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Three-dimensional simulation of the water flow field and the suspended-solids concentration in a circular sedimentation tank

Wang, Xiaoling ; Zhou, Shasha ; Zhang, Ziqiang ; Sun, Yuefeng ; Cao, Yuebo

Canadian journal of civil engineering, 2011-07, Vol.38 (7), p.825-836 [Periódico revisado por pares]

Ottawa, ON: NRC Research Press

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Título:
Three-dimensional simulation of the water flow field and the suspended-solids concentration in a circular sedimentation tank
Autor: Wang, Xiaoling ; Zhou, Shasha ; Zhang, Ziqiang ; Sun, Yuefeng ; Cao, Yuebo
Assuntos: 3-D CFD simulation ; Analysis ; Applied sciences ; Buildings. Public works ; circular sedimentation tank ; Civil engineering ; Computation methods. Tables. Charts ; Computational fluid dynamics ; concentration de matières en suspension ; courant de densité ; cuve de sédimentation cylindrique ; Density ; density current ; Dispersion ; Exact sciences and technology ; Fluid dynamics ; Fluid flow ; Hydraulic constructions ; Hydraulic measurements ; Kinetic energy ; Kinetics ; Mathematical models ; process of sludge settling ; processus de sédimentation des boues ; Sedimentation ; Settling ; Simulation ; simulation tridimensionnelle dynamique des fluides ; Structural analysis. Stresses ; suspended solids concentration ; Three dimensional ; Turbulent flow
É parte de: Canadian journal of civil engineering, 2011-07, Vol.38 (7), p.825-836
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: In this paper, a 3-D computational fluid dynamics (CFD) model of a circular sedimentation tank is presented, where the interfacial momentum transfers, buoyant forces, and the effect of sediment-induced density currents were included in the model. A convection–dispersion equation governed the mass transfer in the clarifier, and the double-exponential law was used to describe the settling velocity dependence on the concentration. The predicted values in the radial and axial directions and the solids distribution were in satisfactory agreement with experimental results from Deininger. The results showed that the tangential velocity distribution was not uniform, and the surface return flow was identified. The turbulent kinetic energy was relatively large and decreased drastically in the inlet zone, whereas the turbulent kinetic energy was relatively small in the settling zone. A density current was also formed. Furthermore, the influence of the inlet baffle length and location on suspended solids settling is discussed.
Editor: Ottawa, ON: NRC Research Press
Idioma: Inglês

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Three-dimensional simulation of the water flow field and the suspended-solids concentration in a circular sedimentation tank

Wang, Xiaoling ; Zhou, Shasha ; Zhang, Ziqiang ; Sun, Yuefeng ; Cao, Yuebo

Ottawa, ON: NRC Research Press

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