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Pflieger, Rachel; Bertolo, Julia; Gravier, Léa; Nikitenko, Sergey I.; Ashokkumar, Muthupandian
Ultrasonics sonochemistry, 05/2021, Volume: 73Journal Article
•An experimental method for determination of bubble sizes is thoroughly studied.•If conditions are not optimized, bubble coalescence leads to too big sizes.•The presence of a standing wave enhances coalescence.•Conditions for measurement of the ambient size of cavitation bubbles are determined.•An ambient radius of 2.9–3.0 µm is derived for Ar-saturated water at 362 kHz. A powerful experimental approach to measure the size distribution of bubbles active in sonoluminescence and/or sonochemistry is a technique based on pulsed ultrasound and sonoluminescence emission. While it is an accepted technique, it is still lacking an understanding of the effect of various experimental parameters, including the duration of the pulse on-time, the nature of the dissolved gas, the presence of a gas flow rate, etc. The present work, focusing on Ar-saturated water sonicated at 362 kHz, shows that increasing the pulse on-time leads to the measurement of coalesced bubbles. Reducing the on-time to a minimum and/or adding sodium dodecyl sulfate to water allows to reducing coalescence so that natural active cavitation bubble sizes can be measured. A radius of 2.9–3.0 µm is obtained in Ar-saturated water at 362 kHz. The effects of acoustic power and possible formation of a standing-wave on coalescence and measured bubble sizes are discussed.
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