The paper presented here introduces two novel, infrared based wall shear stress measurement techniques. The first provides wall shear stress visualizations with a high spatial and temporal resolution as well as spatial quantitative information. The other technique enables sensor based measurements of the wall shear stress magnitude and direction. Both techniques are based on the close link between momentum and heat transport in the boundary layer and correlate the surface temperature distribution of a heated surface (first technique) or a heated spot (second technique), which is measured using infrared thermography, with the wall shear stress. For the spatial qualification and quantification, the temporal surface temperature evolution of a heated structure subjected to a flow is linked to the wall shear stress distribution. The second, sensor based technique heats a small spot on an otherwise unheated surface. The temperature distribution, or thermal tuft, around this heated spot is closely related to the local wall shear stress magnitude and direction. Results are presented for both techniques and compared to reference measurements and visualizations respectively. Reference measurements of the wall shear stress were obtained using a skin friction balance, oilflow visualizations were used as a reference visualization technique.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4939-2
PROCEEDINGS PAPER
Infrared Based Wall Shear Stress Measurement Techniques
Ilka Rudolph,
Ilka Rudolph
Technical University Berlin, Berlin, Germany
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Matthias Reyer,
Matthias Reyer
Technical University Berlin, Berlin, Germany
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Wolfgang Nitsche
Wolfgang Nitsche
Technical University Berlin, Berlin, Germany
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Ilka Rudolph
Technical University Berlin, Berlin, Germany
Matthias Reyer
Technical University Berlin, Berlin, Germany
Wolfgang Nitsche
Technical University Berlin, Berlin, Germany
Paper No:
IHTC14-22449, pp. 1-10; 10 pages
Published Online:
March 1, 2011
Citation
Rudolph, I, Reyer, M, & Nitsche, W. "Infrared Based Wall Shear Stress Measurement Techniques." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 4. Washington, DC, USA. August 8–13, 2010. pp. 1-10. ASME. https://doi.org/10.1115/IHTC14-22449
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