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Experimental Determination of the Shear Rate in a Stirred Tank with a Non-Newtonian Fluid: Carbopol

Gabelle, Jean-Christophe and Morchain, Jérôme and Anne-Archard, Dominique and Augier, Frédéric and Liné, Alain Experimental Determination of the Shear Rate in a Stirred Tank with a Non-Newtonian Fluid: Carbopol. (2013) AIChE Journal, vol. 59 (n° 6). pp. 2251-2266. ISSN 0001-1541

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Official URL: http://dx.doi.org/10.1002/aic.13973

Abstract

The local shear rate generated in a cylindrical tank equipped with a Rushton turbine was investigated using particle image velocimetry in a shear-thinning fluid (Carbopol). This non-Newtonian fluid was used in an attempt to mimic fermentation broths. Three Reynolds numbers corresponding to the transition regime were investigated. The hydrodynamics is analyzed,and the velocity field is decomposed by proper orthogonal decomposition into mean flow, organized motion, and turbulence. Then, the contributions of each flow structure to the total dissipation of kinetic energy are presented. The spatial heterogeneity of shear rate is discussed and a new expression is proposed for shear rate. This work shows that the local shear rate is highly heterogeneous in a tank. Future works will need to focus on other types of stirrer and investigate the effect of scaling up reactors on the shear rate heterogeneity.

Item Type:Article
Additional Information:Thanks to Wiley editor. The original publication is available at http://onlinelibrary.wiley.com
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
French research institutions > IFP Energies Nouvelles - IFPEN (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Dominique ANNE ARCHARD
Deposited On:12 Jul 2013 11:59

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