Cavitation is a harmful phenomenon for control valves. Starting from noise and vibration, cavitation can bring erosion and pitting of mechanical parts. Experimental costs for cavitation tests are high, not even considering the difficulties to test large-sized valves. For those reasons a CFD analysis could be an attractive solution to predict cavitation. However, a reliable numerical prediction of cavitation inception is hard to achieve and the computational cost of complex multi-phase models, necessary for a correct description of this phenomenon, is often very high. The purpose of this research is to overcome those difficulties by using a single-phase model to predict the onset of cavitation, in terms of the incipient cavitation index introduced in several technical standards. A method, based on the generalized pressure criterion reported in previous works, is applied to particularly complex control devices, namely the Cage Ball control valves, in which perforated plates are inserted to increase the energy dissipation with respect to a traditional Ball valve. Numerical results are compared with our own experimental data of acceleration induced by cavitation vibrations, showing good agreement. The final result is a simple and reliable method, with low computational cost, to evaluate the incipient cavitation index for control valves.
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ASME 2013 Pressure Vessels and Piping Conference
July 14–18, 2013
Paris, France
Conference Sponsors:
- Pressure Vessels and Piping Division
- Nondestructive Evaluation Engineering Division
ISBN:
978-0-7918-5568-3
PROCEEDINGS PAPER
Numerical Method to Provide Cavitation Index for Control Valves
Stefano Malavasi
,
Stefano Malavasi
Politecnico di Milano, Milano, Italy
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Marco M. A. Rossi
,
Marco M. A. Rossi
Politecnico di Milano, Milano, Italy
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Gianandrea V. Messa
,
Gianandrea V. Messa
Politecnico di Milano, Milano, Italy
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Giacomo Ferrarese
Giacomo Ferrarese
Politecnico di Milano, Milano, Italy
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Stefano Malavasi
Politecnico di Milano, Milano, Italy
Marco M. A. Rossi
Politecnico di Milano, Milano, Italy
Gianandrea V. Messa
Politecnico di Milano, Milano, Italy
Giacomo Ferrarese
Politecnico di Milano, Milano, Italy
Paper No:
PVP2013-97150, V004T04A003; 7 pages
Published Online:
January 17, 2014
Citation
Malavasi, S, Rossi, MMA, Messa, GV, & Ferrarese, G. "Numerical Method to Provide Cavitation Index for Control Valves." Proceedings of the ASME 2013 Pressure Vessels and Piping Conference. Volume 4: Fluid-Structure Interaction. Paris, France. July 14–18, 2013. V004T04A003. ASME. https://doi.org/10.1115/PVP2013-97150
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