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MEASUREMENT OF DEVELOPING TURBULENT FLOWS IN A ROTATING 90 DEGREE BEND WITH SQUARE CROSS-SECTION

Young Don Choi
Department of Mechanical Engineering, Korea University, 1, Anam-dong, Sungbuk-ku, Seoul 136-701, Korea

Kun Ho Chun
Department of Mechanical Engineering, Korea University 1, 5-Ka, Anam-dong Sungbuk-ku, SeouI, 136-701, Korea

Dong Chul Kim
Department of Mechanical Engineering, Korea University Sungpukku, Seoul, 136-701, Korea

Abstract

Mean velocity and Reynolds stress components of the developing turbulent flows in a rotating 90 degree bend with square cross-section were measured by a hot-wire anemometer. Effects of the centrifugal and Coriolis forces generated by the curvature and rotation of bend on the mean motion and turbulence structures are investigated experimentally. Results show that the Coriolis force associated with the rotation of the bend may act both through the mean motion and turbulent structures, thereby changing the pressure fields, mean and turbulent velocities distributions.