Simulation of mixing dynamics in agitated pulp stock chests using CFD

Ford, C.; Ein‐Mozaffari, Farhad; Bennington, C. P. J.; Taghipour, Fariborz

doi:10.1002/aic.10958

Cited by 62 publications

(72 citation statements)

References 5 publications

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“…However, the authors observed that the signal output computed using CFD deviated from measured output in flow situations containing significant channelling (Figure 15). Similar observations were reported for the mixing of pulp suspension in a rectangular chest equipped with a side-entering impeller (Ford et al, 2006). Two parameters have been widely used to quantify the performance of the continuous-flow mixing process: (i) the extent of channelling f in the vessel, and (ii) and the ratio of the fully-mixed volume fm V to the total volume t V of the fluid in the mixing tank (Ein-Mozaffari et al, 2004a, 2004b, 2007b.…”

Section: Analysis Of Mixing Timesupporting

confidence: 57%

“…The Herschel-Bulkley model causes numerical instability when the non-Newtonian viscosity blows up at small shear rates (Ford et al, 2006;Pakzad et al, 2008a;. This problem is surmounted by the modified Herschel-Bulkley model given by > (Ford et al, 2006;Pakzad et al, 2008a;.…”

Section: The Rheological Modelmentioning

confidence: 99%

“…This problem is surmounted by the modified Herschel-Bulkley model given by > (Ford et al, 2006;Pakzad et al, 2008a;.…”

Section: The Rheological Modelmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Mixing in Shear Thinning Fluids Using Computational Fluid Dynamics

Ein‐Mozaffari¹,

Upreti²

2010

Computational Fluid Dynamics

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Section: Analysis Of Mixing Timesupporting

confidence: 57%

Section: The Rheological Modelmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Mixing in Shear Thinning Fluids Using Computational Fluid Dynamics

Ein‐Mozaffari¹,

Upreti²

2010

Computational Fluid Dynamics

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“…However, the agreement found by Van Looy et al [19] was not good, with the CFD model in some cases underestimating the mixing time. Ford et al [20] and Gomez et al [21] studied the mixing and the flow field in a rectangular vessel equipped with a side-entering agitator, which are usually used in the pulp and paper industry, by applying CFD and PIV methods, and the results agreed quite well. To our knowledge, no work has been reported in the open literature on a combined PIV and CFD study of flow fields in stirred vessels with multiple side-entering agitators.…”

Section: Introductionmentioning

confidence: 89%

Experimental and Numerical Studies of the Flow Field in a Stirred Tank Equipped with Multiple Side‐Entering Agitators

2011

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The flow field and the macro-mixing process in a stirred tank equipped with four side-entering agitators were investigated experimentally and numerically. Experiments were conducted using two-dimensional particle image velocimetry (PIV) measurements to characterize the flow field at different positions in the vessel. The computational fluid dynamics (CFD) simulation was performed by the software Fluent 6.3, using the standard k-e turbulent model and the multiple reference frame together with the sliding mesh technique. The macro-mixing process was also discussed using CFD and decolorization experiments. The effects of the tracer detection positions and some mounting parameters in the mixing system were discussed. The results show that the mixing process was dominated by the flow field pattern in the stirred tank. According to the mixing times under different conditions using CFD simulation, the mounting parameters including inclination angle, plunging length and mounting height of the shaft were optimized.

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“…The Hershel-Bulkley model causes numerical instability when the non-Newtonian viscosity blows up at small shear rates (Ford et al, 2006;Pakzad et al, 2008;Saeed et al, 2008). This problem is surmounted by the modified Hershel-Bulkley model given by:…”

Section: Numerical Issuesmentioning

confidence: 99%

Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller

Ameur¹,

Bouzit²,

Helmaoui³

2011

Chemical and Process Engineering

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The present work deals with agitation of non-Newtonian fluids in a stirred vessel by Scaba impellers. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterise at every point flow patterns especially in the region swept by the impeller. A shear thinning fluid with yield stress was modelled. The influence of agitator speed, impeller location and blade size on the fluid flow and power consumption was investigated. The results obtained are compared with available experimental data and a good agreement is observed. It was found that an increase in blade size is beneficial to enlargement of the well stirred region, but that results in an increased power consumption. A short distance between the impeller and the tank walls limits the flow around the agitator and yields higher power consumption. Thus, the precise middle of the tank is the most appropriate position for this kind of impeller.

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Simulation of mixing dynamics in agitated pulp stock chests using CFD

Cited by 62 publications

References 5 publications

Investigation of Mixing in Shear Thinning Fluids Using Computational Fluid Dynamics

Investigation of Mixing in Shear Thinning Fluids Using Computational Fluid Dynamics

Experimental and Numerical Studies of the Flow Field in a Stirred Tank Equipped with Multiple Side‐Entering Agitators

Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller

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