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Microbubble generation from condensation and turbulent breakup of sheet cavitation

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Russell, PS, Giosio, DR ORCID: 0000-0002-4083-7791, Venning, JA ORCID: 0000-0002-4097-2168, Pearce, BW ORCID: 0000-0003-2189-5598 and Brandner, PA ORCID: 0000-0002-6721-878X 2017 , 'Microbubble generation from condensation and turbulent breakup of sheet cavitation', in K-H Kim and P Moin (eds.), Proceedings of the 31st Symposium on Naval Hydrodynamics , Office of Naval Research Science and Technology, USA, pp. 1-13 .

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Abstract

The formation, size and concentration of microbubblesgenerated in the wake of a cavitating hydrofoilare investigated experimentally for severalReynolds and cavitation numbers. The present workis restricted to bubble generation from stable sheetcavitation. Interactions between the cavity, theoverlying boundary layer and associated interfacialeffects are investigated qualitatively and quantitativelyusing high-resolution and high-speed photography.The physics of cavity breakup and condensationand microbubble formation are also investigatedusing high-speed photography. Size and concentrationof microbubble populations are measuredin the far wake using diffused laser shadowgraphy.The optical setup of the shadowgraphy permittedmicrobubbles in the size range of 5 to 300 µm tobe resolved. Coherent spatial and temporal featuresof the sheet cavitation are shown to be functionsof both Reynolds and cavitation numbers. Forthe range of microbubble sizes measured, concentrationsare shown to increase with Reynolds numberand reduce with decreasing cavitation number.In contrast, void fraction increases with decreasingcavitation number indicating a greater production oflarger diameter bubbles.

Item Type: Conference Publication
Authors/Creators:Russell, PS and Giosio, DR and Venning, JA and Pearce, BW and Brandner, PA
Keywords: cavitation, wakes, hydrofoils, shadowgraphy
Journal or Publication Title: Proceedings of the 31st Symposium on Naval Hydrodynamics
Publisher: Office of Naval Research Science and Technology
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