The Flow in the Front Stagnation Region of a Square Plate with a Small Disturbing Wire in its Upstreamby T. C. Su, Florida Atlantic Univ, Boca Raton, United States,
Q. X. Lian, Florida Atlantic Univ, Boca Raton, United States,
Abstract: The flow in the front stagnation region of a square plate was investigated experimentally in a water channel. A small wire was placed in the upstream of the square plate to create a small but repeated disturbance. The flow pattern was investigated by the hydrogen bubble technique. It was observed that vorticity generated by the disturbing wire decelerated towards the stagnation region were merged into larger vortices. Through accumulation, the vortices ttlarged into a large vortex pair, with the size of the order of the plate, formed in the front stagnation region of the plate. The evolution of the large vortex pair involves three stages; its growing, equilibrium and the breaking stages. The process occurred repetitively in cycles.
Subject Headings: Plates | Vortices | Channel flow | Water flow | Rivers and streams | Flow measurement | Fluid flow | Flow patterns
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