Transition of cavitating flow to supercavitation within Venturi nozzle – hysteresis investigation
1 Brno University of Technology, FME, Victor Kaplan Dept. of Fluid Engineering, Brno, Czech Republic
2 Brno University of Technology, FEEC, Dept. of Power Electrical and Electronic Engineering, Brno, Czech Republic
3 The Czech Academy of Sciences, Centre for Cyanobacteria and Their Toxins, Brno, Czech Republic
4 Laval University, Department of Mechanical Engineering, Québec, Canada
* Corresponding author: firstname.lastname@example.org
Published online: 12 May 2017
Cavitation is usually considered as undesirable phenomena. On the other hand, it can be utilized in many applications. One of the technical applications is using cavitation in water treatment, where hydrodynamic cavitation seems to be effective way how to reduce cyanobacteria within large bulks of water. The main scope of this paper is investigation of the cavitation within Venturi nozzle during the transition from fully developed cavitation to supercavitation regime and vice versa. Dynamics of cavitation was investigated using experimental data of pressure pulsations and analysis of high speed videos, where FFT of the pixel intensity and Proper Orthogonal Decomposition (POD) of the records were done to identify dominant frequencies connected with the presence of cavitation. The methodology of the high speed (HS) records semiautomated analysis using the FFT was described. Obtained results were correlated and above that the possible presence of hysteresis was discussed.
© The Authors, published by EDP Sciences, 2017
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