Pumping capacity of pitched blade multi – stage impellers

• Autorzy: Jirout T.

Identyfikatory

DOI

10.2478/cpe-2014-0004

• Języki publikacji: EN

Abstrakty

EN

This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity and flow in the mixing bath in comparison with an independently operating pitched blade impeller with the same geometry. In case of a relatively close distance between Impellers H3/d= 0.5 - 0.75, the multi-stage impeller creates only one circulation loop and the impellers itself behave identically as pumps in series. However for relative higher distance of impellers than H3/d= 1.25, the multi-stage impeller creates two separated circulation loops.

Słowa kluczowe

EN

pitched blade impeller; multi-stage impeller; impeller pumping capacity; velocity; profile; laser Doppler anemometry

PL

wirnik wielostopniowy; wydajność pompowania wirnika; prędkość; profil; laser Dopplera

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2014
• Tom: Vol. 35, nr 1
• Strony: 47--53
• Opis fizyczny: Bibliogr. 14 poz., rys., tab.

Twórcy

autor

Jirout T.

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

Bibliografia

• 1. Bouaifi M., Roustan M., 2001. Power consumption, mixing time and homogenization energy in dual-impeller agitated gas-liquid reactors.Chem. Eng. Process., 40, 87-95. DOI: 10.1016/S0255-2701(00)00128-8.
• 2. Fořt I., 1986. Flow and turbulence in vessels with axial impellers, In: Uhl V.W., Gray J.B. (Eds.) Mixing, Theory and Practice, Vol. III. Academic Press, New York, pp. 133-197.
• 3. Fořt I., Hájek J., Machoň V., 1989. Energetic efficiency of two impellers on the same shaft in cylindrical baffled vessel of high height/diameter ratio. Collect. Czech. Chem. Commun., 54, 2345-2355.
• 4. Fořt I., Jirout T., Sperling R., Jambere S., Rieger F., 2002. Study of pumping capacity of pitched blade impellers. Acta Polytech., 42, 68-72.
• 5. Gogate P.R., Beenackers A.A.C.M., Pandit A.B., 2000. Multiple-impeller systems with a special emphasis on bioreactors: A critical review. Biochem. Eng. J., 6, 109-144. DOI: 10.1016/S1369-703X(00)00081-4.
• 6. Medek J., Fořt I., 1979. Pumping effect of impellers with flat inclined blades. Collect. Czech. Chem. Commun., 44, 3077-3089.
• 7. Moravec J., Jirout T., Rieger F., Kratky L., 2009. Mixing system for highly concentrated fine-grained suspensions. Polish J. Chem. Technol., 11, 52-56. DOI: 10.2478/v10026-009-0043-9.
• 8. Nienow A. W., 1997. On impeller circulation and mixing effectiveness in the turbulent flow regime. Chem. Eng. Sci., 22, 2557-2565. DOI: 10.1016/S0009-2509(97)00072-9.
• 9. Pan Ch., Min J., Liu X., Gao Z., 2008. Investigation of fluid flow in a dual Rushton impeller stirred tank using particle image velocimetry. Chin. J. Chem. Eng., 16, 693-699. DOI: 10.1016/S1004-9541(08)60142-1.
• 10. Seichter P., Pešl L., 2005. Navrhování rotačních míchadel – věda nebo rutina? CHEMagazín, 15, 8-11 (in Czech).
• 11. Vrábel P., van der Lans R.G.J.M., Luyben K.Ch.A.M., Boon L, Nienow A.W., 2000. Mixing in large-scale vessels stirred with multiple radial or radial and axial up-pumping impellers: Modeling and measurements. Chem. Eng. Sci., 55, 5881-5896. DOI: 10.1016/S0009-2509(00)00175-5.
• 12. Wu J., Zhu Y., Pullum L., 2001. The effect of impeller pumping and fluid rheology on solid suspension in a stirred vessel. Can. J. Chem. Eng., 79, 177-186. DOI: 10.1002/cjce.5450790201.
• 13. Wu J., Zhu Y., Pullum L., 2002. Suspension of high concentration slurry. AIChE J., 48, 1349-1352. DOI:10.1002/aic.690480620.
• 14. Xia J-Y., Wang Y-H., Zhang S-L., Chen N., Yin P., Zhuang Y-P., Chu J., 2009. Fluid dynamics investigation of variant impeller combinations by simulation and fermentation experiment. Biochem. Eng. J., 43, 252-260. DOI:10.1016/j.bej.2008.10.010.