Advertisement

Acta Mechanica Sinica

, Volume 34, Issue 5, pp 830–838 | Cite as

Experimental study on flow control of the turbulent boundary layer with micro-bubbles

  • Peng-Long Zhao
  • Yao-Hui Chen
  • Gang Dong
  • Yi-Xin Liu
  • Xu-Jian Lyu
Research Paper
  • 101 Downloads

Abstract

The effect of micro-bubbles on the turbulent boundary layer in the channel flow with Reynolds numbers (Re) ranging from \(0.87\times 10 ^{5}\) to \(1.23\times 10^{5}\) is experimentally studied by using particle image velocimetry (PIV) measurements. The micro-bubbles are produced by water electrolysis. The velocity profiles, Reynolds stress and instantaneous structures of the boundary layer, with and without micro-bubbles, are measured and analyzed. The presence of micro-bubbles changes the streamwise mean velocity of the fluid and increases the wall shear stress. The results show that micro-bubbles have two effects, buoyancy and extrusion, which dominate the flow behavior of the mixed fluid in the turbulent boundary layer. The buoyancy effect leads to upward motion that drives the fluid motion in the same direction and, therefore, enhances the turbulence intense of the boundary layer. While for the extrusion effect, the presence of accumulated micro-bubbles pushes the flow structures in the turbulent boundary layer away from the near-wall region. The interaction between these two effects causes the vorticity structures and turbulence activity to be in the region far away from the wall. The buoyancy effect is dominant when the Re is relatively small, while the extrusion effect plays a more important role when Re rises.

Keywords

PIV Micro-bubbles Turbulent boundary layer Reynolds stress 

Notes

Acknowledgements

The project was supported by the National Natural Science Foundation of China (Grant 51609115) and the Foundation of National Key Laboratory of Transient Physics (Grant 9140C300206150C30143).

References

  1. 1.
    Ge, M.W., Xu, C.X., Cui, G.X.: Active control of turbulence for drag reduction based on the detection of near-wall streamwise vortices by wall information. Acta. Mech. Sin. 31, 512–522 (2015)CrossRefGoogle Scholar
  2. 2.
    Manshadi, M.D., Rabani, R.: Numerical evaluation of passive control of shock wave/boundary layer interaction on NACA0012 airfoil using jagged wall. Acta. Mech. Sin. 32, 792–804 (2016)CrossRefGoogle Scholar
  3. 3.
    Guan, X.L., Yao, S.Y., Jiang, N.: A study on coherent structures and drag-reduction in the wall turbulence with polymer additives by TRPIV. Acta. Mech. Sin. 29, 485–493 (2013)CrossRefGoogle Scholar
  4. 4.
    Kumagai, I., Takahashi, Y., Murai, Y.: Power-saving device for air bubble generation using a hydrofoil to reduce ship drag: theory, experiments, and application to ships. Ocean Eng. 95, 183–194 (2015)CrossRefGoogle Scholar
  5. 5.
    Hashim, A., Yaakob, O.B., Kob, K.K., et al.: Review of micro-bubble ship resistance reduction methods and the mechanisms that affect the skin friction on drag reduction from 1999 to 2015. J. Teknologi. 74, 105–114 (2015)Google Scholar
  6. 6.
    Murai, Y.: Frictional drag reduction by bubble injection. Exp. Fluids 55, 1773 (2014)CrossRefGoogle Scholar
  7. 7.
    Fu, H.P.: Numerical simulation of microbubble drag reduction in a plate and factors in fluencing its practicality process. J. Harbin Eng. Univ. 36, 1297–1301 (2015). (in Chinese)Google Scholar
  8. 8.
    Murai, Y., Fukuda, H., Oishi, Y., et al.: Skin friction reduction by large air bubbles in a horizontal channel flow. Int. J. Multiphase Flow 33, 147–163 (2007)CrossRefGoogle Scholar
  9. 9.
    Tsai, J.F., Chen, C.C.: Boundary layer mixture model for a microbubble drag reduction technique. ISRN Mech. Eng. 2011, 1–9 (2011)CrossRefGoogle Scholar
  10. 10.
    Sayyaadi, H., Nematollahi, M.: Determination of optimum injection flow rate to achieve maximum micro bubble drag reduction in ships; an experimental approach. Sci. Iran. B. 20, 535–541 (2013)Google Scholar
  11. 11.
    Jacob, B., Olivieri, A., Miozzi, M., et al.: Drag reduction by microbubbles in a turbulent boundary layer. Phys. Fluids. 22, 115104 (2010)CrossRefGoogle Scholar
  12. 12.
    Kanai, A., Miyata, H.: Direct numerical simulation of wall turbulent flows with microbubbles. Int. J. Numer. Methods Fluids. 35, 593–615 (2001)CrossRefGoogle Scholar
  13. 13.
    Ferrante, A., Elghobashi, S.: On the physical mechanisms of drag reduction in a spatially developing turbulent boundary layer laden with microbubbles. J. Fluid Mech. 503, 345–355 (2004)CrossRefGoogle Scholar
  14. 14.
    Shen, X.C., Ceccio, S.L., Perlin, M.: Influence of bubble size on micro-bubble drag reduction. Exp. Fluids 41, 415–424 (2006)CrossRefGoogle Scholar
  15. 15.
    Lo, T.S., L’vov, V.S., Procaccia, I.: Drag reduction by compressible bubbles. Phys. Rev. 73, 036308 (2006)Google Scholar
  16. 16.
    Pang, M.J., Wei, J.J., Yu, B.: Investigation on influences of bubble location and momentum transfer direction on liquid turbulence modification for the dilute bubbly flow. Int. J. Fluid Mech. Res. 43, 161–181 (2016)CrossRefGoogle Scholar
  17. 17.
    Kim, J., Moin, P., Moser, R.: Turbulence statistics in fully developed channel flow at low Reynolds number. J. Fluid Mech. 177, 133–166 (1987)CrossRefGoogle Scholar
  18. 18.
    Moser, R.D., Kim, J., Mansour, N.N.: Direct numerical simulation of turbulent channel flow up to Re\(_{\tau }\)=590. Phys. Fluids 11, 943–945 (1999)CrossRefGoogle Scholar
  19. 19.
    Pang, M.J., Wei, J.J.: Experimental investigation on the turbulence channel flow laden with small bubbles by PIV. Chem. Eng. Sci. 94, 302–315 (2013)CrossRefGoogle Scholar
  20. 20.
    Adrian, R.J., Meinhart, C.D., Tomkins, C.D.: Vortex organization in the outer region of the turbulent boundary layer. J. Fluid Mech. 422, 1–54 (2000)MathSciNetCrossRefGoogle Scholar
  21. 21.
    Li, J., Dong, G., Lu, Z.H.: Formation and evolution of a hairpin vortex induced by subharmonic sinuous low-speed streaks. Fluid Dyn. Res. 46, 055516 (2014)MathSciNetCrossRefGoogle Scholar

Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Peng-Long Zhao
    • 1
  • Yao-Hui Chen
    • 1
  • Gang Dong
    • 1
  • Yi-Xin Liu
    • 1
  • Xu-Jian Lyu
    • 2
  1. 1.Key Laboratory of Transient PhysicsNanjing University of Science and TechnologyNanjingChina
  2. 2.School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjingChina

Personalised recommendations