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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 Ám 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
Author:Russell, PS (Mr Patrick Russell)
Author:Giosio, DR (Dr Dean Giosio)
Author:Venning, JA (Mr James Venning)
Author:Pearce, BW (Dr Bryce Pearce)
Author:Brandner, PA (Associate Professor Paul Brandner)
ID Code:111864
Year Published:2017
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2016-10-12
Last Modified:2017-07-24
Downloads:0

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