LDV Measurements of Spatially Periodic Flows Over a Detached Solid-Rib Array

[+] Author and Article Information
Tong-Miin Liou, Chih-Ping Yang, Hsin-Li Lee

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

J. Fluids Eng 119(2), 383-389 (Jun 01, 1997) (7 pages) doi:10.1115/1.2819145 History: Received January 03, 1996; Revised June 06, 1996; Online December 04, 2007


Measurements of mean velocities, turbulence intensities, and Reynolds stresses are presented for spatially periodic flows in a duct of width-to-height ratio 2 with a detached solid-rib array. The Reynolds number based on the duct hydraulic diameter and cross-sectional bulk mean velocity (Ub ), the pitch to rib-height ratio, and the rib-height to duct-height ratio were 2 × 104 , 10, and 0.133, respectively. The rib-detached-distance to rib-height ratio was varied from 0 to 3.25 (duct axis) to study its effect on wake length and asymmetry, convective velocity and turbulent kinetic energy immediately behind the rib, maximum turbulent shear stress, and turbulence anisotropy. The results showed that the dominant fluid dynamic factors responsible for the reported peak values of local Nusselt number around the detached rib could be identified. Moreover, the turbulence structure parameter distribution and anisotropy were analyzed to examine the basic assumptions embedded in the turbulence models. Furthermore, the secondary-flow mean velocities were found to be one to two order of magnitude smaller than Ub .

Copyright © 1997 by The American Society of Mechanical Engineers
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