Hydrodynamics and Metzner–Otto correlation in stirred vessels for yield stress fluids

Anne-Archard, Dominique; Marouche, Mohamed; Boisson, H. C.

doi:10.1016/j.cej.2006.08.002

Cited by 55 publications

(28 citation statements)

References 24 publications

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“…The numerical simulations carried out in geometries 2D made it possible to show the important significations by the viscoplastic behavior and in particular, the quasi immobilization of the fluids in a broad area when the effects of yield are dominant. It is worth nothing that this figure does not work if we 02101-p. 4 consider the mixture of two substances of this type of fluid.…”

Section: Discussionmentioning

confidence: 99%

Study of blades inclination influence of gate impeller with a non-Newtonian fluid of Bingham

Rahmani

Seghier

Draoui

et al. 2016

EPJ Web of Conferences

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Abstract.A large number of chemical operations, biochemical or petrochemical industry is very depending on the rheological fluids nature. In this work, we study the case of highly viscous of viscoplastic fluids in a classical system of agitation: a cylindrical tank with plate bottom without obstacles agitated by gate impeller agitator. We are interested to the laminar, incompressible and isothermal flows. We devote to a numerical approach carried out using an industrial code CFD Fluent 6.3.26 based on the method of finites volumes discretization of Navier -Stokes equations formulated in variables (U.V.P). The threshold of flow related to the viscoplastic behavior is modeled by a theoretical law of Bingham. The results obtained are used to compare between the five configurations suggested of power consumption. We study the influence of inertia by the variation of Reynolds number.

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Section: Discussionmentioning

confidence: 99%

Study of blades inclination influence of gate impeller with a non-Newtonian fluid of Bingham

Rahmani

Seghier

Draoui

et al. 2016

EPJ Web of Conferences

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“…Viscoplastic fluids (also called yield stress fluids) are an important class of non-Newtonian fluids. These fluids flow only when the shear stress is above a certain threshold, the yield stress, and this leads in particular to dead zones in the flow which lower mixing efficiency (Anne-Archard et al, 2006;Fuente et al, 1997). Agitation of such fluids as Xanthan gum solution results in the formation of a zone of intense motion around the impeller (the so called cavern) with essentially stagnant and/or slow moving fluids elsewhere (Pakzad et al, 2007).…”

Section: Introductionmentioning

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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“…Over the last two decades there has been a growing number of works based on numerical calculations using CFD techniques (Ameur et.al., 2015;Ameur, 2017;Anne-Archard et. al., 2006) or experimental work using modern measurement techniques (Takahashi et al, 2015;Wang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Optimization of geometric parameters of a ribbon impeller

Kuncewicz¹,

Stelmach²

2017

Chemical and Process Engineering

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Geometric parameters of a ribbon impeller were optimized on the basis of numerical calculations obtained from the solution of our own 3D/2D hybrid model. The optimization was made taking into account mixing power and homogenization time for ribbon impellers with a different number of ribbons and width operating in a laminar motion for Newtonian fluid. Due to minimum mixing energy required to stir a unit volume of liquid the most efficient impeller appeared to be that with one ribbon of width equal to 0.1 to 0.15 of the mixing vessel diameter. Impellers with more than one ribbon needed much higher mixing power but did not increase significantly secondary circulation in the vessel. These impellers increased first of all primary circulation, i.e. they increased only circular motion of liquid in the vessel.

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Hydrodynamics and Metzner–Otto correlation in stirred vessels for yield stress fluids

Cited by 55 publications

References 24 publications

Study of blades inclination influence of gate impeller with a non-Newtonian fluid of Bingham

Study of blades inclination influence of gate impeller with a non-Newtonian fluid of Bingham

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

Optimization of geometric parameters of a ribbon impeller

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