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Natural nuclei population dynamics in cavitation tunnels

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Khoo, MT, Venning, JA ORCID: 0000-0002-4097-2168, Pearce, BW ORCID: 0000-0003-2189-5598, Takahashi, K, Mori, T and Brandner, PA ORCID: 0000-0002-6721-878X 2020 , 'Natural nuclei population dynamics in cavitation tunnels' , Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow, vol. 61, no. 34 , pp. 1-22 , doi: 10.1007/s00348-019-2843-x.

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Abstract

Nuclei, or microbubble, populations controlthe inception and dynamics of cavitation. It is therefore important to quantify distributions in cavitationtest facilities to rigorously model nucleation dynamics.Measurements of natural nuclei population dynamicswere made in two test facilities in Australia and Japanvia mechanical activation using a Cavitation Susceptibility Meter (CSM). A range of tunnel operating parameters, including pressure, velocity and dissolved oxygen(DO) content, were investigated. The DO saturationcondition upstream of the test section is found to provide a threshold as to whether the population is affected by DO in the Australian test facility. Historicaltrends in the population are quantified, indicating thatregular monitoring is required. Variation of the population around the Australian cavitation tunnel circuitwas studied by varying the water sampling location.Provided the water remains undersaturated, as definedabove, the natural nuclei population in the test-sectioncan be measured by sampling from the lower-limb resorber. Comparisons are made between test facilities inAustralia, Japan and other countries, as well as environmental waters, using different measurement techniques.Optical and acoustic methods show microbubbles in thesize range of 10 to 100 µm typical of those used toM.T. KhooMaritime DivisionDefence Science and Technology GroupFishermans Bend, Victoria, 3207, AustraliaE-mail: matthew.khoo@dst.defence.gov.auM.T. Khoo · J.A. Venning · B.W. Pearce · P.A. BrandnerCavitation Research LaboratoryUniversity of Tasmania, AustraliaK. Takahashi · T. MoriNaval Systems Research CenterAcquisition, Technology & Logistics Agency, Japanmodel cavitation nucleation. CSM measurements showvarying distributions of nuclei with equivalent bubblediameters in the range of 0.5 to 5 µm but global trendssuggest a universal characteristic.

Item Type: Article
Authors/Creators:Khoo, MT and Venning, JA and Pearce, BW and Takahashi, K and Mori, T and Brandner, PA
Keywords: cavitation Susceptibility meter, nuclei measurement, cavitation, experimental techniques and facilities
Journal or Publication Title: Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow
Publisher: Springer
ISSN: 0723-4864
DOI / ID Number: 10.1007/s00348-019-2843-x
Copyright Information:

© Crown 2020. Copyright 2020, Springer Nature

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