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Experiments in Fluids

, 54:1510 | Cite as

Experimental study of a two-phase surface jet

  • Matias Perret
  • Mehdi Esmaeilpour
  • Marcela S. Politano
  • Pablo M. CarricaEmail author
Research Article

Abstract

Results of an experimental study of a two-phase jet are presented, with the jet issued near and below a free surface, parallel to it. The jet under study is isothermal and in fresh water, with air injectors that allow variation of the inlet air volume fraction between 0 and 13 %. Measurements of water velocity have been performed using LDV, and the jet exit conditions measured with PIV. Air volume fraction, bubble velocity and chord length distributions were measured with sapphire optical local phase detection probes. The mean free surface elevation and RMS fluctuations were obtained using local phase detection probes as well. Visualization was performed with laser-induced fluorescence. Measurements reveal that the mean free surface elevation and turbulent fluctuations significantly increase with the injection of air. The water normal Reynolds stresses are damped by the presence of bubbles in the bulk of the liquid, but very close to the free surface the effect is reversed and the normal Reynolds stresses increase slightly for the bubbly flow. The Reynolds shear stresses \(\left\langle {u^{\prime } w^{\prime } } \right\rangle\) decrease when bubbles are injected, indicating turbulence attenuation, and are negative at deeper locations, as turbulent eddies shed downward carry high axial momentum deeper into the flow. Flow visualization reveals that the two-phase jet is lifted with the presence of bubbles and reaches the free surface sooner. Significant bubble coalescence is observed, leading to an increase in mean bubble size as the jet develops. The coalescence near the free surface is particularly strong, due to the time it takes the bubbles to pierce the free surface, resulting in a considerable increase in the local air volume fraction. In addition to first explore a bubbly surface jet, the comprehensive dataset reported herein can be used to validate two-phase flow models and computational tools.

Keywords

Free Surface Axial Velocity Reynolds Stress Free Surface Elevation Bubble Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was sponsored by the National Science Foundation’s Fluid Dynamics Program, award number 0853286, with Dr. Horst Henning Winter as the program manager. The authors would like to thank Dr. E. Martin from The University of Illinois who provided the fluorescent particles.

Supplementary material

Supplementary material 1 (MPG 9242 kb)

