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Nuclei, or microbubble, populations control the inception and dynamics of cavitation. It is therefore important to quantify distributions in cavitation test facilities to rigorously model nucleation dynamics. Measurements of natural nuclei population dynamics were made in two test facilities in Australia and Japan via 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 saturation condition 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. Historical trends in the population are quantified, indicating that regular monitoring is required. Variation of the population around the Australian cavitation tunnel circuit was studied by varying the water sampling location. Provided the water remains undersaturated, as defined above, the natural nuclei population in the test-section can be measured by sampling from the lower-limb resorber. Comparisons are made between test facilities in Australia, Japan and other countries, as well as environmental waters, using different measurement techniques. Optical and acoustic methods show microbubbles in the size range of 10 to 100 µm typical of those used to M.T. Khoo Maritime Division Defence Science and Technology Group Fishermans Bend, Victoria, 3207, Australia E-mail: matthew.khoo@dst.defence.gov.au M.T. Khoo · J.A. Venning · B.W. Pearce · P.A. Brandner Cavitation Research Laboratory University of Tasmania, Australia K. Takahashi · T. Mori Naval Systems Research Center Acquisition, Technology & Logistics Agency, Japan model cavitation nucleation. CSM measurements show varying distributions of nuclei with equivalent bubble diameters in the range of 0.5 to 5 µm but global trends suggest a universal characteristic.

Item Type:	Refereed Article
Keywords:	cavitation Susceptibility meter, nuclei measurement, cavitation, experimental techniques and facilities
Research Division:	Engineering
Research Group:	Maritime engineering
Research Field:	Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in engineering
UTAS Author:	Khoo, MT (Mr Matthew Khoo)
UTAS Author:	Venning, JA (Dr James Venning)
UTAS Author:	Pearce, BW (Dr Bryce Pearce)
UTAS Author:	Brandner, PA (Professor Paul Brandner)
ID Code:	138313
Year Published:	2020
Web of Science® Times Cited:	2
Deposited By:	NC Maritime Engineering and Hydrodynamics
Deposited On:	2020-04-01
Last Modified:	2020-06-22
Downloads:	0