McKeon, B. J. and Li, J. and Jiang, W. and Morrison, J. F. and Smits, A. J. (2004) Further observations on the mean velocity distribution in fully developed pipe flow. Journal of Fluid Mechanics, 501 . pp. 135-147. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:MCKjfm04b
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The measurements by Zagarola & Smits (1998) of mean velocity profiles in fully developed turbulent pipe flow are repeated using a smaller Pitot probe to reduce the uncertainties due to velocity gradient corrections. A new static pressure correction (McKeon & Smits 2002) is used in analysing all data and leads to significant differences from the Zagarola & Smits conclusions. The results confirm the presence of a power-law region near the wall and, for Reynolds numbers greater than 230×10^3 (R+ >5×10^3), a logarithmic region further out, but the limits of these regions and some of the constants differ from those reported by Zagarola & Smits. In particular, the log law is found for 600<y+ <0.12R+ (instead of 600<y+ <0.07R+), and the von Kármán constant κ, the additive constant B for the log law using inner flow scaling, and the additive constant B∗ for the log law using outer scaling are found to be 0.421 ± 0.002, 5.60 ± 0.08 and 1.20 ± 0.10, respectively, with 95% confidence level (compared with 0.436±0.002, 6.15±0.08, and 1.51±0.03 found by Zagarola & Smits). The data also confirm that the pipe flow data for ReD ≤ 13.6×10^6 (as a minimum) are not affected by surface roughness.
|Additional Information:||Copyright © 2004 Cambridge University Press. Reprinted with permission. (Received 7 October 2002 and in revised form 19 September 2003). Published online 23 February 2004 The support of ONR under Grant Nos. N00014-98-1-0525, N00014-99-1-0340, and N00014-03-1-0320 is gratefully acknowledged. J.F.M. is indebted to the Engineering and Physical Sciences Research Council (grants GR/M64536/01 and GR/R48193/01), the Royal Academy of Engineering (England) and the Leverhulme Trust (grant F/07058/H) for financial support.|
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|Deposited On:||24 Aug 2006|
|Last Modified:||26 Dec 2012 08:59|
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