References

  1. Akhmetbekov Y, Alekseenko S, Dulin V, Markovich D, Pervunin K (2010) Planar fluorescence for round bubble imaging and its application for the study of an axisymmetric two-phase jet. Exp Fluids 48:615–629CrossRefGoogle Scholar
  2. Anthony DG, Willmarth WW (1992) Turbulence measurements in a round jet beneath a free surface. J Fluid Mech 243:699–720CrossRefGoogle Scholar
  3. Carrica PM, Sanz D, Zanette D, Delgadino G, Di Marco P (1995) A contribution to the uncertainties estimation in local void fraction measurements in gas-liquid flows. In: International symposium on two-phase modeling experiment, Rome, ItalyGoogle Scholar
  4. Cartellier A, Achard JL (1991) Local phase detection probes in fluid/fluid two-phase flows. Rev Sci Instrum 62:279–303CrossRefGoogle Scholar
  5. Hoekstra M (1991) Macro wake features of a range of ships. MARIN Report 410461-1-P, Maritime Research Institute, NetherlandsGoogle Scholar
  6. Hosokawa S, Tomiyama A (2010) Effects of bubbles on turbulent flows in vertical channels. In: 7th International conference on multiphase flow, Tampa, FLGoogle Scholar
  7. ITTC (2008a) Uncertainty analysis particle imaging velocimetry. ITTC Procedure 7.5-01-03-03Google Scholar
  8. ITTC (2008b) Uncertainty analysis: laser Doppler velocimetry calibration. ITTC Procedure 7.5-01-03-02Google Scholar
  9. Johansen JP, Castro AM, Carrica PM (2010) Full-scale two-phase flow measurements on Athena research vessel. Int J Multiphase Flow 36:720–737CrossRefGoogle Scholar
  10. Launder BE, Rodi W (1983) The turbulent wall jet-measurements and modeling. Ann Rev Fluid Mech 15:429–459CrossRefGoogle Scholar
  11. Lee SL, Durst F (1982) On the motion of particles in turbulent duct flow. Int J Multiphase Flow 8:125–146CrossRefGoogle Scholar
  12. Liepmann D (1990) The near-field dynamics and entrainment field of submerged and near surface jets. Ph.D. thesis, University of California, San DiegoGoogle Scholar
  13. Liepmann D, Gharib M (1994) The vorticity and entrainment dynamics of near-surface jets. In: Kood EP, Katz J (eds) Free-surface turbulence, ASME FED-181, p 53Google Scholar
  14. Lima Neto IE, Zhu DZ, Rajaratnam N (2008a) Bubbly jets in stagnant water. Int J Multiphase Flow 34:130–1141CrossRefGoogle Scholar
  15. Lima Neto IE, Zhu DZ, Rajaratnam N (2008b) Horizontal injection of gas–liquid mixtures in a water tank. J Hydraul Eng 134:1722–1731CrossRefGoogle Scholar
  16. Lu J, Fernandez A, Tryggvason G (2005) The effect of bubbles on the wall drag in a turbulent channel flow. Phys Fluids 17:095102CrossRefGoogle Scholar
  17. Madnia CK, Bernal LP (1994) Interaction of turbulent round jet with the free-surface. J Fluid Mech 261:305–332CrossRefGoogle Scholar
  18. Marucci G (1969) A theory of coalescence. Chem Eng Sci 24:975–985CrossRefGoogle Scholar
  19. Mudde RF, Groen JS, Van Den Akker HEA (1998) Application of LDA to bubbly flows. Nucl Eng Des 184:329–338CrossRefGoogle Scholar
  20. Murzyn F, Mouaze D, Chaplin JR (2006) Flow visualization and free surface length scales measurements in a horizontal jet beneath a free surface. Exp Therm Fluid Sci 30:703–710CrossRefGoogle Scholar
  21. Newman BG (1961) The deflexion of plane jet by adjacent boundaries—Coanda effect. In: Lachman GV (ed) Boundary layer and flow control. Pergamon Press, Oxford, pp 232–264Google Scholar
  22. Pedocchi F, Martin JE, Garcia MH (2008) Inexpensive fluorescent particles for large-scale experiments using particle image velocimetry. Exp Fluids 45:183–186CrossRefGoogle Scholar
  23. Politano MS, Carrica PM, Turan C, Weber L (2007) A multidimensional two-phase flow model for the total dissolved gas downstream of spillways. J Hydraul Res 45(2):165–177CrossRefGoogle Scholar
  24. Sun TY, Faeth GM (1986) Structure of turbulent bubbly jets. 1. Methods and centerline properties. Int J Multiphase Flow 12:99–114CrossRefGoogle Scholar
  25. Sunol F, Gonzalez-Cinca R (2010) Rise, bouncing and coalescence of bubbles impacting at a free surface. Colloids Surf A 365:36–42CrossRefGoogle Scholar
  26. Trujillo MF, Hsiao C, Choi J, Paterson EG, Chahine GL, Peltier LJ (2007) Numerical and experimental study of a horizontal jet below a free surface. In: 9th International conference on numerical ship hydrodynamics, Ann Arbor, MIGoogle Scholar
  27. Turan C, Politano M, Carrica PM, Weber L (2007a) A study of the water entrainment on Wanapum Dam. In: 32nd IAHR Congress, Venice, ItalyGoogle Scholar
  28. Turan C, Politano M, Carrica PM, Weber L (2007b) Water entrainment due to spillway surface jets. Int J Comput Fluid Dyn 21:137–153zbMATHCrossRefGoogle Scholar
  29. Voulgaris B, Trowbridge JH (1998) Evaluation of the acoustic Doppler velocimeter (ADV) for turbulence measurements. J Atmos Oceanic Technol 15:272–289CrossRefGoogle Scholar
  30. Walker DT (1997) On the origin of the ‘surface current’ in turbulent free-surface flows. J Fluid Mech 339:275–285MathSciNetzbMATHCrossRefGoogle Scholar
  31. Walker DT, Chen CY (1994) Evaluation of algebraic stress modeling in free-surface jet flows. In: Rood EP, Katz J (ed) Free surface turbulence, ASME FED-181, p 83Google Scholar
  32. Walker DT, Johnston VG (1991) Observations of turbulence near the free surface in the wake of a model ship. In: Sahin I, Tryggvason G (ed) Dynamics of bubbles and vortices near a free surface, ASME AMD-119Google Scholar
  33. Walker DT, Chen CY, Willmarth WW (1995) Turbulence structure in free-surface jet flows. J Fluid Mech 291:223–261CrossRefGoogle Scholar
  34. Wallis GB (1969) One-dimensional two-phase flow. Mc-Graw Hill, New YorkGoogle Scholar
  35. Weitkamp DE, Katz M (1980) A review of dissolved-gas supersaturation literature. Trans Am Fish Soc 109:659–670CrossRefGoogle Scholar
  36. Wygnanski I, Fiedler H (1969) Some measurements in the self-preserving jet. J Fluid Mech 38:577–612CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Matias Perret
    • 1
  • Mehdi Esmaeilpour
    • 1
  • Marcela S. Politano
    • 1
  • Pablo M. Carrica
    • 1
    Email author
  1. 1.IIHR-Hydroscience and EngineeringThe University of IowaIowa CityUSA

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