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1

Local Turbulent Energy Dissipation Rate in a Vessel Agitated by a Rushton Turbine

100%

Šulc R., Pešava V., Ditl P.

Chemical and Process Engineering

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2015

|

vol. 36

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issue 2

135-149

EN

The scaling of turbulence characteristics such as turbulent fluctuation velocity, turbulent kinetic energy and turbulent energy dissipation rate was investigated in a mechanically agitated vessel 300 mm in inner diameter stirred by a Rushton turbine at high Reynolds numbers in the range 50 000 < Re < 100 000. The hydrodynamics and flow field was measured using 2-D TR PIV. The convective velocity formulas proposed by Antonia et al. (1980) and Van Doorn (1981) were tested. The turbulent energy dissipation rate estimated independently in both radial and axial directions using the one-dimensional approach was not found to be the same in each direction. Using the proposed correction, the values in both directions were found to be close to each other. The relation ε/(N3·D2) ∞ const. was not conclusively confirmed.

2

The effect of process conditions on the flocculation process occurring in an agitated vessel

86%

Šulc R., Ditl P.

Polish Journal of Chemical Technology

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2012

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vol. 14

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issue 3

88-96

EN

The effect of flocculation time, flocculant dosage, pollutant concentration, mixing intensity and tank size on flocculation performance was experimentally studied in a mechanically agitated vessel. The macroscopic approach was applied for fl occulation modelling. The simple semi-empirical generalized correlation for flocculation kinetics proposed by Šulc (2003a) and the simple semi-empirical generalized correlation quantifying the effect of flocculation time and flocculant dosage on fl occulation proposed by Šulc, Ditl (2007) were used for data treatment.

3

Local Turbulent Energy Dissipation Rate in a Vessel Agitated by a Rushton Turbine

86%

Šulc R., Pešava V., Ditl P.

Chemical and Process Engineering

|

2015

|

issue 2

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

|

2014

|

issue 1

5

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

|

2014

|

vol. 35

|

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

1 Polish Journal of Chemical Technology

2 2015

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1 2012

3 Ditl P.

3 Šulc R.

2 Chára Z.

2 Fořt I.

2 Konfršt J.

2 Kotek M.

2 Kysela B.

2 Pešava V.

Local Turbulent Energy Dissipation Rate in a Vessel Agitated by a Rushton Turbine

The effect of process conditions on the flocculation process occurring in an agitated vessel

Local Turbulent Energy Dissipation Rate in a Vessel Agitated by a Rushton Turbine

Study of the Turbulent Flow Structure around a Standard Rushton Impeller

Study of the Turbulent Flow Structure around a Standard Rushton Impeller