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A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

100%

Skočilas J., Fořt I., Jirout T.

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vol. 34

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issue 1

39-49

EN

This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (α = 45° and 30°) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors’ previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.

2

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

86%

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

Chemical and Process Engineering

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2014

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issue 1

3

A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

86%

Skočilas J., Fořt I., Jirout T.

Chemical and Process Engineering

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2013

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issue 1

4

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

86%

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

Chemical and Process Engineering

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2014

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vol. 35

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issue 1

137-147

EN

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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4 Chemical and Process Engineering

2 2014

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4 Fořt I.

2 Chára Z.

2 Jirout T.

2 Konfršt J.

2 Kotek M.

2 Kysela B.

2 Skočilas J.

A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

Study of the Turbulent Flow Structure around a Standard Rushton Impeller