Do Flexible Surface-Hairs Manipulate Near-Wall Turbulence?

  • Christoph BrückerEmail author
Part of the Springer Proceedings in Physics book series (SPPHY, volume 141)


Turbulent boundary layer flow over a flat plate with an artificial hairy coating is investigated. Flexible hairs of appropriate dimensions are chosen to achieve strong reconfiguration in streamwise direction with the mean flow such that their long cylindrical trailing bodies are placed in the buffer layer. Elasticity, anisotropic flow-opposing body forces and hydrodynamic interaction of the hairs in combination with the travelling wave-type nature of near-wall turbulence lead in sum to an energy transfer from small scale motion to a more coherent motion pattern near the wall with increased coherence in streamwise and spanwise direction. It is concluded from the experiments that appropriate geometrical arrangements of surface-hairs can be beneficial for reduction of turbulent skin friction.


Turbulent Boundary Layer Drag Reduction Streamwise Direction Spanwise Direction Minimum Response Time 
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  1. 1.
    Bartenwerfer, M., Bechert, D.W.: Viscous flow on hairy surfaces. Zeitschrift fuer Flugwissenschaften und Weltraumforschung 15, 19–26 (1991)Google Scholar
  2. 2.
    Brücker, C., Bauer, D., Chaves, H.: Dynamic response of micro-pillar sensors measuring fluctuating wall-shear stress. Exp. Fluids 42(5), 737–749 (2007)CrossRefGoogle Scholar
  3. 3.
    Brücker, C.: Signature of varicose wave packets in the viscous sublayer. Phys. Fluids 20, 061701 (2008), doiCrossRefGoogle Scholar
  4. 4.
    Brücker, C.: Interaction of near wall turbulence with flexible micro-hairs. J. Phys.: Condens. Matter 22 (2010) (accepted July 2010, printed version to appear December 2010)Google Scholar
  5. 5.
    Favier, J., Dauptain, A., Basso, D., Bottaro, A.: Passive separation control using a self-adaptive hairy coating. J. Fluid Mech. 627, 451–483 (2009)MathSciNetzbMATHCrossRefGoogle Scholar
  6. 6.
    Iwamoto, K., Fukagata, K., Kasagi, N., Suzuki, Y.: Friction drag reduction achievable by near-wall turbulence manipulation at high Reynolds number. Phys. Fluids 17, 011702 (2005)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Institute of Mechanics and Fluid DynamicsTU FreibergFreibergGermany

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