2D Simulation of Effects of Position of Baffles on the Removal Rate of Solids in a Sedimentation Tank

In this paper, we use solid–liquid two-phase mixture model and the k-ε turbulence model to numerically simulate the effects of the position of baffles on the removal rate of solids in a sedimentation tank. The PISO algorithm is used to decouple velocity and pressure. The distribution of sludge concentration on different cross-sections is obtained by the proposed model.

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Numerical Simulation of Flow in a Horizontal Sedimentation Tank

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.3624 ◽

2011 ◽

Vol 130-134 ◽

pp. 3624-3627

Author(s):

W.L. Wei ◽

Zhang Pei ◽

Y.L. Liu

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Secondary Flow ◽

Mixture Model ◽

Turbulence Model ◽

Two Phase ◽

Sedimentation Tank ◽

Phase Mixture ◽

Good Agreement

In this paper, we use two-phase mixture model and the Realizable k-ε turbulence model to numerically simulate the advection secondary flow in a sedimentation tank. The PISO algorithm is used to decouple velocity and pressure. The comparisons between the measured and computed data are in good agreement, which indicates that the model can fully simulate the flow field in a sedimentation tank.

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2D Simulation of Flow and Sludge Distribution in a Circular Secondary Clarifier

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.468-471.798 ◽

2012 ◽

Vol 468-471 ◽

pp. 798-801

Author(s):

Y.L. Liu ◽

P. Zhang ◽

W.L. Wei

Keyword(s):

Velocity Field ◽

Secondary Flow ◽

Concentration Distribution ◽

Two Phase ◽

2D Simulation ◽

Proposed Model ◽

Secondary Clarifier ◽

Phase Mixture ◽

Solid Liquid ◽

Sludge Concentration

In this paper, we use solid–liquid two-phase mixture model and the Realizable k-ε turbulence model to numerically simulate the advection secondary flow and sludge concentration distribution in a circular secondary clarifier. The PISO algorithm is used to decouple velocity and pressure. The velocity field and the sludge concentration distribution are obtained by the proposed model.

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3D Numerical Simulation of Flow Field in a Circular Secondary Clarifier

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.393-395.1080 ◽

2011 ◽

Vol 393-395 ◽

pp. 1080-1083

Author(s):

Wen Li Wei ◽

Pei Zhang ◽

Yu Ling Liu

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Mixture Model ◽

Turbulence Model ◽

3D Numerical Simulation ◽

Two Phase ◽

Turbulence Flow ◽

Secondary Clarifier ◽

Phase Mixture

In this paper, we use two-phase mixture model and the 3D Realizable k-ε turbulence model to numerically simulate the advection secondary turbulence flow in a circular secondary clarifier. The PISO algorithm is used to decouple velocity and pressure. The results show that the model can provide a reference in designing sedimentation tanks.

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Numerical Prediction of Two-Phase Flow in Tube Bundles with a CFD Porous Media Approach Based on Mixture Model and a Void Fraction Correlation

E3S Web of Conferences ◽

10.1051/e3sconf/202132101002 ◽

2021 ◽

Vol 321 ◽

pp. 01002

Author(s):

Claire Dubot ◽

Vincent Melot ◽

Claudine Béghein ◽

Cyrille Allery ◽

Clément Bonneau

Keyword(s):

Porous Media ◽

Mixture Model ◽

Void Fraction ◽

Two Phase Flow ◽

Numerical Prediction ◽

Phase Flow ◽

Two Phase ◽

Mixture Density ◽

Tube Bundles ◽

Phase Mixture

Being able to predict the void fraction is essential for a numerical prediction of the thermohydraulic behaviour in steam generators. Indeed, it determines two-phase mixture density and affects two-phase mixture velocity which enable to evaluate the pressure drop of heat exchanger, the mass transfer and heat transfer coefficients. In this study, the flow is modelled by coupling Ansys Fluent with an in-house code library where a CFD porous media approach is implemented. In this code, the two-phase flow has been modelled so far using the Eulerian model. However, this two-phase model requires interaction laws between phases which are not known and/or reliable for a flow within a tube bundle. The aim of this paper is to use the mixture model, for which it is easier to implement suitable correlations for tube bundles. By expressing the relative velocity, as a function of slip, the void fraction model of Feenstra et al. developed for upward cross-flow through horizontal tube bundles is introduced. With this method, physical phenomena that occur in tube bundles are taken into consideration in the mixture model. The developed approach is validated based on the experimental results obtained by Dowlati et al.

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