The trajectory of a spherical particle settling freely in a circular cylindrical vessel is numerically analyzed to investigate the settling characteristics in a circular settling tank. Flow field used for calculation is a laminar one with recirculation in the circular vessel. The particles suspended in influent water almost settle while they traverse radially along the bottom wall, and some of the particles which enter a region where the vertical component of fluid flow is greater than the overflow rate travel recirculatingly or flow out, when the settling velocity of the particle in a still water is equal to the overflow Fate. From the numerical results, it is noted that in a practical settling tank, the settling process is similar to that of an ideal plain settling basin, and the settling efficiency is strongly influenced by the diameter ratio of the tank to the feedwell.
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