<div class="csl-bib-body">
<div class="csl-entry">Tervo, M., Koch, M., Lechner, C., & Mettin, R. (2024, November 5). <i>Microstreaming induced by acoustically driven oscillating bubbles at a solid boundary</i> [Conference Presentation]. Fünftes Kolloquium Kavitation und Kavitationserosion, Bochum, Germany. http://hdl.handle.net/20.500.12708/208249</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/208249
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dc.description.abstract
Oscillating bubbles create a mean net flow in the surrounding fluid through non-linear effects in the
boundary layer of the bubble, often referred to as microstreaming. The induced mean flow and the
created shear forces in the bulk and at surfaces can be used, for instance, for mixing, transport of
particles, or controlled action on objects or cells. Understanding this process quantitatively might
help in biomedical applications or in sensitive cleaning without damage.
Here, we study the streaming and the shear stress on a nearby solid wall induced by a bubble
oscillating in a moderately strong ultrasonic field of 30 kHz. High-speed recordings are compared to
3D axi-symmetric numerical simulations, based on the Finite-Volume / Volume-of-Fluid method for
two compressible fluids, including surface tension. The experimental results show that complicated
surface mode oscillations occur that finally destroy the bubble into a localized “chaotic” bubble
cluster. Nevertheless, an “ordered” averaged flow field seems to persist far from the cluster,
transporting away split-off microbubbles. Numerical results can reproduce rather well the bubble’s
surface oscillations until the breaking of axi-symmetry. Direction and magnitudes of calculated net
flow velocities are compared to estimates from microbubble trajectories and show reasonable
agreement.
en
dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.language.iso
en
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dc.subject
bubble
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dc.subject
acoustic excitation
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dc.subject
ultra sound
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dc.subject
microstreaming
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dc.subject
numerical simulations
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dc.subject
OpenFOAM
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dc.title
Microstreaming induced by acoustically driven oscillating bubbles at a solid boundary
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dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
University of Göttingen, Germany
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dc.contributor.affiliation
University of Göttingen, Germany
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dc.contributor.affiliation
University of Göttingen, Germany
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dc.relation.grantno
I5349-N
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dc.type.category
Conference Presentation
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tuw.project.title
Komplexe Dynamik von Kavitationsblasen an Objekten
