%0 Journal Article %A M. Shahrokhi and F. Rostami and M.A. Md Said and S. Syafalni %D 2011 %J International Journal of Environmental and Ecological Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 58, 2011 %T Numerical Investigation of Baffle Effect on the Flow in a Rectangular Primary Sedimentation Tank %U https://publications.waset.org/pdf/7954 %V 58 %X It is essential to have a uniform and calm flow field for a settling tank to have high performance. In general, the recirculation zones always occurred in sedimentation tanks. The presence of these regions may have different effects. The nonuniformity 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. There are some ways to decrease the size of these dead zones, which would increase the performance. One of the ways is to use a suitable baffle configuration. In this study, the presence of baffle with different position has been investigated by a finite volume method, with VOF (Volume of Fluid) model. Besides, the k-ε turbulence model is used in the numerical calculations. 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. %P 571 - 576