Dual frequency ultrasonic cavitation in various liquids: High-speed imaging and acoustic pressure measurements

Journal article


Justin A. Morton, Mohammad Khavari, Abhinav Priyadarshi, Amanpreet Kaur, Nicole Grobert, Jiawei Mi, Kyriakos Porfyrakis, Paul Prentice, Dmitry G. Eskin and Iakovos Tzanakis 2023. Dual frequency ultrasonic cavitation in various liquids: High-speed imaging and acoustic pressure measurements. Physics of Fluids. 35, pp. 1-13. https://doi.org/10.1063/5.0136469
AuthorsJustin A. Morton, Mohammad Khavari, Abhinav Priyadarshi, Amanpreet Kaur, Nicole Grobert, Jiawei Mi, Kyriakos Porfyrakis, Paul Prentice, Dmitry G. Eskin and Iakovos Tzanakis
Abstract

Ultrasonic cavitation is used in various processes and applications, utilizing powerful shock waves and high-speed liquid jets generated by the collapsing bubbles. Typically, a single frequency source is used to produce the desired effects. However, optimization of the efficiency of
ultrasound reactors is necessary to improve cavitation activity in specific applications such as for the exfoliation of two dimensional materials. This research takes the next step to investigate the effect of a dual frequency transducer system on the bubble dynamics, cavitation zone,
pressure fields, acoustic spectra, and induced shock waves for four liquids with a range of physical properties. Using ultra-high-speed imaging and synchronized acoustic pressure measurements, the effect of ultrasonic dual frequencies on bubble dynamics was investigated. The addition of a high frequency transducer (1174 kHz) showed that the bubble fragments and satellite bubbles induced from a low frequency transducer (24 kHz) were able to extend their lifecycle and increase spatial distribution, thus, extending the boundaries of the cavitation zone. Furthermore, this combination of ultrasonic frequencies generated higher acoustic pressures (up to 180%) and enhanced the characteristic shock wave peak, indicating more bubble collapses and the generation of additional shock waves. The dual frequency system also enlarged the cavitation cloud size under the sonotrode. These observations specifically delineated the enhancement of cavitation activity using a dual frequency system pivotal for optimization of existing cavitation-based processing technologies.

KeywordsUltrasonic cavitation; ultrasound reactors; bubble dynamics
Year2023
JournalPhysics of Fluids
Journal citation35, pp. 1-13
PublisherAmerican Institute of Physics
ISSN1089-7666
Digital Object Identifier (DOI)https://doi.org/10.1063/5.0136469
Web address (URL)https://doi.org/10.1063/5.0136469
Accepted author manuscript
File Access Level
Open
Publisher's version
File Access Level
Open
Output statusPublished
Publication dates30 Jan 2023
Publication process dates
Accepted07 Jan 2023
Deposited10 Feb 2023
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