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Article

Cavitation Bubble Cloud Break-Off Mechanisms at Micro-Channels

1
Advanced Engineering Centre, University of Brighton, Cockcroft Building, Lewes Road, Brighton BN2 4GJ, UK
2
Delphi Technologies, Concord Road, Park Royal, London W3 0SE, UK
3
Mechanical Engineering Department, South Kensington Campus, Imperial College, London SW7 2AZ, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Hua Tan
Fluids 2021, 6(6), 215; https://doi.org/10.3390/fluids6060215
Received: 4 May 2021 / Revised: 26 May 2021 / Accepted: 27 May 2021 / Published: 8 June 2021
(This article belongs to the Special Issue Dynamics of Droplets and Bubbles)
This paper provides new physical insight into the coupling between flow dynamics and cavitation bubble cloud behaviour at conditions relevant to both cavitation inception and the more complex phenomenon of flow “choking” using a multiphase compressible framework. Understanding the cavitation bubble cloud process and the parameters that determine its break-off frequency is important for control of phenomena such as structure vibration and erosion. Initially, the role of the pressure waves in the flow development is investigated. We highlight the differences between “physical” and “artificial” numerical waves by comparing cases with different boundary and differencing schemes. We analyse in detail the prediction of the coupling of flow and cavitation dynamics in a micro-channel 20 μm high containing Diesel at pressure differences 7 MPa and 8.5 MPa, corresponding to cavitation inception and "choking" conditions respectively. The results have a very good agreement with experimental data and demonstrate that pressure wave dynamics, rather than the “re-entrant jet dynamics” suggested by previous studies, determine the characteristics of the bubble cloud dynamics under “choking” conditions. View Full-Text
Keywords: cavitation; cloud break-off; turbulence; OpenFOAM cavitation; cloud break-off; turbulence; OpenFOAM
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MDPI and ACS Style

McGinn, P.; Pearce, D.; Hardalupas, Y.; Taylor, A.; Vogiatzaki, K. Cavitation Bubble Cloud Break-Off Mechanisms at Micro-Channels. Fluids 2021, 6, 215. https://doi.org/10.3390/fluids6060215

AMA Style

McGinn P, Pearce D, Hardalupas Y, Taylor A, Vogiatzaki K. Cavitation Bubble Cloud Break-Off Mechanisms at Micro-Channels. Fluids. 2021; 6(6):215. https://doi.org/10.3390/fluids6060215

Chicago/Turabian Style

McGinn, Paul, Daniel Pearce, Yannis Hardalupas, Alex Taylor, and Konstantina Vogiatzaki. 2021. "Cavitation Bubble Cloud Break-Off Mechanisms at Micro-Channels" Fluids 6, no. 6: 215. https://doi.org/10.3390/fluids6060215

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