Flow Visualization in Vortex Chamber

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Flow Visualization in Vortex Chamber

Original Article, B5
Chapokpour J., Farhoudi J., Amiri Tokaldany E., Majedi-Asl M.
  Journal. Civil Eng. Urban. 2(1): 26-34. 2012

ABSTRACT: This paper presents the results of experimental study that was accomplished in a vortex settling chamber to observe the flow structures. A polar grid of data accusation was designed to trace the velocity characteristics of the flow. An ADV three dimensional velocity measuring equipment was utilized. The experiments were conducted under four different discharges and three dimensional flow velocities were then measured. The different type secondary currents were detected in 2D manner at radial sections of vortex chamber. Additionally, it was tried to show a 3D appearance of velocity components inside the basin. It was found that flow structure of basin is highly dependent on entrance velocity. Two types of clockwise and anticlockwise vortices and some sink points combined with each other were observed in radial sections of chamber where their configurations and role were varied with flow discharge. To understand sediment trapping process in these basins, the streamlines and velocity vectors in the horizontal superimposed sections were drawn and analyzed then for motion of sediment particles the spiral settling path were observed. The 3D analyzing of sediment motion path has exhibited a different outcome from 2D analysis Such that there was not only any especial sediment motion path in the horizontal sections but also it was oriented towards up and down in its spiral circulation.
Keywords: Vortex basin, ADV velocity measuring equipment, Velocity distribution, Streamline, Sediment motion path.

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