Enhancement and quenching of high-intensity focused ultrasound cavitation activity via short frequency sweep gaps |
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| Affiliation: | 1. Institut UTINAM – UMR UFC CNRS 6213, Sonochemistry and Surfaces Reactivity, Université de Franche-Comté, Besançon 25000, France;2. Chemical and Biomolecular Engineering, The University of Melbourne, VIC 3010, Australia;3. School of Chemistry, The University of Melbourne, VIC 3010, Australia;1. Manufacturing and Industrial Processes Research Division, Faculty of Engineering, University of Nottingham Malaysia Campus, 43500 Semenyih, Selangor, Malaysia;2. Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom;3. Department of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia;1. Department of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Republic of Korea;2. Soil Environment Center, Korea Environmental Industry & Technology Institute, Seoul 03367, Republic of Korea;3. Department of Environmental Engineering, Kumoh National Institute of Technology, Gumi 39177, Republic of Korea;1. Manufacturing and Industrial Processes Research Division, Faculty of Engineering, University of Nottingham Malaysia Campus, 43500 Semenyih, Selangor, Malaysia;2. Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham Malaysia Campus, 43500 Semenyih, Selangor, Malaysia |
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| Abstract: | This letter reports on the use of frequency sweeps to probe acoustic cavitation activity generated by high-intensity focused ultrasound (HIFU). Unprecedented enhancement and quenching of HIFU cavitation activity were observed when short frequency sweep gaps were applied in negative and positive directions, respectively. It was revealed that irrespective of the frequency gap, it is the direction and frequency sweep rate that govern the cavitation activity. These effects are related to the response of bubbles generated by the starting frequency to the direction of the frequency sweep, and the influence of the sweep rate on growth and coalescence of bubbles, which in turn affects the active bubble population. These findings are relevant for the use of HIFU in chemical and therapeutic applications, where greater control of cavitation bubble population is critical. |
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| Keywords: | HIFU Cavitation Sonochemistry Frequency sweep gaps Sonochemiluminescence |
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