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An Investigation of Cloud Cavitation about a Sphere


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Brandner, PA, Walker, GJ, Niekamp, PN and Anderson, B 2007 , 'An Investigation of Cloud Cavitation about a Sphere', paper presented at the 16th Australasian Fluid Mechanics Conference, 2-7 December, 2007, Crown Plaza, Gold Coast, Australia.

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Cloud cavitation occurrence about a sphere is investigated in a
variable pressure water tunnel using still and high-speed
photography. The model sphere, 0.15 m in diameter, was sting
mounted within a 0.6 m square test section and tested at a
constant Reynolds number of 1.5 x 106 with cavitation numbers
varying between 0.36 and 1.0. High-speed photographic
recordings were made at 6 kHz for several cavitation numbers.
Shedding phenomena and frequency content is investigated by
means of pixel intensity time series data using wavelet analysis.
The boundary layer at cavity separation is shown to be laminar
for all cavitation numbers, with Kelvin-Helmholtz instability the
main mechanism for cavity break up and cloud formation at high
cavitation numbers. At intermediate cavitation numbers, cavity
lengths allow the development of re-entrant jet phenomena
providing a mechanism for shedding of large scale Karman-type
vortices similar to those for low mode shedding in single-phase
subcritical flow. This shedding mode is eliminated at low
cavitation numbers with the onset of supercavitation.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Brandner, PA and Walker, GJ and Niekamp, PN and Anderson, B
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