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Poster (Scientific congresses and symposiums)
CFD Modelisation of homogeneous distribution of solid particles in a stirred tank
Calvo, Sébastien; Delafosse, Angélique; Collignon, Marie-Laure et al.
20139th European Congress of Chemical Engineering / 2nd European Congress of Applied Biotechnology
 

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Keywords :
CFD; PIV; stirred Tank; solid dispersion; homogeneous suspension; scale-up; cuve agitée; dispersion solide; suspension homogène
Abstract :
[en] In this work, we study the conditions needed to reach homogeneous distribution of solid particles of aluminium salts in water inside a torospherical bottom shaped stirred tank reactor of 70L equipped with a Pfaudler RCI type impeller and three equi-spaced vertical baffles. The aim of the present study is to develop a CFD model describing the quality of particle distribution in industrial scale tanks. This model, validated with experimental data, is afterward used to developed scale-up and scale-down correlations to predict the minimum impeller speed needed to reach homogeneous solid distribution Nhs. The commercial CFD software Fluent 14 is used to model the fluid flow and the solid particle distribution in the tank. The 3D geometry of the tank and the associated mesh are respectively realized by Ansys 14 DesignModeler and Meshing. The Sliding-Mesh approach is used to take the impeller motion into account. Assuming that the discrete solid phase has no influence on the continuous liquid phase behaviour, the fluid flow dynamics may be simulated independently using the well-known k-ε turbulence model. The behaviour of the liquid-solid mixture is then described by implementing the Eulerian Mixture model. Liquid velocity fields simulated by CFD have been validated by comparison with PIV (Particle Image Velocimetry) measurements. Computed values of Nhs are compared with good agreement to experimental data obtained with a nephelometric probe. Results obtained at different scales allowed correlating the Nhs value to the volumetric power consumption.
Research center :
Laboratoire de Génie Chimique
Disciplines :
Chemical engineering
Author, co-author :
Calvo, Sébastien ;  Université de Liège - ULiège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques
Delafosse, Angélique ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Collignon, Marie-Laure ;  Université de Liège - ULiège > Département de chimie appliquée > Département de chimie appliquée
Crine, Michel ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires
Toye, Dominique  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques
Language :
English
Title :
CFD Modelisation of homogeneous distribution of solid particles in a stirred tank
Alternative titles :
[fr] Modélisation par CFD d'une suspension homogène de particules solides au sein d'une cuve agitée
Publication date :
24 April 2013
Number of pages :
A0
Event name :
9th European Congress of Chemical Engineering / 2nd European Congress of Applied Biotechnology
Event organizer :
MCI - Eurocongress v.o.f. Jan van Goyenkade 11 1075 HP Amsterdam The Netherlands
Event place :
The Hague, Netherlands
Event date :
April 21-25, 2013
Audience :
International
Available on ORBi :
since 06 June 2013

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