Coherent Structures in Compound Open-Channel Flows by Making Use of Particle-Tracking Visualization Technique

by Iehisa Nezu, (M.ASCE), Kyoto Univ, Kyoto, Japan,
Hiroji Nakagawa, Kyoto Univ, Kyoto, Japan,
Ken-ichi Saeki, Kyoto Univ, Kyoto, Japan,

Abstract: In this study, images of very small 100 μm diameter particles uniformly suspended in compound open-channel flows were recorded on an optic disc using a high-sensitive CCD camera and 2W Argon-ion laser slit illumination techniques. Instantaneous velocities at each point in the laser slit plane were measured from these continuous four images of one particle. This new technique called the 'Particle-Image Velocimetry (PIV)' seems to be very powerful to investigate space-time correlation structures of coherent vortices of turbulence using the conditional sampling method of quadrant motions of velocity components because simultaneous velocity components can be obtained at all grid points of arbitrary section plane of water flows.

Subject Headings: Particle velocity | Imaging techniques | Open channel flow | Fluid velocity | Turbulent flow | Water flow | Flow visualization | Flow measurement

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