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2011 | 32 | 4 | 311-319

Article title

A study on blending characteristics of axial flow impellers


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This paper presents an analysis of the blending characteristics of axial flow high-speed impellers under a turbulent regime of flow of an agitated low viscosity liquid. The conductivity method is used to determine the time course of blending (homogenisation) of miscible liquids in a pilot plant fully baffled mixing vessel, and a torquemeter is used for measuring the impeller power input in the same system. Four-blade and six-blade pitched blade impellers and three high efficiency axial flow impellers are tested for the given degree of homogeneity (98%).The experimental results and also the results of the authors' previous study, in accordance with the theoretical approach described in the literature, show that there is a universal relationship between the impeller power number and the dimensionless blending time, taking into consideration the impeller-to-vessel diameter ratio, independent of the geometry of the axial flow impeller but dependent on the degree of homogeneity. This relationship is found to be valid on a pilot plant scale under a turbulent flow regime of an agitated liquid.









Physical description


1 - 12 - 2011
15 - 2 - 2012


  • Faculty of Mechanical Engineering, Department of Process Engineering, Czech Technical University in Prague, Technická 4, 166 07 Prague 6, Czech Republic
  • Faculty of Mechanical Engineering, Department of Process Engineering, Czech Technical University in Prague, Technická 4, 166 07 Prague 6, Czech Republic


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  • Mavros P., Xuereb C., Fořt I., Bertrand J., 2002. Investigation by laser Doppler velocimetry of the effects of liquid flow rates and feed positions on the flow patterns induced in a stirred tank by an axial - flow impeller. Chem. Eng. Sci., 57, 3939-3952. DOI: 10.1016/0009-2509(02)00268-3.[Crossref]
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