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Microbubble generation from condensation and turbulent breakup of sheet cavitation
Citation
Russell, PS and Giosio, DR and Venning, JA and Pearce, BW and Brandner, PA, Microbubble generation from condensation and turbulent breakup of sheet cavitation, Proceedings of the 31st Symposium on Naval Hydrodynamics, 11-16 September 2016, Monterey, California, USA, pp. 1-13. ISBN 978-0-692-84661-2 (2017) [Refereed Conference Paper]
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Abstract
The formation, size and concentration of microbubbles
generated in the wake of a cavitating hydrofoil
are investigated experimentally for several
Reynolds and cavitation numbers. The present work
is restricted to bubble generation from stable sheet
cavitation. Interactions between the cavity, the
overlying boundary layer and associated interfacial
effects are investigated qualitatively and quantitatively
using high-resolution and high-speed photography.
The physics of cavity breakup and condensation
and microbubble formation are also investigated
using high-speed photography. Size and concentration
of microbubble populations are measured
in the far wake using diffused laser shadowgraphy.
The optical setup of the shadowgraphy permitted
microbubbles in the size range of 5 to 300 µm to
be resolved. Coherent spatial and temporal features
of the sheet cavitation are shown to be functions
of both Reynolds and cavitation numbers. For
the range of microbubble sizes measured, concentrations
are shown to increase with Reynolds number
and reduce with decreasing cavitation number.
In contrast, void fraction increases with decreasing
cavitation number indicating a greater production of
larger diameter bubbles.
Item Details
| Item Type: | Refereed Conference Paper |
|---|---|
| Keywords: | cavitation, wakes, hydrofoils, shadowgraphy |
| Research Division: | Engineering |
| Research Group: | Maritime Engineering |
| Research Field: | Marine Engineering |
| Objective Division: | Defence |
| Objective Group: | Defence |
| Objective Field: | Emerging Defence Technologies |
| UTAS Author: | Russell, PS (Mr Patrick Russell) |
| UTAS Author: | Giosio, DR (Dr Dean Giosio) |
| UTAS Author: | Venning, JA (Dr James Venning) |
| UTAS Author: | Pearce, BW (Dr Bryce Pearce) |
| UTAS Author: | Brandner, PA (Professor Paul Brandner) |
| ID Code: | 111864 |
| Year Published: | 2017 |
| Deposited By: | NC Maritime Engineering and Hydrodynamics |
| Deposited On: | 2016-10-12 |
| Last Modified: | 2018-04-19 |
| Downloads: | 0 |
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