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http://dx.doi.org/10.5916/jkosme.2011.35.7.930

Turbulence Characteristics in a Circular Open Channel by PIV Measurements  

Kim, Sun-Gu (Graduate Student, Dept of Mechanical Engineering, Seoul Tech)
Sung, Jae-Yong (Dept of Mechanical Engineering, Seoul Tech)
Lee, Myeong-Ho (Dept of Mechanical Engineering, Seoul Tech)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.35, no.7, 2011 , pp. 930-937 More about this Journal
Abstract
The characteristics of mean velocity and turbulence have been analyzed in the circular open channel flow using PIV measurement data for a wide range of water depth. The measured data are fitted to a velocity distribution function over the whole depth of the open channel. Reynolds shear stress and mean velocity in wall unit are compared with the analytic models for fully-developed turbulent boundary layer. Both the mean velocity and Reynolds shear stress have different distributions from the two-dimensional boundary layer flow when the water depth increases over 50% since the influence of the side wall penetrates more deeply into the free surface. The cross-stream Reynolds normal stress also has considerably different distribution in view of its peak value and decreasing rate in the outer region whether the water depth is higher than 50% or not.
Keywords
Circular open channel; Particle image velocimetry; Reynolds stress; Friction velocity; Water depth;
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