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Experimental investigation of baffle effect on the flow in a rectangular primary sedimentation tank

Jamshidnia, H ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. In primary sedimentation tanks, short-circuiting enlargement of dead zones and high flow mixing problems are caused by circulation regions (dead zones), which can reduce the optimal sedimentation of particles. For proper design of such tanks, the formation of recirculation zones should be avoided. The provision of a baffle as a geometrical modification of a tank may influence the flow field for better sedimentation. Thus, in this study, velocity measurements were performed by a three-dimensional Acoustic Doppler Velocimeter (ADV) to investigate baffle effects on the velocity distribution in a primary rectangular sedimentation tank, quantitatively. Effects of baffle positioning were also determined. Mean flow analysis shows how a baffle can alter the hydrodynamics of the flow field. It was quantitatively found that the intermediate baffle not only influences the flow field in its downstream, but also affects the flow pattern in its upstream. It was found that the baffle setting and its position relative to the inlet and outlet influences the flow field and the development of flow. Baffled flow may provide better conditions for sedimentation by influencing velocity profiles. However, further detailed experimental study is necessary to fully capture the baffle effect and obtain further insight into the complex flow field in a sedimentation tank
  5. Keywords:
  6. ADV ; Intermediate baffle ; Primary settling tank ; Reverse flow region ; Sedimentation tank ; Flow fields ; Sedimentation ; Settling tanks ; Velocimeters ; Velocity distribution ; Velocity measurement ; Inlet flow ; Acoustic Doppler Current Profiler ; Experimental study ; Flow modeling ; Flow pattern ; Hydrodynamics ; Mixing ; Recirculating system ; Sedimentation ; Velocity profile
  7. Source: Scientia Iranica ; Volume 17, Issue 4 B , 2010 , Pages 241-252 ; 10263098 (ISSN)
  8. URL: http://www.sid.ir/en/VEWSSID/J_pdf/955201004BM03.pdf