پديدآورندگان :
Qanaatian jobzari Mohammad Mohammad.qanaatian@gmail.com Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran; , Daghbandan Allahyar Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran; , Yaghoubi Mehran Manager of Guilan water treatment, Rasht, Iran
كليدواژه :
Sedimentation tank , Computational fluid dynamics , Dam , Turbulence model
چكيده فارسي :
Computational fluid dynamics simulations are applied to determine the effect of adding a vertical dam at the feed section of a full-scale sedimentation tank for the improvement of flow patterns in potable water treatment. A general 2D CFD-based simulation strategy is developed based on the specific features and conditions met in practice for potable water treatment. As a case study, one of the sedimentation tanks of the potable water treatment of the city of Rasht (Guilan) is employed. Two turbulent models including k–epsilon and k–omega to investigate water behaviour are used. Contours of velocity and stream function have been determined by using these models. The results show that adding a vertical dam at the feed section decreases the inlet recirculation zone and enhances flow directions. It is noteworthy that even small differences in the inlet geometry can cause appropriate changes in sedimentation tank. Also the results show that k-omega model presented better flow pattern versus k-epsilon model. The improved flow pattern causes to increase tank efficiency.
