Abstract
The friction coefficient for fully developed turbulent flow of air through two elliptical ducts of aspect ratio 1·5 : 1 and 2 : 1 was measured for a Reynolds number range of 2 × 10 4−1·3 × 10 5 . The friction data compared with circular pipe correlations on the basis of a bulk Reynolds number using an equivalent diameter did not produce a unique correlation. The variation in local wall shear stress was measured by three different-sized Preston tubes using the more recent calibration proposed by Patel. Velocity distributions along the radial axes of each duct were plotted on inner and outer law co-ordinates. A unique logarithmic inner law showed the existence of wall similarity on each axis, whereas in the turbulent core Reynolds similarity was incomplete. Measurement of the velocity contours showed the existence of secondary flows.
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