Journal
ULTRASONICS SONOCHEMISTRY
Volume 55, Issue -, Pages 383-394Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2018.05.003
Keywords
Cavitation seeding; Bubble size distributions; Bubble ambient equilibrium radius measurement; Cavitating jet flow; Acoustically cavitated jet; Bubble populations
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Funding
- Deutsche Forschungsgemeinschaft - Germany [ME 1645/5-1, BR 1864/12-1]
- cavitation research group at the Drittes Physikalisches Institut
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Acoustic cavitation typically forms a variety of bubble structures of generally unknown and broad size distributions. As the bubbles strongly oscillate, their (equilibrium) sizes are not directly observable. Here, a method is presented to experimentally determine the size distribution in bubble populations from high-speed imaging of the bubbles in oscillation. To this end, a spherical bubble model is applied in statistical fashion. This technique is applied to several experimentally realized bubble structures: streamer filaments, clusters, and a peculiar structure we report here on, the acoustically cavitated jet. It is generated by the sonication of a submerged jet to produce abundant cavitation at low flow velocities. Our analysis is complemented by numerical exploration of the hydrodynamic and acoustic properties of the experimental configuration in which the observed bubble structures are formed.
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