Natural nuclei population dynamics in cavitation tunnels
Khoo, MT and Venning, JA and Pearce, BW and Takahashi, K and Mori, T and Brandner, PA, Natural nuclei population dynamics in cavitation tunnels, Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow, 61, (34) pp. 1-22. ISSN 0723-4864 (2020) [Refereed Article]
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
Defence Science and Technology Group
Fishermans Bend, Victoria, 3207, Australia
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.
cavitation Susceptibility meter, nuclei measurement, cavitation, experimental techniques and facilities