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Simplified Presentation of Preston Tube Calibration

Published online by Cambridge University Press:  07 June 2016

M. R. Head  and
V. Vasanta Ram
M. R. Head
Affiliation:
Indian Institute of Technology, Kanpur
V. Vasanta Ram
Affiliation:
Indian Institute of Technology, Kanpur
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Summary

Two alternative presentations are given of Patel’s Preston tube calibration. In the first, Δp/τw is tabulated as a function of Δpd2/ρν2; in the second, cf is plotted as a function of Δp/½ρU2 and Ud/ν, so that values of cf, can be read off directly.

Type
Research Article
Information
Aeronautical Quarterly , Volume 22 , Issue 3 , August 1971 , pp. 295 - 300
Copyright
Copyright © Royal Aeronautical Society. 1971

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References

1. 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.CrossRefGoogle Scholar
2. Head, M. R. and Rechenberg, I. The Preston tube as a means of measuring skin friction. Journal of Fluid Mechanics, Vol. 14, p. 1, 1962.Google Scholar
3. 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
4. Rechenberg, I. Messung der turbulenten Wandschubspannung. Archiv für Flugwissenschaften, Vol. 11, p. 429, 1963.Google Scholar
5. Patel, V. C. and Head, M. R. Some observations of skin friction and velocity profiles in fully developed pipe and channel flows. Journal of Fluid Mechanics, Vol. 38, p. 181, 1969.Google Scholar