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Measurement of nuclei seeding in hydrodynamic test facilities

Citation

Russell, PS and Barbaca, L and Venning, JA and Pearce, BW and Brandner, PA, Measurement of nuclei seeding in hydrodynamic test facilities, Experiments in Fluids, 61, (79) pp. 1-18. ISSN 0723-4864 (2020) [Refereed Article]

Copyright Statement

Springer-Verlag GmbH Germany, part of Springer Nature 2020

DOI: doi:10.1007/s00348-020-2911-2

Abstract

Microbubble populations within the test section of a variable-pressure water tunnel have been characterised for various operating conditions. The tunnel was operated with demineralised water and artifcially seeded with microbubbles from an array of generators located in a plenum upstream of the tunnel contraction. The generators produce a polydisperse population of microbubbles 10200 μm in the diameter. The microbubbles are generated from supersaturated feed water within a confned turbulent cavitating microjet. The generator and tunnel operating parameters were systematically varied to map the range of nuclei concentrations and size ranges possible in the test section. Microbubbles were measured with Mie Scattering Imaging (MSI), an interferometric sizing technique. A new method was introduced to calibrate the detection volume and extend the dynamic range of the MSI. The acquisition and processing of microbubble measurements with MSI have a fast turn-around such that nuclei concentration measurements are approaching real time. Estimation of the total bubble concentration was within 5% of the sampled concentration after only 100 detections but 104 were necessary for full histogram convergence. The tunnel is operated with water at low dissolved gas content to ensure all injected microbubbles dissolve and do not complete the tunnel circuit. As a result of this, the injected population is altered by dissolution as well as pressure change during the short residence between plenum and test section. The transformation is shown to be complex, changing with tunnel operating conditions. The measured test section nuclei populations were found to follow a power law for the higher concentrations. Test section nuclei concentrations of 024 mL−1 can be achieved through variation of generator and tunnel operating parameters.

Item Details

Item Type:Refereed Article
Keywords:cavitation nuclei, hydrodynamic facilities, laser based imaging, bubble size measurement
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Defence
Objective Group:Defence
Objective Field:Maritime
UTAS Author:Russell, PS (Mr Patrick Russell)
UTAS Author:Barbaca, L (Dr Luka Barbaca)
UTAS Author:Venning, JA (Dr James Venning)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
UTAS Author:Brandner, PA (Professor Paul Brandner)
ID Code:137805
Year Published:2020
Web of Science® Times Cited:2
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2020-03-04
Last Modified:2020-07-30
Downloads:0

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