Koch, M., Lechner, C., Lauterborn, W., & Mettin, R. (2022). Mushroom shaped bubbles and the jet of 1000 m/s. In J. VAD (Ed.), Proceedings of the Conference on Modelling Fluid Flow (CMFF’22) (pp. 507–514). Department of Fluid Mechanics, Budapest University of Technology and Economics. http://hdl.handle.net/20.500.12708/80633
Proceedings of the Conference on Modelling Fluid Flow (CMFF'22)
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ISBN:
978-963-421-881-4
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Date (published):
16-Sep-2022
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Event name:
Conference on Modelling Fluid Flow (CMFF’22)
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Event date:
30-Aug-2022 - 2-Sep-2022
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Event place:
Budapest, Hungary
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Number of Pages:
8
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Publisher:
Department of Fluid Mechanics, Budapest University of Technology and Economics, Budapest, Hungary
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Peer reviewed:
Yes
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Keywords:
single cavitation bubble
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CFD; high-speed imaging
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Abstract:
The dynamics of a single, laser-induced cavitation bubble on top of a solid cylinder is studied both
experimentally and numerically. When the bubble is
generated close to the flat top along the axis of the
cylinder and its maximum radius exceeds the one of
the flat top surface, it collapses in the form of a mushroom with a footing on the cylinder, a long stem and a
hat-like cap typical for a mushroom head. The head
may collapse forming a thin, fast liquid jet into the
stem, depending on bubble size and bubble distance
to the top of the cylinder. The parameter space of
initial distance to the cylinder, bubble size and cylinder radius is scanned numerically, partly compared
to experiments and evaluated for the resulting jet velocity and jet length and other features. The results
represent a contribution to understand the behavior
of bubbles collapsing close to structured surfaces, in
particular, how thin, fast jets are generated. An indication how the fast jet plays a role for erosion is given,
as well.
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Project title:
Komplexe Dynamik von Kavitationsblasen an Objekten: I5349-N (Fonds zur Förderung der wissenschaftlichen Forschung (FWF))
