Fluid Flow in a 180 deg Sharp Turning Duct With Different Divider Thicknesses

[+] Author and Article Information
Tong-Miin Liou, Yaw-Yng Tzeng, Chung-Chu Chen

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 30043

J. Turbomach 121(3), 569-576 (Jul 01, 1999) (8 pages) doi:10.1115/1.2841354 History: Received February 01, 1998; Online January 29, 2008


The effect of divider thickness on fluid flows in a two-pass smooth square duct with a 180 deg straight-corner turn is an important issue to the turbine blade internal cooling but has not been explored in the past. Laser-Doppler velocimetry measurements are thus presented for such a study at a Reynolds number of 1.2 × 104 and dimensionless divider thicknesses (Wd * ) of 0.10, 0.25, 0.50. Results are presented in terms of various mean velocity components in two orthogonal streamwise planes and three cross-sectional planes, the local and regional averaged turbulent kinetic energy and resultant mean velocity distributions, and complemented by the liquid crystal measured heat transfer coefficient contours. The measured velocity data are able reasonably to explain published and present measured heat transfer results. Wd * is found to have profound effects on the flow features inside and immediately after the turn. The turbulence level and uniformity in the region immediately after the turn respectively decrease and increase with increasing Wd * .

Copyright © 1999 by The American Society of Mechanical Engineers
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