Cavitation leads to rapid degassing of fluids. Up to date, there is a lack of model approaches of cavitation-induced degassing. The aim of the present study is to gain a more thorough knowledge of the process. Therefore, the relation between cavitation intensity and air release is investigated experimentally for an orifice flow as function of cavitation number. For this, shadowgraphy imaging is used to visualize regions of steam and air volume downstream of the orifice. Analysis of the images shows a strongly nonlinear scaling behavior for both cavitation intensity and air release as a function of cavitation number. Three distinct regimes could be identified for cavitation-induced gas release. While an exponential scaling was found at high cavitation intensities, degassing rates appear to be nearly constant in the intermediate cavitation number range. Empirical scaling laws are given here that may serve as first model approach for the prediction of cavitation induced air release behind flow constrictions.
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June 2018
Research-Article
Experimental Study on Cavitation-Induced Air Release in Orifice Flows
Karoline Kowalski,
Karoline Kowalski
Chair of Process Technology,
Ruhr University Bochum,
Universitätsstr. 150,
Bochum 44801, Germany
e-mail: kowalski@vtp.ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150,
Bochum 44801, Germany
e-mail: kowalski@vtp.ruhr-uni-bochum.de
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Stefan Pollak,
Stefan Pollak
Chair of Particle Technology,
Ruhr University Bochum,
Bochum 44801, Germany
e-mail: pollak@fvt.ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150
,Bochum 44801, Germany
e-mail: pollak@fvt.ruhr-uni-bochum.de
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Romuald Skoda,
Romuald Skoda
Chair of Hydraulic Fluid Machinery,
Ruhr University Bochum,
Bochum 44801, Germany
e-mail: Romuald.Skoda@ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150
,Bochum 44801, Germany
e-mail: Romuald.Skoda@ruhr-uni-bochum.de
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Jeanette Hussong
Jeanette Hussong
Chair of Hydraulic Fluid Machinery,
Ruhr University Bochum,
Bochum 44801, Germany
e-mail: Jeanette.Hussong@ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150
,Bochum 44801, Germany
e-mail: Jeanette.Hussong@ruhr-uni-bochum.de
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Karoline Kowalski
Chair of Process Technology,
Ruhr University Bochum,
Universitätsstr. 150,
Bochum 44801, Germany
e-mail: kowalski@vtp.ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150,
Bochum 44801, Germany
e-mail: kowalski@vtp.ruhr-uni-bochum.de
Stefan Pollak
Chair of Particle Technology,
Ruhr University Bochum,
Bochum 44801, Germany
e-mail: pollak@fvt.ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150
,Bochum 44801, Germany
e-mail: pollak@fvt.ruhr-uni-bochum.de
Romuald Skoda
Chair of Hydraulic Fluid Machinery,
Ruhr University Bochum,
Bochum 44801, Germany
e-mail: Romuald.Skoda@ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150
,Bochum 44801, Germany
e-mail: Romuald.Skoda@ruhr-uni-bochum.de
Jeanette Hussong
Chair of Hydraulic Fluid Machinery,
Ruhr University Bochum,
Bochum 44801, Germany
e-mail: Jeanette.Hussong@ruhr-uni-bochum.de
Ruhr University Bochum,
Universitätsstr. 150
,Bochum 44801, Germany
e-mail: Jeanette.Hussong@ruhr-uni-bochum.de
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 30, 2017; final manuscript received December 8, 2017; published online January 30, 2018. Assoc. Editor: Hui Hu.
J. Fluids Eng. Jun 2018, 140(6): 061201 (7 pages)
Published Online: January 30, 2018
Article history
Received:
August 30, 2017
Revised:
December 8, 2017
Citation
Kowalski, K., Pollak, S., Skoda, R., and Hussong, J. (January 30, 2018). "Experimental Study on Cavitation-Induced Air Release in Orifice Flows." ASME. J. Fluids Eng. June 2018; 140(6): 061201. https://doi.org/10.1115/1.4038730
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