound
Abstract

A study of the sound generated by 2.5 mm radius bubbles bursting on the surface of fresh water is presented. The sound pulses are found to be sensitive to the time interval between the bubble reaching the water surface and bursting. Bubbles that burst within a few 10's of milliseconds behave like a Helmholtz resonator and radiate a swept chirp pulse. Bubbles that persist for 100's of milliseconds or more exhibit more complex acoustic behavior. An analysis of the resonator behavior provides an estimate of the film thickness in reasonable agreement with a fluid drainage model.

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