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Enhancement of Laminar Mixing in Stirred Vessel using Geometrical Perturbations

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Author(s): A. Hidalgo-Millán | B. Taboada | L. Vega-Alvarado | R. Zenit | Gabriel Ascanio

Journal: Journal of Applied Research and Technology
ISSN 1665-6423

Volume: 10;
Issue: 4;
Start page: 520;
Date: 2012;
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Keywords: Mixing | laminar flow | visualization | hydrodynamics | stirred vessels | eccentric impellers

ABSTRACT
Geometrical perturbations by using single and coaxial impellers configurations have been investigated in the laminarregime (Re = 2.68) in unbaffled stirred vessels. Combinations of one and two coaxial radial discharge flow impellersunder centered and eccentric conditions were studied with viscous Newtonian fluid. The study of geometricalperturbations has been made in terms of the mixing times, energy consumption and the flow fields. Homogenizationdegrees and mixing times, determined with a color-discoloration technique, were evaluated by means of imageprocessing. The flow fields were investigated using the particle image velocimetry technique. The use of off-centeredimpellers increases the pumping capacity; however, little effect of eccentricity was obtained when using two coaxialimpellers under off-centered conditions obtaining the best results with a novel configuration consisting of a dualturbine with connecting plates.
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