Experiments in Fluids

, Volume 35, Issue 5, pp 389–396

Evaluation of three techniques for wall-shear measurements in three-dimensional flows

  • J. D. Ruedi
  • H. Nagib
  • J. Österlund
  • P. A. Monkewitz
Original Paper

DOI: 10.1007/s00348-003-0650-9

Cite this article as:
Ruedi, J.D., Nagib, H., Österlund, J. et al. Exp Fluids (2003) 35: 389. doi:10.1007/s00348-003-0650-9
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Abstract

Recent improvements in three techniques for measuring skin friction in two- and three-dimensional turbulent wall-bounded shear flows are presented. The techniques are: oil-film interferometry, hot wires mounted near the wall, and surface hot-film sensors based on MEMS technology. First, we demonstrate that the oil-film interferometry technique can be used to measure the skin-friction magnitude and its direction in two- and three-dimensional wall-bounded shear flows. Second, a simple method is outlined to measure the skin friction with a wall wire located outside of the viscous sublayer. Finally, a systematic study of the parameters influencing wall-friction measurements with MEMS sensors is presented. The results demonstrate that accurate measurements of the mean skin friction with MEMS sensors are possible in two- and three-dimensional wall flows. Measurements by the three techniques are compared to each other and to past measurements in the same facility.

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • J. D. Ruedi
    • 1
    • 4
  • H. Nagib
    • 2
  • J. Österlund
    • 3
  • P. A. Monkewitz
    • 1
  1. 1.Laboratory of Fluid MechanicsEPFLLausanneSwitzerland
  2. 2.IITChicagoUSA
  3. 3.FOI/FFAStockholmSweden
  4. 4.SLFDavos DorfSwitzerland