https://doi.org/10.1140/epjs/s11734-024-01243-x
Regular Article
Influence of ultrasound on the dynamics of an air bubble near a solid surface
1
Institute of Continuous Media Mechanics UB RAS, 1, Koroleva Street, 614013, Perm, Russia
2
Perm State University, 15 Bukireva str., 614068, Perm, Russia
Received:
17
January
2024
Accepted:
1
July
2024
Published online:
15
July
2024
In many technological processes, wettability plays an important role. There are various methods to control the wettability. The use of ultrasound can be used as one of the methods that allows to change the wetting angle and accordingly affect the wettability of the surface. In this paper, we study the effect of ultrasound on the solid surface–liquid–air bubble system. The solid plates of various degrees of wettability (quartz, acrylic, and Teflon plates) are used as the solid surfaces in experiments. The air bubble has a characteristic size of the order of 
. It is found that in the case of quartz plate, when exposed to ultrasound, the bubble is not fixed on the plate, a thin liquid layer remains between them. Since the acoustic pressure is non-uniform along the plate surface due to the reflection of ultrasonic waves from the container walls and the free surface of the water, being near the surface of the quartz glass plate, the bubble is displaced into an area of lower acoustic pressure and oscillates there. In the case of acrylic and Teflon plates, the bubble is fixed on the solid surface, and its surface oscillates with a frequency equal to the frequency of shape mode 2 eigen oscillations. The dependencies of the contact diameter, contact angle, and height of the bubble on the time of ultrasonic exposure are obtained for solid surfaces of different degrees of wettability. The change in wettability in ultrasound field is recorded for the acrylic and Teflon surfaces such that after 10 s of ultrasonic exposure and switching off the ultrasound, the reduction of the contact angle is detected.
Michael O. Kuchinskiy, Tatyana P. Lyubimova, Konstantin A. Rybkin, Vasiliy A. Galishevskiy and Anastasiia D. Sadovnikova have contributed equally to this work.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
