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Dynamics of a single gas bubble under forced acoustic oscillations of very low frequency

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Original languageEnglish
StatePublished - Nov 2018
Event71st Annual Meeting of the APS Division of Fluid Dynamics - Atlanta, United States
Duration: 18 Nov 201820 Nov 2018
http://meetings.aps.org/Meeting/DFD18/Content/3571

Conference

Conference71st Annual Meeting of the APS Division of Fluid Dynamics
Abbreviated title71st APS DFD
CountryUnited States
CityAtlanta
Period18/11/1820/11/18
Internet address

Abstract

Although the violent collapse of bubbles due to sufficiently strong variations of the ambient pressure in the surrounding liquid has been first theorized and described in 1917 by Lord Rayleigh, there is a lack of studies concerning this phenomenon when caused by acoustic fields of very low frequencies (<20 kHz). A very fundamental way to explore this topic is to study the dynamics of a single bubble surrounded by a liquid of infinite extent. Here, the single bubble dynamics are theoretically evaluated by means of several mathematical models of increasing complexity, from classical Rayleigh-Plesset-like equations to fully compressible flow models. It is revealed that, as the frequency is decreased, the assumption of incompressible flow for the liquid is increasingly less valid as very high Mach numbers are reached at sensibly lower acoustic pressures. However, the collapse presents the same features as the corresponding ultrasonic one, thus opening the possibility to engineering applications. A bespoke experimental set-up for the exploitation of the bubble dynamics at audible sound frequencies is presented. *This project is co-funded by ThermaSMART under the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 778104

Event

71st Annual Meeting of the APS Division of Fluid Dynamics

18/11/1820/11/18

Atlanta, United States

Event: Conference

ID: 88085141