Experimental investigation on turbulent flow in a circular-sectioned 90-degree bend |
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Authors: | K Sudo M Sumida H Hibara |
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Institution: | (1) Faculty of Engineering, Hiroshima University 1-4-1, Kagamiyama, Higashihiroshima, 739-8527, Japan, JP |
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Abstract: | The steady, turbulent flow in a circular-sectioned 90° bend with smooth walls has been investigated experimentally. The bend
had a curvature radius ratio of 4.0 with long, straight upstream and downstream pipes. The longitudinal, circumferential and
radial components of mean and fluctuating velocities, and the Reynolds stresses in the pipe cross section at several longitudinal
stations were obtained with the technique of rotating a probe with an inclined hot wire at a Reynolds number of 6×104. The velocity fields of the primary and secondary flows, and the Reynolds stress distributions in the cross section were
illustrated. Moreover, other characteristics of the bend flow, such as deviation of the primary flow and intensity of the
secondary flow, were presented. Simultaneously, discussions were given on the transition of phenomena in the longitudinal
direction and the structures of turbulence in the 90° bend.
Received: 21 April 1997/Accepted: 14 November 1997 |
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