bubble columns; non-Newtonian fluids; gas disengagement; flow patterns; electrical tomography
Abstract :
[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.
Disciplines :
Chemical engineering
Author, co-author :
Fransolet, E.
Crine, A.
Marchot, Pierre ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Systèmes polyphasiques
Toye, Dominique ; Université de Liège - ULiège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques
Language :
English
Title :
Analysis of gas holdup in bubble columns with non-Newtonian fluid using electrical resistance tomography and dynamic gas disengagement technique
Publication date :
November 2005
Journal title :
Chemical Engineering Science
ISSN :
0009-2509
eISSN :
1873-4405
Publisher :
Pergamon-Elsevier Science Ltd, Oxford, United Kingdom
Volume :
60
Issue :
22 Sp. Iss. SI
Pages :
6118-6123
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
MESURES HYDRODYNAMIQUES ET MODÉLISATION STOCHASTIQUE DANS LES SYSTÈMES POLYPHASIQUES DU GÉNIE DES PROCÉDÉS
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Bolton, G.T., Hooper, C.W., Mann, R., Stitt, E.H., Flow distribution and velocity measurements in a radial flow fixed bed reactor using electrical resistance tomography (2004) Chemical Engineering Science, 59, pp. 1989-1997
Bukur, D., Patel, S.A., Hydrodynamic studies with foaming and non-Newtonian solutions in bubble columns (1989) The Canadian Journal of Chemical Engineering, 67, pp. 741-751
Daly, J.G., Patel, S.A., Bukur, D.B., Measurement of gas holdups and sauter mean bubble diameter in bubble column reactors by dynamic gas disengagement method (1992) Chemical Engineering Science, 47 (13-14), pp. 3647-3654
Eickenbusch, H., Brunn, P.-O., Schumpe, A., Mass transfer into viscous pseudoplastic liquid in large-diameter bubble columns (1995) Chemical Engineering Processing, 34, pp. 479-485
Fransolet, E., Crine, M., L'Homme, G., Toye, D., Marchot, P., Analysis of electrical resistance tomography measurements obtained on a bubble column (2001) Measurement Science and Technology, 12, pp. 1055-1060
Godbole, S.P., Honath, M.F., Shah, Y.T., Holdup structure in highly viscous Newtonian and non-Newtonian liquids in bubble columns (1982) Chemical Engineering Communications, 16, pp. 119-134
Mann, R., Williams, R.A., Dyakowski, T., Dickin, F.J., Edwards, R.B., Development of mixing models using electrical resistance tomography (1997) Chemical Engineering Science, 52 (13), pp. 2073-2085
Patel, S.A., Daly, J.G., Bukur, D.B., Holdup and interfacial area measurements using dynamic gas disengagement (1989) A.I.Ch.E. Journal, 35 (6), pp. 931-942
Schumpe, A., Grund, G., The gas disengagement technique for studying gas holdup structure in bubble columns (1986) The Canadian Journal of Chemical Engineering, 64, pp. 891-896
Syaiful, S., Reinhold, G., Bascoul, A., Wilhelm, A.M., Delmas, H., Gradient de vitesse moyen et transfert gaz-liquide non newtonien en fluidisation triphasique et colonnes à bulles (1990) Récents Progrès en Génie des Procédés, 4 (10), pp. 51-56
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.