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Published online by Cambridge University Press:  04 July 2016

Alan Quarmby
Alan Quarmby*
Affiliation:
The University of Manchester Institute of Science and Technology
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Extract

It is quite true that MacMillan gave corrections for both the wall effect and the shear effect. I did not say that MacMillan gave no results for the wall effect but it appears, however, that Patel took notice of a correction which did not include the wall effect.

Thus Patel puts the effective centre of the pitot tube at a distance from the wall y=½Kd and by consideration of a model consisting of a linear sublayer, a transition zone and a fully turbulent region derives a value for K of 1·30 and values for the constants in the logarithmic law profile, A= 5·5 and B=5·45.

Information

Type
Technical Notes
Information
The Aeronautical Journal , Volume 73 , Issue 703 , July 1969 , pp. 603 - 604
Copyright
Copyright © Royal Aeronautical Society 1969 

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References

1. Macmillan, F. A. Experiments on Pitot Tubes in Shear Flow. ARC R & M No 3028, 1957.Google Scholar
2. Patel, V. C. Calibration of the Preston Tube and Limitations in its Use in Pressure Gradients. Jnl Fluid Mech, Vol 23, pl 85, 1965.Google Scholar
3. Sarnecki, A. J. The Turbulent Boundary Layer on a Permeable Surface. PhD Thesis, Cambridge University.Google Scholar
4. Narasimha, R. Applied Mechanics Reviews, No 1938, Vol 20, No 3, 1967.Google Scholar
5. Lyall, H. G. Comment on “On the Use of Preston Tubes in Concentric Annuli”. Journal of the Royal Aeronautical Society, Vol 71, p 865, 1967.Google Scholar
6. Quarmby, A. On the Use of Preston Tubes in Concentric Annuli. Journal of the Royal Aeronautical Society, Vol 71, p 47, January 1967.Google Scholar
7. Quarmby, A. An Experimental Study of Turbulent Flow Through Concentric Annuli. Int J Mech Sci, Vol 9, p 205, 1967.Google Scholar