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Investigation of cavitation and vapor shedding mechanisms in a Venturi nozzle

Brunhart, M., Soteriou, C., Gavaises, M. ORCID: 0000-0003-0874-8534, Karathanassis, I. K. ORCID: 0000-0001-9025-2866, Koukouvinis, F. ORCID: 0000-0002-3945-3707, Jahangir, S. and Poelma, C. (2020). Investigation of cavitation and vapor shedding mechanisms in a Venturi nozzle. Physics of Fluids,

Abstract

Cavitating flow dynamics are investigated in an axisymmetric converging-diverging Venturi nozzle. Computational Fluid Dynamics (CFD) results are compared with those from previous experiments. New analysis performed on the quantitative results from both data sets reveals a coherent trend and show that the simulations and experiments agree well. The CFD results have confirmed the interpretation of the high-speed images of the Venturi flow, which indicated there are two vapor shedding mechanisms that exist under different running conditions: re-entrant jet and condensation shock. Moreover, they provide further detail of the flow mechanisms that cannot be extracted from the experiments. For the first time with this cavitating Venturi nozzle, the re-entrant jet shedding mechanism is reliably achieved in CFD simulations. The condensation shock shedding mechanism is also confirmed, and details of the process are presented. These CFD results compare well with the experimental shadowgraphs, space-time plots and time-averaged reconstructe computed tomography (CT) slices of vapor fraction.

Publication Type: Article
Additional Information: The following article has been accepted by Physics of Fluids. After it is published, it will be found at http://pof.aip.org/.
Subjects: Q Science > QC Physics
T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date Deposited: 20 Jul 2020 11:39
URI: https://openaccess.city.ac.uk/id/eprint/24573
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Official URL: http://pof.aip.org/

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