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The Effect of Surface Roughness on the Zero Pressure Gradient Turbulent Boundary Layers  

Kim Moon-Kyung (창원전문대학 기계설계과)
Yoon Soon-Hyun (부산대학교 기계공학부)
Kim Dong-Keon (부산대학교 대학원 기계공학과)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.29, no.4, 2005 , pp. 453-460 More about this Journal
Abstract
Experiments were conducted to investigate the effect of the surface roughness on the flat plate turbulent boundary layer. The square rods were installed at the leading edge to make surface roughness. The particle image velocimetry was used to measure the mean velocities and velocity fluctuation component. All measurements were made over a range of w/k=1. 2 5 and $Re_x=80.000{\sim}360,000$. Friction velocity was measured by using Clauser plot method. The level of turbulent intensities on roughness surface appears more strongly than that of turbulent intensities on flat plate. A correlation of boundary layer thickness in term of $Re_x$ and w/k are presented.
Keywords
Turbulent boundary layer; Surface roughness; Friction velocity; Particle image velocimetry;
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