Reference : Analysis of gas holdup in bubble columns with non-Newtonian fluid using electrical re...
Scientific journals : Article
Engineering, computing & technology : Chemical engineering
http://hdl.handle.net/2268/22135
Analysis of gas holdup in bubble columns with non-Newtonian fluid using electrical resistance tomography and dynamic gas disengagement technique
English
Fransolet, E. [> > > >]
Crine, A. [> > > >]
Marchot, Pierre mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Systèmes polyphasiques >]
Toye, Dominique mailto [Université de Liège - ULg > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques >]
Nov-2005
Chemical Engineering Science
Pergamon-Elsevier Science Ltd
60
22 Sp. Iss. SI
6118-6123
Yes (verified by ORBi)
International
0009-2509
Oxford
[en] bubble columns ; non-Newtonian fluids ; gas disengagement ; flow patterns ; electrical tomography
[en] This paper presents an experimental analysis of the influence of the liquid rheology on the gas flow pattern in a bubble column reactor. Aqueous solutions of xanthan are selected as an example of non-Newtonian shear thinning fluid. Averaged gas holdup is determined by two experimental techniques: parietal pressure probes and electrical resistance tomography (ERT). ERT is also used to provide 2D images of the gas phase distribution in a column cross-section. Bubble size distributions are evaluated by a gas disengagement technique using the parietal pressure probes. All these techniques clearly show the gas flow pattern is different in Newtonian and non-Newtonian fluids. Gas holdup values decrease when increasing the liquid viscosity and reach a minimum or a plateau. Homogeneous flow regime, observed in water at low gas velocities, tends to disappear when viscosity increases. This evolution is visualized by a much less isotropic distribution of the gas phase within cross-section of the column and by the appearance of much larger bubbles due to an increased coalescence phenomenon. (c) 2005 Elsevier Ltd. All rights reserved.
Communauté française de Belgique - CfB
MESURES HYDRODYNAMIQUES ET MODÉLISATION STOCHASTIQUE DANS LES SYSTÈMES POLYPHASIQUES DU GÉNIE DES PROCÉDÉS
Researchers ; Professionals
http://hdl.handle.net/2268/22135

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