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Turbulence structure over a particle roughness

Authors
Journal
International Journal of Multiphase Flow
0301-9322
Publisher
Elsevier
Publication Date
Volume
27
Issue
4
Identifiers
DOI: 10.1016/s0301-9322(00)00044-6
Keywords
  • Particle Roughness
  • Turbulence Structure
  • Similarity

Abstract

Abstract The effect of particle roughness on turbulence structure in a water boundary layer in an open channel flow is experimentally investigated using a laser-Doppler velocimeter (LDV). As a wall boundary, a fixed- or a free-particle wall is used against various particle-occupation densities ε. The results show that for the same ε the friction velocity on the fixed-particle wall is larger than that on the free-particle wall, and that both friction velocities have maxima in the region of 0.1⩽ ε⩽0.2. The Reynolds stress and turbulence intensities outside the roughness sublayer, normalized by the friction velocity, are independent of the particle roughness. The u– v quadrant decomposition technique elucidates that ejection events are superior to sweep events in the vicinity of the wall over smooth and free-particle walls, whereas over the fixed-particle wall the sweep events are more dominant in the production of the Reynolds stress than the ejection events.

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