1st International Conference on Modelling and Simulation on Engineering, Science and Technology (ICOMSEST) - Kuala Lumpur - Malaysia (2019-02-24)

The Numerical Modeling of Baffle Configuration Effects in the Primary Sedimentation Tanks
It is essential to have a uniform flow field for a settling tank with high performance. In general, however, the recirculation zones always appear in the sedimentation tanks. The non-uniformity of the velocity field, the short-circuiting at the surface and the motion of the jet at the bed of the tank that occurs because of the recirculation in the sedimentation layer, are affected by the geometry of the tank. One way to decrease the size of dead zone is using a suitable baffle configuration. In the first part of this study, the proper place of a single baffle in the tank was investigated numerically and in the next step the effect of existence of second baffle in the tank was tested. The results indicate that, the best position of the baffle is obtained when the volume of the recirculation region is minimized or is divided to smaller part and the flow field trend to be uniform in the settling zone to dissipate the kinetic energy in the tank.
Keywords: Sedimentation Tanks, Baffle Configuration, Numerical Modeling
Mahdi Shahrokhi and Fatemeh Rostami