Single Bubble Collapse at Audible Frequencies and High Amplitudes

Davide Masiello; Ignacio Tudela; Rama Govindarajan; Rajaram Nityananda; Prashant Valluri

Abstract / Description of output

While the characteristics of bubbles' radial motion have been widely studied for driving frequencies higher than 20 kHz, lower frequency ranges remain unexplored. In this work, dynamics of an acoustically forced gas/vapor single micro-bubble in water have been studied for driving frequencies below 20 kHz by means of a reduced-order model accounting for all the critical thermo-mechanical contributions. Our investigations in a large parameter space (frequency x amplitude =[1-100 kHz] x [1-7.5 atm]) suggest that at low frequencies and/or high amplitudes, water phase-change and vapor segregation play a key role in slowing down the dynamics, yielding a remarkably different behavior where the first collapse is not necessarily the strongest one (which is the case for higher frequencies). However, at moderate amplitudes (1-1.1 atm), low frequency forcing yields bubble dynamics comparable to the high-frequency/high-amplitude cases.

*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

Original language	English
Publication status	Published - Nov 2019
Event	72nd Annual Meeting of the APS Division of Fluid Dynamics - Washington State Convention Center, Seattle, United States Duration: 23 Nov 2019 → 26 Nov 2019 https://www.apsdfd2019.org/

Conference

Conference	72nd Annual Meeting of the APS Division of Fluid Dynamics
Country/Territory	United States
City	Seattle
Period	23/11/19 → 26/11/19
Internet address	https://www.apsdfd2019.org/

Access to Document

http://meetings.aps.org/Meeting/DFD19/Session/P25.5

Cite this

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title = "Single Bubble Collapse at Audible Frequencies and High Amplitudes",

abstract = "While the characteristics of bubbles' radial motion have been widely studied for driving frequencies higher than 20 kHz, lower frequency ranges remain unexplored. In this work, dynamics of an acoustically forced gas/vapor single micro-bubble in water have been studied for driving frequencies below 20 kHz by means of a reduced-order model accounting for all the critical thermo-mechanical contributions. Our investigations in a large parameter space (frequency x amplitude =[1-100 kHz] x [1-7.5 atm]) suggest that at low frequencies and/or high amplitudes, water phase-change and vapor segregation play a key role in slowing down the dynamics, yielding a remarkably different behavior where the first collapse is not necessarily the strongest one (which is the case for higher frequencies). However, at moderate amplitudes (1-1.1 atm), low frequency forcing yields bubble dynamics comparable to the high-frequency/high-amplitude cases.*This project is co-funded by ThermaSMART under the European Union{\textquoteright}s Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie grant agreement No. 778104",

author = "Davide Masiello and Ignacio Tudela and Rama Govindarajan and Rajaram Nityananda and Prashant Valluri",

year = "2019",

month = nov,

language = "English",

note = "72nd Annual Meeting of the APS Division of Fluid Dynamics ; Conference date: 23-11-2019 Through 26-11-2019",

url = "https://www.apsdfd2019.org/",

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TY - CONF

T1 - Single Bubble Collapse at Audible Frequencies and High Amplitudes

AU - Masiello, Davide

AU - Tudela, Ignacio

AU - Govindarajan, Rama

AU - Nityananda, Rajaram

AU - Valluri, Prashant

PY - 2019/11

Y1 - 2019/11

N2 - While the characteristics of bubbles' radial motion have been widely studied for driving frequencies higher than 20 kHz, lower frequency ranges remain unexplored. In this work, dynamics of an acoustically forced gas/vapor single micro-bubble in water have been studied for driving frequencies below 20 kHz by means of a reduced-order model accounting for all the critical thermo-mechanical contributions. Our investigations in a large parameter space (frequency x amplitude =[1-100 kHz] x [1-7.5 atm]) suggest that at low frequencies and/or high amplitudes, water phase-change and vapor segregation play a key role in slowing down the dynamics, yielding a remarkably different behavior where the first collapse is not necessarily the strongest one (which is the case for higher frequencies). However, at moderate amplitudes (1-1.1 atm), low frequency forcing yields bubble dynamics comparable to the high-frequency/high-amplitude cases.*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

AB - While the characteristics of bubbles' radial motion have been widely studied for driving frequencies higher than 20 kHz, lower frequency ranges remain unexplored. In this work, dynamics of an acoustically forced gas/vapor single micro-bubble in water have been studied for driving frequencies below 20 kHz by means of a reduced-order model accounting for all the critical thermo-mechanical contributions. Our investigations in a large parameter space (frequency x amplitude =[1-100 kHz] x [1-7.5 atm]) suggest that at low frequencies and/or high amplitudes, water phase-change and vapor segregation play a key role in slowing down the dynamics, yielding a remarkably different behavior where the first collapse is not necessarily the strongest one (which is the case for higher frequencies). However, at moderate amplitudes (1-1.1 atm), low frequency forcing yields bubble dynamics comparable to the high-frequency/high-amplitude cases.*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

M3 - Abstract

T2 - 72nd Annual Meeting of the APS Division of Fluid Dynamics

Y2 - 23 November 2019 through 26 November 2019

ER -

Single Bubble Collapse at Audible Frequencies and High Amplitudes

Abstract / Description of output

Conference

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