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High speed visualizations of the cavitating vortices of 2D mixing layer

Aeschlimann, Vincent and Prothin, Sebastien and Barre, Stephane and Djeridi, Henda High speed visualizations of the cavitating vortices of 2D mixing layer. (2012) European Journal of Mechanics - B/Fluids, 31. 171 - 180. ISSN 0997-7546

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Official URL: http://dx.doi.org/10.1016/j.euromechflu.2011.07.004

Abstract

The present study investigates experimentally vortex dynamics of a cavitating two-dimensional mixing layer at a high Reynolds number in order to determine the effect of growth and collapse of cavitation. The dynamics and the topology of the vorticity regions corresponding to the low pressure area where cavitation effects take place are studied from the single phase state to highly cavitating conditions. LDV techniques are used in order to characterize the pattern of the turbulent single phase flow. Highspeed visualizations have been performed using a specific image processing of time series to highlight the behaviour and dynamics of the vapour phase. Visualizations, image processing and statistical analysis enable the estimation of the convective velocity and the shedding frequency of the cavitating Kelvin–Helmholtz vortices. The measured visual vapour thickness grows linearly as the Kelvin–Helmholtz instability develops and its expansion rate stays constant for the range of cavitation levels studied. The vortex pairing phenomenon is also analysed. Results show that the spatial development of the mixing area is slightly affected by the vapour phase allowing a self-similar behaviour of the mean motion.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Electrochimica Acta website: http://www.sciencedirect.com/science/journal/09977546
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Navale (FRANCE)
French research institutions > Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Université de Bretagne Occidentale - UBO (FRANCE)
Other partners > Université Grenoble Alpes - UGA (FRANCE)
Other partners > Université Européenne de Bretagne - UEB (FRANCE)
Laboratory name:
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Deposited By: Sebastien Prothin
Deposited On:08 Nov 2013 11:37

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