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Dynamics of cavitation inception in high Reynolds number shear flow

Barbaca, L ORCID: 0000-0002-8421-1109, Venning, JA ORCID: 0000-0002-4097-2168, Russell, PS ORCID: 0000-0001-5320-7222, Russell, ES, Pearce, BW ORCID: 0000-0003-2189-5598 and Brandner, PA ORCID: 0000-0002-6721-878X 2020 , 'Dynamics of cavitation inception in high Reynolds number shear flow', in K-H Kim and M Kashiwagi (eds.), Proceedings of the 33nd Symposium on Naval Hydrodynamics , U.S. Office of Naval Research and Osaka University, Japan, pp. 1-12 .

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Abstract

Cavitation inception in high Reynolds number shearflow is an inherently complex phenomenon due to thestochastic character of both the underlying flow andthe nuclei population naturally occurring in the water.Within the present study, the dynamic behaviour ofcavitation inception in the shear layer formed in thewake of a nominally two-dimensional backward-facingstep is investigated in a water tunnel for step heightbased Reynolds numbers of 0.8 × 106 ≤ Re ≤ 1.4 × 106using high-speed imaging and acoustic measurements.Discrete incipient cavities were observed to form as either‘spherical’ or stretched bubbly structures across a widerange of sizes. The collapse of an incipient cavity resultedin a remnant micro-bubble cloud dispersed into the shearlayer and the recirculation zone in the wake of thestep. These micro-bubbles, generally larger in size thanthose naturally occurring in the water, act as preferentialsites for re-nucleation, triggering almost invariably theformation of developed shear layer cavitation. Due to theeffect of re-nucleation, a hysteresis between the incipientand desinent cavitation number is observed. The effect ofhysteresis is found to increase with a decrease in Re.

Item Type: Conference Publication
Authors/Creators:Barbaca, L and Venning, JA and Russell, PS and Russell, ES and Pearce, BW and Brandner, PA
Keywords: cavitation, shear layer, inception,
Journal or Publication Title: Proceedings of the 33nd Symposium on Naval Hydrodynamics
Publisher: U.S. Office of Naval Research and Osaka University
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