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Effect of Axial Agitator Configuration (Up-Pumping, Down-Pumping, Reverse Rotation) on Flow Patterns Generated in Stirred Vessels

Aubin, Joelle and Mavros, Paul and Fletcher, David F. and Bertrand, Joël and Xuereb, Catherine Effect of Axial Agitator Configuration (Up-Pumping, Down-Pumping, Reverse Rotation) on Flow Patterns Generated in Stirred Vessels. (2001) Chemical Engineering Research and Design, vol. 7 (n°8). pp. 845-856. ISSN 0263-8762

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Official URL: http://dx.doi.org/10.1205/02638760152721046

Abstract

Single phase turbulent flow in a tank stirred with two different axial impellers - a pitched blade turbine (PBT) and a Mixel TT (MTT)- has been studied using Laser Doppler Velocimetry. The effect of the agitator configuration, i.e. up-pumping, down-pumping and reverse rotation, on the turbulent flow field, as well as power, circulation and pumping numbers has been investigated. An agitation index for each configuration was also determined. In the down-pumping mode, the impellers induced one circulation loop and the upper part of the tank was poorly mixed. When up-pumping, two circulation loops are formed, the second in the upper vessel. The PBT pumping upwards was observed to have a lower flow number and to consume more power than when down-pumping, however the agitation index and circulation efficiencies were notably higher. The MTT has been shown to circulate liquid more efficiently in the up-pumping configuration than in the other two modes. Only small effects of the MTT configuration on the power number, flow number and pumping effectiveness have been observed.

Item Type:Article
Additional Information:Source : 4th International Symposium on Mixing in Industrial Processes (ISMIP), N°4, Toulouse, FRANCE (14/05/2001) Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com. Chemical Engineering Research and Design homepage : http://www.elsevier.com/wps/find/journaldescription.cws_home/713871/description#description
Audience (journal):International peer-reviewed journal
Audience (conference):International conference without published proceedings
Uncontrolled Keywords:
Institution:Other partners > University of Sydney (AUSTRALIA)
Other partners > Aristotle University of Thessaloniki (GREECE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Joelle Aubin-cano

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