INVESTIGATION OF THE ACOUSTIC PROPERTIES OF AIR BUBBLES IN WATER.
STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB
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An experimental facility and related techniques are described, and data are presented which were obtained in a study of sound generated by a single gas bubble excited when passing through a pressure field generated by the geometry of the duct. The sound was detected by a newly developed annular hydrophone, and amplified and recorded on strip chart by means of a high-frequency galvanometer. The resonant frequency of the excited bubble is found to be practically independent of the duct flow rate, and the frequency dependence on bubble radius is found to be adequately predicted by a theory advanced by Devin. Data obtained in a similar experiment by one of the authors is included, and the over-all range of bubble radius for the combined experiments is 0.016 in. to 0.075 in., with a mean flow-velocity range of 0.441 ftsec to 2 ftsec. Author
- Fluid Mechanics