Laminar Mixing Performances of a Stirred Tank Equipped with Helical Ribbon Agitator Subjected to Steady and Unsteady Rotational Speed

This paper investigates the way of improving the mixing of highly viscous Newtonian fluids in a tank using suitable operating conditions (unsteady stirring approaches). The agitator used is a non standard helical ribbon impeller fitted with an anchor at the bottom. The degree of homogeneity in the t...

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Bibliographic Details
Published in:Chemical engineering research & design 2002, Vol.80 (4), p.335-344
Main Authors: Dieulot, J.-Y., Delaplace, G., Guerin, R., Brienne, J.-P., Leuliet, J.-C.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and Process Engineering
Chemical engineering
Engineering Sciences
Exact sciences and technology
Food engineering
helical ribbon impeller
Life Sciences
Mixing
Newtonian
unsteady stirring
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Summary:This paper investigates the way of improving the mixing of highly viscous Newtonian fluids in a tank using suitable operating conditions (unsteady stirring approaches). The agitator used is a non standard helical ribbon impeller fitted with an anchor at the bottom. The degree of homogeneity in the tank is followed using a conductivity method after a tracer injection. It is shown that the use of time-dependent rotational speed during the mixing process allows energy savings. For the unsteady stirring approaches tested, energy savings can reach up to 60% compared to the energy required to obtain the same mixing time with constant impeller rotational speed. Finally, a model is provided which allows the prediction of the mixing process of the agitated system with Newtonian fluids for both steady and unsteady stirring approaches.
ISSN:0263-8762
1744-3563
DOI:10.1205/026387602317446371