A series of numerical investigations was carried out to study the behavior of cavitating turbulent flows in an orifice. In the present work, two different cavitation models were used for the simulation. In the first model, flow was modeled as two interpenetrating fluids (liquid and vapor), and in the second model, the working fluid was assumed to be a mixture of three fluids (liquid, vapor and non-condensable gas). In both cases, we used a finite volume method to discretize the equations and SIMPLEC algorithm to link the pressure and velocity fields. An upwind scheme was used to model convective fluxes and other transport equations. Turbulence effects were considered using the k-ε model. Computations were performed at various inlet pressures and a fixed outlet pressure. The values of discharge coefficient obtained from the simulations were compared with published experimental data. Better agreement was found with the second model. This revealed the importance of non-condensable gases on cavitation. Furthermore, the distributions of vapor volume fraction and velocity magnitude were investigated with using both models. The results showed considerable differences between two models in description of inception of cavitation, distributions of vapor volume fraction and velocity magnitude.
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ASME 2009 Fluids Engineering Division Summer Meeting
August 2–6, 2009
Vail, Colorado, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4372-7
PROCEEDINGS PAPER
Numerical Investigations About the Effect of Non-Condensable Gas on Cavitating Flows
Hamed Sadeghi,
Hamed Sadeghi
University of AmirKabir, Tehran, Iran
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Masoud Darbandi
Masoud Darbandi
University of Sharif, Tehran, Iran
Search for other works by this author on:
Hamed Sadeghi
University of AmirKabir, Tehran, Iran
Masoud Darbandi
University of Sharif, Tehran, Iran
Paper No:
FEDSM2009-78279, pp. 825-832; 8 pages
Published Online:
July 26, 2010
Citation
Sadeghi, H, & Darbandi, M. "Numerical Investigations About the Effect of Non-Condensable Gas on Cavitating Flows." Proceedings of the ASME 2009 Fluids Engineering Division Summer Meeting. Volume 1: Symposia, Parts A, B and C. Vail, Colorado, USA. August 2–6, 2009. pp. 825-832. ASME. https://doi.org/10.1115/FEDSM2009-78279
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