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Experiments in Fluids

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01-11-2003 | Original Paper

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

Authors: J. D. Ruedi, H. Nagib, J. Österlund, P. A. Monkewitz

Published in: Experiments in Fluids | Issue 5/2003

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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.

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Title: Evaluation of three techniques for wall-shear measurements in three-dimensional flows
Authors: J. D. Ruedi
H. Nagib
J. Österlund
P. A. Monkewitz
Publication date: 01-11-2003
Publisher: Springer-Verlag
Published in: Experiments in Fluids / Issue 5/2003
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-003-0650-9

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Other articles of this Issue 5/2003

Measurement of the turbulent diffusivity in the near field of variable density jets using conditional velocimetry

Influence of a wavy boundary on turbulence.

Velocity measurements at high temperatures by ultrasound Doppler velocimetry using an acoustic wave guide

Expiration flow in a symmetric bifurcation

Analysis and treatment of errors due to high velocity gradients in particle image velocimetry

Influence of a wavy boundary on turbulence.

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