CFD Prediction of the Turbulent Flow Generated in Stirred Square Tank by a Rushton Turbine
- 1 National School of Engineers of Sfax (ENIS), Department of Mechanical Engineering, Laboratory of Electromechanical Systems (LASEM), Sfax, Tunisia
- 2 National School of Engineers of Sfax (ENIS), Department of Mechanical Engineering, Laboratory of Electromechanical Systems (LASEM), Sfax, Tunisia
- 3 National School of Engineers of Sfax (ENIS), Department of Mechanical Engineering, Laboratory of Electromechanical Systems (LASEM), Sfax, Tunisia
- 4 National School of Engineers of Sfax (ENIS), Department of Mechanical Engineering, Laboratory of Electromechanical Systems (LASEM), Sfax, Tunisia
Abstract
The Computational Fluid Dynamics (CFD) have been used in the analysis and design of agitated vessel. Most of the researches done in this area are limited to the baffled or unbaffled stirred tank. In this paper, we have been interested in studying of the new design. Particularly, the flow and turbulence fields in square vessel stirred by a standard Rushton turbine have been simulated by means of CFD techniques. The Navier-Stokes equations governing the phenomenon of transfer of momentum are solved by a discretization method for finite volume. The MRF approaches can be used in simulation of the steady state problem. The numerical results from the application of CFD code Fluent with the stationary approach Multi Reference Frame (MRF) are presented in the planes containing the blade. The validation of CFD results with experimental measurements showed a good agreement.
- Rushton, J.H., Costich, E.W. and Everett, H.J. (1950) Power Characteristics of Mixing Impellers. Chemical Engineering Progress, 46, 467-476.
- Montante, G., Lee, K.C., Brucato, A. and Yianneskis, M. (2004) Numerical Simulation of the Dependency of Flow Pattern on Impeller Clearance in Stirred Vessels. Chemical Engineering Science, 56, 3751-3770. http://dx.doi.org/10.1016/S0009-2509(01)00089-6
- Montante, G., Mostek, M., Jahoda, M. and Magelli, F. (2005) CFD Simulations and Experimental Validation of Homogenisation Curves and Mixing Time in Stirred Newtonian and Pseudoplastic Liquids. Chemical Engineering Science, 60, 2427-2437. http://dx.doi.org/10.1016/j.ces.2004.11.020
- Derkson, J. (2002) Confined and Agitated Swirling Flows with Applications in Chemical Engineering. Flow Turbulence and Combustion, 69, 3-33. http://dx.doi.org/10.1023/A:1022419316418
- Armenante, P.M., Changgen, L., Chou, C., Fort, I. and Medek, J. (1997) Velocity Profiles in a Closed, Unbaflled Vessel: Comparison between Experimental LDV Data and Numerical CFD Redictions. Chemical Engineering Science, 52, 3483-3492. http://dx.doi.org/10.1016/S0009-2509(97)00150-4
- Alcamo, R., Micale, G., Grisafi, F., Brucato, A. and Ciofalo, M. (2005) Large-Eddy Simulation of Turbulent Flow in an Unbaffled Stirred Tank Driven by a Rushton Turbine. Chemical Engineering Science, 60, 2303-2316. http://dx.doi.org/10.1016/j.ces.2004.11.017
- Yeoch, S.L., Papadakis, G. and Yianneskis, M. (2005) Determination of Mixing and Degree of Homogeneity in Stirred Vessels with Large Eddy Simulation. Chemical Engineering Science, 60, 2293-2302. http://dx.doi.org/10.1016/j.ces.2004.10.048
- Nagata, S. (1975) Mixing Principles and Applications. John Wiley & Sons Halstead Press, Japan.
- Mazzarotta, B. (1993) Comminution Phenomena in Stirred Sugar Suspensions. A.I.Ch.E. Symposium Series, 89, 112-117.
- Bakker, A., Fasano, J.B. and Myers, K.J. (1994) Effects of Flow Pattern on the Solids Distribution in a Stirred Tank. IChemE Symp Series, No. 136, 1-8.
- Kilander, J. and Rasmuson, A. (2005) Energy Dissipation and Macro Instabilities in a Stirred Square Tank Investigated Using an LE PIV Approach and LDA Measurements. Chemical Engineering Science, 60, 6844-6856. http://dx.doi.org/10.1016/j.ces.2005.02.076
- Kresta, S.M., Mao, D. and Roussinova, V. (2006) Batch Blend Time in Square Stirred Tanks. Chemical Engineering Science, 61, 2823-2825. http://dx.doi.org/10.1016/j.ces.2005.10.069