SHORT-CIRCUITING AND DENSITY INTERFACE IN PRIMARY CLARIFIERS

The unsteady flow regime and the temperature mixing in temperature-str atified settling tanks associated with a warm influent are investigate d by application of a numerical model with two different turbulence mo dels. The model consists of a series of conservation equations for flu id mass, momentum, and temperature, with one version using the algebra ic stress model and the other version using the conventional k-epsilon model. The simulation results are compared with existing experimental data for the temperature distribution. The velocity measurements were made under the same laboratory conditions that were used for the temp erature surveys. The experimental results are presented and compared w ith those predicted by the numerical model.