Measurements and modelling of free-surface turbulent flows induced by a magnetic stirrer in an unbaffled stirred tank reactor

A route map for the assessment of crystallisation processes is presented. A theoretical background on solubility, meta-stable zone width, nucleation and crystal growth kinetics is presented with practical examples. The concepts of crystallisation hydrodynamics and the application of population balances and computational fluid dynamics for modelling crystallisation processes and their scaling up are also covered.

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“…It is the product of the anisotropy factor and the entropy change upon crystallisation: (27) where = anisotropy factor…”

Section: Burton Cabrera Frank (Bcf) Modelmentioning

confidence: 99%

Crystallisation Route Map

Corzo

Cai

Ramachandran

et al. 2017

Engineering Crystallography: From Molecule to Crystal to Functional Form

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“…Conventional agitated vessels used for carrying out various operations in chemical and process industries generally contain different types of baffles, for example, four flat vertical plates either fixed to or offset from the vessel wall and beavertail or finger baffle(s) away from the wall, to deter vortex formation and air entrainment and to enhance mixing (Mahmud et al, 2009). However, vessels without baffles are also used in many applications, such as fermentation, solid-liquid mass transfer, in the food and pharmaceutical industries, etc.…”

Section: Effect Of Vessel Configurationmentioning

confidence: 99%

“…Efficient design of stirred tank reactors requires knowledge of the hydrodynamic behavior of the flows in such apparatuses. To date, many efforts have been made in order to obtain data both by experimental and computational techniques (Bo et al, 2006;Escudie and Line, 2003;Escudie et al, 2004;Gabriele et al, 2009;Galletti et al, 2003;Mavros, 2001;Mahmud et al, 2009;Nikiforaki et al, 2003;Roy et al, 2010;Yeoh et al, 2004;Yoon et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Effect of Some Design Parameters on the Flow Fields and Power Consumption in a Vessel Stirred by a Rushton Turbine

Youcefi¹,

Bouzit²,

Ameur³

et al. 2013

Chemical and Process Engineering

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Knowledge of the fluid dynamic characteristics in a stirred vessel is essential for reliable design and scale-up of a mixing system. In this paper, 3D hydrodynamics in a vessel agitated by a Rushton turbine were numerically studied (with the help of a CFD computer program (CFX 13.0)). The study was carried out covering a wide Reynolds number range: 10 4 -10 5 . Computations, based on control volume method, were made using the k-ε model. Our main purpose was to investigate the effect of vessel configuration and agitation rates on the flow structure and power consumption. Three types of vessels were used: unbaffled, baffled and a vessel with slots placed at the external perimeter of its vertical wall. The effect of slot length has been investigated. The comparison of our predicted results with available experimental data shows a satisfactory agreement.

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“…An unbaffled magnetic rod-stirred reactor thus has been developed in the spent nuclear fuel reprocessing industry for use as a precipitator [1,2]. Precipitation reactions being very fast are well known to be highly sensitive to mixing effects.…”

Section: Introductionmentioning

confidence: 99%

Mixing Study in an Unbaffled Stirred Precipitator Using LES Modelling

Bertrand

Parmentier

Lebaigue

et al. 2012

International Journal of Chemical Engineering

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This paper describes the CFD modelling of a reactor operating in the nuclear industry using LES approach. The reactor consists of an unbaffled stirred tank reactor in which plutonium precipitation reactions are carried out. The flow generated in such a precipitator is complex and there is very little information available in the literature about unbaffled reactors stirred with magnetic rod. That is why a hydrodynamic modelling has been developed using computational fluid dynamics (CFD) in order to get accurate description of mixing phenomena inside the precipitator and therefore to be able to predict the solid particle properties. Due to the strong turbulence anisotropy, the turbulence transport simulation is achieved by a large eddy simulation (LES) approach which gives unsteady solutions. The numerical simulations are performed in 3D using the Trio U code developed at the Commissariat a l'Énergie Atomique. The predictive performances of the modelling are analysed through a mixing phenomena study. Both experimental and numerical studies are performed. This work shows how hydrodynamics inside the reactor can have a noticeable effect on the precipitate properties and how LES modelling is a very effective tool for the process control.

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Measurements and modelling of free-surface turbulent flows induced by a magnetic stirrer in an unbaffled stirred tank reactor

Cited by 69 publications

References 31 publications

Crystallisation Route Map

Crystallisation Route Map

Effect of Some Design Parameters on the Flow Fields and Power Consumption in a Vessel Stirred by a Rushton Turbine

Mixing Study in an Unbaffled Stirred Precipitator Using LES Modelling

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