A THERMODYNAMIC CAVITATION MODEL APPLICABLE TO HIGH TEMPERATURE FLOW

Abstract

Cavitation is not only related with pressure, but also affected by temperature. Under high temperature, temperature depression of liquids is caused by latent heat of vaporization. The cavitation characteristics under such condition are different from those under room temperature. The paper focuses on thermodynamic cavitation based on the Rayleigh-Plesset equation and modifies the mass transfer equation with fully consideration of the thermodynamic effects and physical properties. To validate the modified model, the external and internal flow fields, such as hydrofoil NACA0015 and nozzle, are calculated, respectively. The hydrofoil NACA0015's cavitation characteristic is calculated by the modified model at different temperatures. The pressure coefficient is found in accordance with the experimental data. The nozzle cavitation under the thermodynamic condition is calculated and compared with the experiment.

Keywords

Dates

  • Submission Date2010-06-30
  • Revision Date2010-07-21
  • Acceptance Date2010-11-11

DOI Reference

10.2298/TSCI11S1095L

References

  1. Batchelor, G. K., An Introduction to Fluid Dynamics, Cambridge University Press, Cambridge, United Kingdom,1967
  2. Shah, Y. T., Pandit, A. B., Moholkar, V.S., Cavitation Reaction Engineering, Kluwer Academic/Plenum Publishers, Dordrecht, The Netherlands, 1999
  3. Stahl, H. A., Stepanoff, A. J., Thermodynamic Aspects of Cavitation in Centrifugal Pumps, ASME Journal of Basic Engineering, 78 (1956), 8, pp. 1691-1693
  4. Moore, R. D., Ruggeri, R. S., Prediction of Thermodynamic Effects on Developed Cavitation Based on Liquid-Hydrogen and Freon-114 Data in Scaled Venturis, NASA TN D-4899, 1968
  5. Holl, J. W., Wislicenus, G. F., Scale Effects on Cavitation, ASME Journal of Basic Engineering, 83 (1961), pp. 385-398
  6. Deshpande, M., Feng, J., Merkle, C. L., Numerical Modeling of the Thermodynamic Effects of Cavita-tion, Journal of Fluid Engineering, 119 (1997), 2, pp. 420-427
  7. Singhal, A. K., et al., Mathematical Basis and Validation of the Full Cavitation Model, Journal of Fluids Engineering, 124 (2002), 3, pp. 617-624
  8. Liu, D. M., Liu, S. H., Wu, Y. L., Numerical Analysis of Airfoil NACA0015 Cavitation Characteristic Based on the Thermodynamic Effects, Modern Physics Letters B, 24 (2010), 13 pp. 1499-1502
  9. Abuaf, N., et al., A Study of Nonequilibrium Flashing of Water in a Converging-Diverging Nozzle, NUREG/CR 1864, Vol. 2, Office of Nuclear Regulatory Research, 1981
  10. Palau-Salvador, G., González-Altozano, P., Arviza-Valverde, J., Numerical Modeling of Cavitating Flows for Simple Geometries Using FLUENT V6.1, Spanish Journal of Agricultural Research 5 (2007), 4, pp. 460-469
Volume 15, Issue 11, Pages95 -101