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Dynamics of cavitation inception in high Reynolds number shear flow
Citation
Barbaca, L and Venning, JA and Russell, PS and Russell, ES and Pearce, BW and Brandner, PA, Dynamics of cavitation inception in high Reynolds number shear flow, Proceedings of the 33nd Symposium on Naval Hydrodynamics, 18-23 October 2020, Osaka, Japan, pp. 1-12. ISBN 978-4-907621-01-8 (2020) [Refereed Conference Paper]
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Abstract
Cavitation inception in high Reynolds number shear
flow is an inherently complex phenomenon due to the
stochastic character of both the underlying flow and
the nuclei population naturally occurring in the water.
Within the present study, the dynamic behaviour of
cavitation inception in the shear layer formed in the
wake of a nominally two-dimensional backward-facing
step is investigated in a water tunnel for step height
based Reynolds numbers of 0.8 × 106 ≤ Re ≤ 1.4 × 106
using high-speed imaging and acoustic measurements.
Discrete incipient cavities were observed to form as either
‘spherical’ or stretched bubbly structures across a wide
range of sizes. The collapse of an incipient cavity resulted
in a remnant micro-bubble cloud dispersed into the shear
layer and the recirculation zone in the wake of the
step. These micro-bubbles, generally larger in size than
those naturally occurring in the water, act as preferential
sites for re-nucleation, triggering almost invariably the
formation of developed shear layer cavitation. Due to the
effect of re-nucleation, a hysteresis between the incipient
and desinent cavitation number is observed. The effect of
hysteresis is found to increase with a decrease in Re.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | cavitation, shear layer, inception, |
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: | Barbaca, L (Dr Luka Barbaca) |
UTAS Author: | Venning, JA (Dr James Venning) |
UTAS Author: | Russell, PS (Mr Patrick Russell) |
UTAS Author: | Russell, ES (Mrs Elizabeth Russell) |
UTAS Author: | Pearce, BW (Dr Bryce Pearce) |
UTAS Author: | Brandner, PA (Professor Paul Brandner) |
ID Code: | 145820 |
Year Published: | 2020 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2021-08-06 |
Last Modified: | 2021-09-24 |
Downloads: | 0 |
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