Abstract
A comparison of the mean and axial turbulent intensity profiles in the flow of air and of water in a round pipe at the same Reynolds number of 50,000 was carried out. Results show the mean velocity profiles to be similar within the experimental accuracy of ±1·4 per cent. However, the axial intensity profiles, while similar up to a dimensionless radius of 0·6, diverged thereafter to a separation of about 15 per cent. These results bring into question the principle of Reynolds similarity with regard to turbulent velocity fluctuations.
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