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PIV measurements in an aerated tank stirred by a down- and up-pumping axial flow impeller

Aubin, Joelle and Le Sauze, Nathalie and Bertrand, Joël and Fletcher, David F. and Xuereb, Catherine PIV measurements in an aerated tank stirred by a down- and up-pumping axial flow impeller. (2004) Experimental Thermal and Fluid Science, vol. 2 (n° 5). pp. 447-456. ISSN 0894-1777

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Official URL: http://dx.doi.org/10.1016/j.expthermflusci.2001.12.001

Abstract

Liquid phase hydrodynamics in an aerated tank stirred by a down- and an up-pumping pitched blade turbine have been investigated using Particle Image Velocimetry. The effect of agitator configuration and the gas phase on the mean velocity fields and turbulent quantities in the vessel have been investigated. The global mean gas holdup has also been evaluated for the two pumping conditions. For the gas flow rate used, the presence of gas only slightly alters the liquid flow patterns produced by both the down- and up-pumping configurations and causes a general decrease in the mean liquid velocities. The turbulent kinetic energy in the impeller discharge region was not affected by the presence of gas, but in the bulk of the tank, aeration caused a decrease in this value. Global gas holdup was found to be ~36% greater for the up-pumping impeller and a large amount of gas was found to be entrained by the primary circulation loop.

Item Type:Article
Additional Information:This publication is available on http://www.sciencedirect.com/science/journal/08941777
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > University of New South Wales - UNSW (AUSTRALIA)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Joelle Aubin-cano

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