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research-article

Numerical and experimental investigation of the cavitating flow within Venturi tube

[+] Author and Article Information
Jiri Kozak

Kaplan Department of Fluid Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, Brno CZ-61669, Czech Republic
jiri.kozak1@gmail.com

Pavel Rudolf

Associate Professor, Kaplan Department of Fluid Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, Brno CZ-61669, Czech Republic
rudolf@fme.vutbr.cz

Martin Hudec

Researcher, Kaplan Department of Fluid Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, Brno CZ-61669, Czech Republic
hudec@fme.vutbr.cz

David Stefan

Researcher, Kaplan Department of Fluid Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, Brno CZ-61669, Czech Republic
david.steffan@gmail.com

Matej Forman

ESI-group, Technicka 15, Brno CZ-61600, Czech Republic
matej.forman@esi-group.com

1Corresponding author.

ASME doi:10.1115/1.4041729 History: Received February 15, 2018; Revised September 13, 2018

Abstract

Hydrodynamic cavitation represents complex physical phenomenon undesirably affecting operation as well as lifespan of many hydraulic machines from small valves to the large hydro power plants. On the other hand, the same phenomenon and its concomitants such as pressure pulsations can be exploited in many positive ways. One of them which seems to be very promising and perspective is the cavitation utilization for reduction of the microorganisms such as cyanobacteria within large bulks of water. Mutual effect of the swirl induced by the upstream mounted generator and flow constriction in converging-diverging nozzle has been experimentally investigated. The analysis of the hydraulic losses in the wide range of the cavitation regimes has been done as well as the investigation of the pipe-wall acceleration induced by the fluctuations of the cavitating structures. The dynamics of the cavitation was studied using the Proper Orthogonal Decomposition of the captured video records. The main scope of this paper is numerical investigation complementing the experimental results. The multiphase simulations were carried out using the OpenFoam 1606+ and its interPhaseChangeFoam solver. The present study focuses on CFD results of the cavitating velocity field within the nozzle and analysis of the loss coefficient within the nozzle. The results of the numerical analysis were utilized for the further discussion of the experimental results.

Copyright (c) 2018 by ASME
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