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University of Melbourne
Abstract-
Recent work with the Princeton superpipe by Zagarola & Smits
(JFM 1998, vol. 373, p.33) using pitot tubes has shown that
the Karman constant is 0.436 and the smooth wall constant is 6.15
while the experiments of Osterlund, et al. (Phys Fluids 2000,
Vol.12, p.1) using hot-wires have shown that these constants
are 3.8 and 4.1. Work done at Melbourne University by Jones,
Marusic and Perry (JFM 2001, vol.468, p.1), show that mean
velocity profiles measured using pitot tubes disagreed with
profiles measured using hot-wires. The standard MacMillan
correction for probe displacement effects and a correction
for turbulence intensity were required for obtaining agreement
between the two sets of mean velocity profiles. This has
motivated us to re-analyse the superpipe data and to carry out
mean velocity measurements in a pipe and in a high Reynolds number
boundary layer wind tunnel. Results from these experiments
and the use of a curvefit by Nickels (2001, 14AFMC) for
mean velocity profiles in turbulent wall bounded flow will
be discussed.
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