Study of the turbulent flow structure around a standard Rushton impeller

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

Identyfikatory

DOI

10.2478/cpe-2014-0010

• Języki publikacji: EN

Abstrakty

EN

The velocity field around the standard Rushton turbine was investigated by the Laser Doppler Anemometry (LDA) and Particle Image Velocime try (PIV) measurements. The mean ensemble-averaged 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.

Słowa kluczowe

EN

Rushton turbine; mixing, ensemble-average mean velocity; fluctuation velocity; LDA/LDV; PIV; velocity profiles

PL

turbina Rushtona; mieszanie; wahanie prędkości; PRA / LDV; PIV; profil prędkości

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2014
• Tom: Vol. 35, nr 1
• Strony: 137--147
• Opis fizyczny: Bibliogr. 15 poz., wykr., tab.

Twórcy

autor

Kysela B.

• Institute of Hydrodynamics AS CR, v. v. i., Pod Patankou 30/5, Prague, Czech Republic

autor

Konfršt J.

• Institute of Hydrodynamics AS CR, v. v. i., Pod Patankou 30/5, Prague, Czech Republic

autor

Fořt I.

• Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technicka 4, Prague, Czech Republic

autor

Kotek M.

• Technical University of Liberec, Institute for Nanomaterials, Advanced Technology and Innovation, Studentska 1402/2, Liberec, Czech Republic

autor

Chára Z.

• Institute of Hydrodynamics AS CR, v. v. i., Pod Patankou 30/5, Prague, Czech Republic

Bibliografia

• 1. Ben-Nun R., Sheintuch M., 2013. Characterizing turbulent jet properties of radial discharge impeller: potential core, spreading rate and aver aged flow field parameters. 9th European Congress of Chemical Engineering, The Hague (NL), April 2013.
• 2. Bittins K., Zehner P., 1994. Power and discharge numbers of radial-flow impellers, Fluid-dynamic interactions between impeller and baffles. Chem. Eng. Proc., 33, 295-301. DOI: 10.1016/0255-2701(94)01011-0.
• 3. Cutter L.A., 1966. Flow and turbulence in stirred vessels. AICHE J., 12, 35-44.
• 4. Derksen J.J., Doelman M.S., Van den Akker H.E.A., 1999. Three-dimensional LDA measurement in the impeller region of a turbulently stirred tank. Exp. Fluids, 27, 522 -532. DOI: 10.1007/S003480050376.
• 5. Devi T.T., Kumar B., 2013. Comparison of flow patterns of dual Rushton and CD-6 impellers. Theor. Fund. Chem. Eng., 47, 344-355. DOI: 10.1134/S0040579513040210.
• 6. Drbohlav J., Fořt I., Krátký J., 1978. Turbine impeller as a tangential cylindrical jet. Coll. Czech. Chem. Commun., 43, 696-719.
• 7. Drbohlav J., Fořt I., Máca K., Ptáček J., 1978. Turbulent characteristics of discharge flow from turbine impeller. Coll. Czech. Chem. Commun., 43, 3148-3161.
• 8. Fořt I., Möckel H. O., Drbohlav J., Hrach M., 1979. The flow of liquid in a stream from the standard turbine impeller. Coll. Czech. Chem. Commun., 44, 700-710.
• 9. Kratěna J., Fořt I., 2004. Study of the discharge stream from a standard Rushton turbine impeller. Acta Polytechnica, 44, 39-47.
• 10. Obeid A., Fořt I., Bertrand J., 1983. Hydrodynamic characteristics of flow in systems with turbine impeller. Coll. Czech. Chem. Commun., 48, 568-577.
• 11. Ranade V., Perrard M., Sauze N. L., Xuereb C., Bertrand J., 2001. Trailing vortices of Rushton turbine: PIV measurements and CFD simulations with snapshot approach. Chem. Eng. Res. Des., 79, 3–12. DOI: 10.1205/026387601528471.
• 12. Schafer M., Hofken M., Durst F., 1997. Detailed LDV measurement for visualisation of the flow field within a stirred-tank reactor equipped with a Rushton turbine. Chem. Eng. Res. Des., 75, 729-736. DOI:10.1205/026387697524399.
• 13. Talaga J., Fořt I., 2012. The velocity field in the discharge stream from a Rushton turbine impeller. 14th European Conference on Mixing, Warszawa, 10-13 September 2012.
• 14. Venneker B.C., Derksen J.J., den Akker H.E.V., 2010. Turbulent flow of shear-thinning liquids in stirred tanks - The effects of Reynolds number and flow index. Chem. Eng. Res. Des., 88, 827–843. DOI: 10.1016/j.cherd.2010.01.002.
• 15. Wu H., Patterson G., 1989. Laser-Doppler measurements of turbulent-flow parameters in a stirred mixer. Chem. Eng. Sci., 44, 2207–2221. DOI: 10.1016/0009-2509(89)85155-3.