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On the use of the Preston tube in elliptical ducts

Published online by Cambridge University Press:  04 July 2016

J. Duffy  and
D. Cain
J. Duffy
Affiliation:
Liverpool Polytechnic
D. Cain
Affiliation:
Shell Chemicals UK Ltd
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Extract

The principle of wall similarity expressed by a universal logarithmic inner law relationship is well established for turbulent flow in circular pipes. The validity of Preston's original hypothesis for the measurement of turbulent skin friction depends upon the existence of wall similarity. Although Preston's hypothesis appears to be correct in general it has been found that his calibration for the wall pitot tube was incorrect. Extensive observations by Head and Rechenberg showed some discrepancy. Later work by Patel on the measurement of skin friction in three circular pipes covering a much larger experimental range has led to a modified calibration.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 76 , Issue 738 , June 1972 , pp. 371 - 373
Copyright
Copyright © Royal Aeronautical Society 1972 

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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.Google Scholar
2. Head, M. R. and Rechenberg, I. The Preston tube as a means of measuring skin friction. Journal of Fluid Mechanics, Vol 14, Part 1, 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, Part 1, p. 185. 1965.Google Scholar
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6. Preston, J. H. and Norbury, J. F. The three-quarter radius flowmeter—a reaccessment. Flow Measurement in Closed Conduits, Paper A.5, Vol 1, HMSO, Edinburgh. 1962.Google Scholar