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2013 | 34 | 1 | 39-49
Article title

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

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Languages of publication
EN
Abstracts
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.
Publisher

Year
Volume
34
Issue
1
Pages
39-49
Physical description
Dates
published
1 - 03 - 2013
online
02 - 04 - 2013
Contributors
author
  • Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technicka 4, Prague, Czech Republic, jan.skocilas@fs.cvut.cz
author
  • Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technicka 4, Prague, Czech Republic
  • Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technicka 4, Prague, Czech Republic
References
  • Coronero M., Montante G., Paglianti A., Magelli F., 2011. CFD prediction of fluid flow and mixing in stirred tanks: Numerical issues about the RANS simulations. Comp. Chem. Eng., 35, 1959-1968. DOI: 10.1016/j.compchemeng.2010.12.007.[Crossref]
  • Harvey A.D., Lee C.K., Rogers S.E., 1995. Steady-state modeling and experimental measurement of a baffled impeller stirred tank. AIChE Journal, 41, 2177-2186. DOI: 10.1002/aic.690411002.[Crossref]
  • Fluent Inc., 2008. FLUENT 6.3 User's Guide.
  • Fořt I., 1986. Flow and turbulence in vessels with axial impellers, in: Uhl V.W., Gray J.B. (Eds.), Mixing, Theoryand Practice, Vol. III. Academic Press, New York, 133-197.
  • Fořt I., Jirout T., Cejp J., Čuprová D., Rieger F., 2005. Study of erosion wear of pitched blade impellers in solidliquid suspensions. Chem. Process Eng., 26, 437-450.
  • Fořt I., Kysela B., Jirout T., 2010. Flow characteristics of axial high-speed impellers. Chem. Process Eng., 31, 661-679.
  • Fořt I., Jirout T., 2011. The relation between the rate of erosion wear of a pitched blade impeller and its process characteristics. Chem. Eng. Res. Des., 89, 1929-1937. DOI: 10.1016/j.cherd.2011.01.024.[WoS][Crossref]
  • Hutchings I.M., 1987. Wear by particulates. Chem. Eng. Sci., 42, 869-878. DOI: 10.1016/0009-2509(87)80045-3.[Crossref]
  • Joshi J.B., Nere N.K., Rane Ch.V., Murthy B.N, Mathpati Ch.S., Patwardham A.W., Ranade V.V., 2011. CFD simulation of stirred tank: Comparison of turbulent models (Part II: Axial flow impellers, multiple impellers and multiphase dispersion). Can. J. Chem. Eng., 89, 754-816. DOI: 10.1002/cjce.20465.[WoS][Crossref]
  • Oshinowo A., Jaworski Z., Dyster K.N., Marshall E., Nienow A.W., 2000. Predicting the tangential velocity field in stirred tank using Multiple Reference Frames (MRF) model with validation by LDA measurements. Proc.10th European Conf. on Mixing. Delft, The Netherlands, July 2-5, 2000, 281-288.
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_cpe-2013-0004
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