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CFD simulation of turbulent velocity field in the discharge streem from a standard Rushton turbine impeller

100%

Kysela B., Fořt I., Konfršt J.

Czasopismo Techniczne

The velocity field around the standard Rushton turbine was investigated by the Computational Fluid Dynamics (CFD) calculations and compared with results obtained from the Laser Doppler Anemometry (LDA) measured in a pilot plant baffled cylindrical vessel. For calculations the Large Eddy Simulation (LES) approach was employed. The impeller motion was modeled using the Sliding Mesh technique (SM). The mean ensemble-averaged velocity profiles and root mean square values of fluctuations were compared in the radial discharge jet from the standard Rushton turbine under turbulent regime of flow of agitated liquid. There were found two subregions in the discharge stream and the values of the axial profiles of the radial component of the fluctuating velocity are rather same determined from the LES calculations and from the LDA measurements in the second one ZEF (zone of established flow) of the impeller discharge stream, but they differ in the first region ZFE (zone of flow establishment) in the impeller vicinity, although they exhibit the same shape. The impeller power number derived from calculations shows also good agreement with values introduced in literature with a significant influence of the thickness of the impeller disc.

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

88%

Kysela B., Konfršt J., Fořt I., Kotek M., Chára Z.

Chemical and Process Engineering

2014

vol. 35

issue 1

137-147

The velocity field around the standard Rushton turbine was investigated by the Laser Doppler Anemometry (LDA) and Particle Image Velocimetry (PIV) measurements. The mean ensembleaveraged velocity profiles and root mean square values of fluctuations were evaluated at two different regions. The first one was in the discharge stream in the radial direction from the impeller where the radial flow is dominant and it is commonly modelled as a swirling turbulent jet. The validity range of the turbulent jet model was studied. The second evaluated region is under the impeller where flow seems to be at first sight rather rigorous but obtained results show nonnegligible values of fluctuation velocity.

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1 Chemical and Process Engineering

1 Czasopismo Techniczne

1 2015

1 2014

2 Fořt I.

2 Konfršt J.

2 Kysela B.

1 Chára Z.

1 Kotek M.

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CFD simulation of turbulent velocity field in the discharge streem from a standard Rushton turbine impeller

Study of the Turbulent Flow Structure around a Standard Rushton Impeller