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Fluid Mechanics and Heat Transfer in a Channel with Spherical and Oval Dimples

  • Nikolai Kornev
  • Johann Turnow
  • Egon Hassel
  • Sergei Isaev
  • Frank-Hendrik Wurm
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 110)

Abstract

Vortex mechanism of heat transfer enhancement in a narrow channel with dimples has been investigated numerically using unsteady Reynolds averaged Navier Stokes equations (URANS SST and SAS) and Large Eddy Simulations (LES). The flow separation results in a formation of vortex structures which significantly enhance the heat transfer on dimpled surfaces conducted by a small increase of the pressure loss. The vortex structures and the flow are sufficiently unsteady. The vortex structure inside of the dimple changes steadily its orientation causing the long period oscillations with opposite-of-phase motion. The heat transfer enhancement is caused mostly by the amplification of convection. The effect of the wetted area increase is sufficiently smaller.

Keywords

Heat Transfer Large Eddy Simulation Vortex Structure Heat Transfer Enhancement Asymmetric Vortex 
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.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Nikolai Kornev
    • 1
  • Johann Turnow
    • 1
  • Egon Hassel
    • 1
  • Sergei Isaev
    • 1
  • Frank-Hendrik Wurm
    • 2
  1. 1.Dept. Technical ThermodynamicsUniversity of RostockRostockGermany
  2. 2.WILO SEDortmundGermany

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