Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-28T05:49:27.096Z Has data issue: false hasContentIssue false
  • English
  • Français

Simplification of the Razor Blade Technique and its Application to the Measurement of Wall-Shear Stress in Wall-Jet Flows

Published online by Cambridge University Press:  07 June 2016

B. R. Pai  and
J. H. Whitelaw
B. R. Pai
Affiliation:
Imperial College, London
J. H. Whitelaw
Affiliation:
Imperial College, London
Get access

Summary

Experiments in a in (6-35 mm) channel have yielded further information on the precision and convenience of the razor blade technique. It is shown that adhesive tape or carefully located cement can be used to secure a segment of razor blade over a static pressure hole: the resulting calibration for shear stress remains valid if the blade is removed and relocated over the same or a different, similar sized hole. Razor blade segments, calibrated in this manner, have been used to measure wall-shear stress in a turbulent boundary layer with tangential, secondary injection: the results indicate that V. C. Patel’s law of the wall is valid for such flows.

Type
Research Article
Information
Aeronautical Quarterly , Volume 20 , Issue 4 , November 1969 , pp. 355 - 364
Copyright
Copyright © Royal Aeronautical Society. 1964

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Bradshaw, P. and Gee, M. T. Turbulent wall jets with and without an external stream. ARC R & M 3254, 1962.Google Scholar
2. Whitelaw, J. H. An experimental investigation of the two-dimensional wall jet. ARC Current Paper 942, 1967.Google Scholar
3. Kacker, S. C. and Whitelaw, J. H. Some properties of the two-dimensional, turbulent wall-jet in a moving stream. American Society of Mechanical Engineers, Journal of Applied Mechanics, Vol 35E, p. 641, 1968.Google Scholar
4. East, L. F. Measurement of skin friction at low subsonic speeds by the razor blade technique. ARC R & M 3525, 1967.Google Scholar
5. Hool, J. N. Measurement of skin friction using surface tubes. Aircraft Engineering, Vol 28, p. 52, 1956.CrossRefGoogle Scholar
6. Shaw, R. The influence of hole dimensions on static pressure measurements. Journal of Fluid Mechanics, Vol 7, p. 550, 1960.Google Scholar
7. Preston, J. H. The determination of turbulent skin friction by means of pitot tubes. Journal of the Royal Aeronautical Society, Vol 58, p. 109, 1954.Google Scholar
8. Pai, B. R. and Whitelaw, J. H. The influence of density gradients on the effectiveness of film coling. ARC Current Paper 1013, 1968.Google Scholar
9. Clauser, F. H. Turbulent boundary layers in adverse pressure gradients. Journal of the Aeronautical Sciences, Vol 21, p. 91, 1954.CrossRefGoogle Scholar
10. Patel, V. C. Calibration of the Preston tube and limitations on its use in pressure gradients. Journal of Fluid Mechanics, Vol 23, p. 185, 1965.Google Scholar
11. Patankar, S. V. Wall-shear-stress and heat-flux laws for turbulent boundary layers with a pressure gradient; use of van Driest’s eddy viscosity hypothesis. Imperial College, Department of Mechanical Engineering Report TWF/TN/14.Google Scholar
12. Spalding, D. B. and Patankar, S. V. Heat and mass transfer in boundary layers. Morgan-Grampian Press, 1967.Google Scholar
13. Mathieu, J. Contribution a l’étude aérothermique d’un jet plan évaluant en présence d’une paroi. Publications Scientifiques et Techniques du Ministère de l’Air, no. 374, 1961.Google Scholar
14. Patel, R. P. Self-preserving two-dimensional turbulent jets and wall jets in a moving stream. Master’s Thesis, McGill University. 1962.Google Scholar
15. Kruka, V. and Eskinazi, S. The wall-jet in a moving stream. Journal of Fluid Mechanics, Vol 20, p. 555, 1964.Google Scholar