A Study of a Flow Field in a Circular Settling Tank : Free-settling of a Spherical Particle in a Flow Field Induced by Suction

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A laminar flow induced by suction at the center of a circular vessel and the trajectory of a spherical particle setting freely in it are studied with a view to developing a highly effective circular settling tank. The numerical results about the flow fields obtained by solving the vorticity transport equations in difference form show that recirculation flows occur along the lateral wall of the vessel, and the flow characteristics depend on the depth of the influent weir rather than on the average velocity in it. For the flow fields, agreement with the experimental velocity vectors obtained with the aid of dye-method is generally good. The trajectory of a particle in the vessel is simulated by the use of a calculated flow field. The trajectories of the particles with influent water are similar to those of an ideal plain settling basin, but the trends about requird time to settle are reversed.
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