Advertisement

Thermophysics and Aeromechanics

, Volume 23, Issue 5, pp 693–699 | Cite as

Simulation of turbulent non-isothermal polydisperse bubbly flow behind a sudden tube expansion

  • M. A. PakhomovEmail author
  • V. I. Terekhov
Article
  • 30 Downloads

Abstract

The results of numerical simulation of the structure of non-isothermal polydisperse bubbly turbulent flow and heat transfer behind a sudden tube expansion are presented. The study was carried out at a change in the initial diameter of the air bubbles within d m1 = 1–5 mm and their volumetric void fraction β = 0–10 %. Small bubbles are available in almost the entire cross section of the tube, while the large bubbles pass mainly through the flow core. An increase in the size of dispersed phase causes the growth of turbulence in the liquid phase due to flow turbulization, when there is a separated flow of liquid past the large bubbles. Adding the air bubbles causes a significant reduction in the length of the separation zone and heat transfer enhancement, and these effects increase with increasing bubble size and their gas volumetric flow rate ratio.

Key words

bubble separated flow turbulence heat transfer enhancement simulation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    R.L. Simpson, Aspects of turbulent boundary-layer separation, Progress Aerospace Sci., 1996, Vol. 32, P. 457–521.ADSCrossRefGoogle Scholar
  2. 2.
    A.F. Polyakov and P.L. Komarov, Investigation of characteristics of turbulence and heat transfer behind a backfacing step in a slot channel, JIHT RAS, Moscow, 1996, Preprint, No. 2–396.Google Scholar
  3. 3.
    M. Lopez de Bertodano, S.J. Lee, R.T. Lahey, Jr., and D.A. Drew, The prediction of two-phase turbulence and phase distribution using a Reynolds stress model, ASME J. Fluids Engng, 1990, Vol. 112, P. 107–113.CrossRefGoogle Scholar
  4. 4.
    F. Lehr and D. Mewes, A transport equation for the interfacial area density applied to bubble columns, Chem. Engng Sci., 2001, Vol. 56, P. 1159–1166.CrossRefGoogle Scholar
  5. 5.
    L.I. Zaichik, A.P. Skibin, and S.L. Solov’ev, Simulation of the distribution of bubbles in a turbulent liquid using a diffusion-inertia model, High Temperature, 2004, Vol. 42, No. 1, P. 111–117.CrossRefGoogle Scholar
  6. 6.
    E. Krepper, D. Lucas, T. Frank, H.-M. Prasser, and P.J. Zwart, The inhomogeneous MUSIG model for the simulation of polydispersed flows, Nucl. Engng Des., 2008, Vol. 238, P. 1690–1702.CrossRefGoogle Scholar
  7. 7.
    V.T. Nguyen, C.-H. Song, B.U. Bae, and D.J. Euh, Modeling of bubble coalescence and break-up considering turbulent suppression phenomena in bubbly two-phase flow, Int. J. Multiphase Flow, 2013, Vol. 54, P. 31–42.CrossRefGoogle Scholar
  8. 8.
    R.V. Mukin, Modeling of bubble coalescence and break-up in turbulent bubbly flow, Int. J. Multiphase Flow, 2014, Vol. 62, P. 52–66.MathSciNetCrossRefGoogle Scholar
  9. 9.
    V.A. Arkhipov, I.M. Vasenin, A.S. Tkachenko, and A.S. Usanina, Unsteady rise of a bubble in a viscous fluid at small Reynolds numbers, Fluid Dynamics, 2015, Vol. 50, No. 1, P. 79–86.CrossRefzbMATHGoogle Scholar
  10. 10.
    A.A. Gubaidullin and A.S. Gubkin, Peculiarities of the dynamic behavior of bubbles in a cluster caused by their hydrodynamic interaction, Thermophysics and Aeromechanics, 2015, Vol. 22, No. 4, P. 453–462.ADSCrossRefGoogle Scholar
  11. 11.
    G.H. Yeoh and J.Y. Tu Thermal-hydrodynamic modelling for bubbly flows with heat and mass transfer, AIChE J., 2005, Vol. 51, P. 8–29.CrossRefGoogle Scholar
  12. 12.
    M.A. Pakhomov and V.I. Terekhov, Numerical simulation of the flow and heat transfer in a downward turbulent gas-liquid flow in a pipe, High Temperature, 2011, Vol. 49, No. 5, P. 712.CrossRefGoogle Scholar
  13. 13.
    O.N. Kashinsky, V.V. Randin, and A.V. Chinnak, The effect of channel orientation on heat transfer and shear stress in the bubbly flow, Thermophysics and Aeromechanics, 2013, Vol. 20, No. 4, P. 391–398.ADSCrossRefGoogle Scholar
  14. 14.
    M.A. Pakhomov and V.I. Terekhov, Simulation of the turbulent structure of a flow and heat transfer in an ascending polydisperse bubble flow, Technical Physics, 2015, Vol. 85, Iss. 9, P. 1268–1276.ADSCrossRefGoogle Scholar
  15. 15.
    W.H. Ahmed, C.Y. Ching, and M. Shoukri, Development of two-phase flow downstream of a horizontal sudden expansion, Int. J. Heat Fluid Flow, 2008, Vol. 29, P. 194–206.CrossRefGoogle Scholar
  16. 16.
    A. Voutsinas, T. Shakouchi, K. Tsujimoto, and T. Ando, Investigation of bubble size effect on vertical upward bubbly two-phase pipe flow consisted with an abrupt expansion, J. Fluid Sci. Techn., 2009, Vol. 4, P. 442–452.ADSCrossRefGoogle Scholar
  17. 17.
    A. Fadai-Ghotbi, R. Manceau, and J. Boree, Revisiting URANS computations of the backward-facing step flow using second moment closures. Influence of the numerics, Flow, Turb. Combust., 2008, Vol. 81, P. 395–410.CrossRefzbMATHGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  1. 1.Kutateladze Institute of Thermophysics SB RASNovosibirskRussia

Personalised recommendations