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Experiments in Fluids

, 59:168 | Cite as

Diagnostics of the fluctuating wall shear rate components using an uncalibrated three-segment electrodiffusion sensor

  • M.-É. Lamarche-Gagnon
  • V. Sobolík
  • J. Vétel
Research Article
  • 9 Downloads

Abstract

An inverse problem is used to significantly improve the frequency response of a three-segment electrodiffusion (ED) sensor subjected to strong inertial effects in high-amplitude unsteady flows. It is shown that the fluctuating component of the wall shear rate’s magnitude and direction can be accurately determined when both variables exhibit simultaneous large-amplitude variations, even when using an uncalibrated probe. Measurements are performed in the vicinity of a rotating cylinder in motion in a highly viscous fluid with poor electrochemical diffusivity, thus establishing a harsh environment for an ED sensor. Results using the inverse problem showed strong concordance with PIV complementary measurements in most cases and further expose the potential of this non-intrusive technique for thorough wall shear stress diagnostics.

Graphical Abstract

Notes

Acknowledgements

The authors would like to acknowledge the financial support of the Canadian Foundation for Innovation (CFI), the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Fonds de recherche du Québec—Nature et technologies (FRQNT). We also acknowledge the technical support of T. Lafrance from MËKANIC and J.-M. Béland for their cooperation in the design and fabrication of the experimental setup and the reviewers for valuable recommendations in the revision process.

Supplementary material

348_2018_2623_MOESM1_ESM.avi (7.4 mb)
Supplementary material 1 (avi 7534 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.LADYF, Department of mechanical engineeringPolytechnique MontréalMontrealCanada
  2. 2.LaSIE, Faculty of Science and TechnologyUniversité de La RochelleLa RochelleFrance

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