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Experiments and numerical modeling of baffle configuration effects on the performance of sedimentation tanks

Razmi, A. M ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1139/cjce-2012-0176
  3. Publisher: 2013
  4. Abstract:
  5. The hydraulic efficiency of sedimentation basins is reduced by short-circuiting, circulation zones and bottom particleladen jets. Baffles are used to improve the sediment tank performance. In this study, laboratory experiments were used to examine the hydrodynamics of several baffle configurations. An accompanying numerical analysis was performed based on the 2-D Reynolds-averaged Navier-Stokes equations along with the k-ε turbulence closure model. The numerical model was supplemented with the volume-of-fluid technique, and the advection-diffusion equation to simulate the dynamics of particle-laden flow. Model predictions compared well with the experimental data. An empirical function was constructed to indicate the location and amount of sediment collected in the tank. Hydraulic performance was determined for given baffle locations and heights. The results revealed that, for the laboratory setup, a baffle half way along its length decreases its performance, while a baffle much closer to its inlet and with height 25~30% of water depth improves efficiency
  6. Keywords:
  7. Drinking water settling tank ; Hydraulic removal performance ; Particleladen flow ; Sedimentation ; Advection-diffusion equation ; Baffle configurations ; Baffled tank ; Laboratory experiments ; Particle laden flows ; Removal performance ; Reynolds averaged Navier-Stokes equation ; Turbulence closure models ; Experiments ; Hydrodynamics ; Numerical models ; Sedimentology ; Sediments ; Turbulent flow ; Settling tanks ; Empirical analysis ; Experimental study ; Flow control ; Hydraulic property ; Navier-Stokes equations ; Numerical model ; Performance assessment ; Reynolds number ; Simulation ; Water depth
  8. Source: Canadian Journal of Civil Engineering ; Volume 40, Issue 2 , 2013 , Pages 140-150 ; 03151468 (ISSN)
  9. URL: http://www.nrcresearchpress.com/doi/abs/10.1139/cjce-2012-0176#.VksMUS6Hi-E