Mixing Analysis in a Stirred Tank Using Computational Fluid Dynamics


In this study computational fluid dynamics (CFD) approach was used to study mixing in an Industrial gold leaching tank. The objective was to analyze the extent of mixing in the tank by producing visual images of the various mixing zones in the tank domain. Eddy viscosity plots that characterise the extent of mixing in the tank were generated in the flow field obtained by an Eulerian-Eulerian approach. The extent of mixing was found to be greatest in the circulation loops of the impeller discharge region and least at the top and bottom portions of the tank. Trailing vortices that contribute to some level of mixing were identified in between the impeller blades. This approach could be used to enhance optimum design of mixing vessels and to eliminate the need for pilot plants.

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Dagadu, C. , Stegowski, Z. , Sogbey, B. and Adzaklo, S. (2015) Mixing Analysis in a Stirred Tank Using Computational Fluid Dynamics. Journal of Applied Mathematics and Physics, 3, 637-642. doi: 10.4236/jamp.2015.36076.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Rihani, R., Legrand, J. and Bensmaili, A. (2009) Mixing in Milli Torus Reactor under Aerated Conditions. Chemical Engineering and Processing, 48, 1012-1019.
[2] Kuncewicz, C., Szulc, K. and Kurasinski, T. (2005) Hydrodynamics of the Tank with a Screw Impeller. Chemical Engineering and Processing, 44, 766-774.
[3] Distelho, M.F.W. and Marquis, A.J. (2000) Scalar Mixing in the Vicinity of Two Disk Turbines and Two Pitched Blade Impellers. Chemical Engineering Science, 55, 1905-1920.
[4] Jayanti, S. (2001) Hydrodynamics of Jet Mixing in Vessels. Chemical Engineering Science, 56, 193-210.
[5] Delvigne, F., Destain, J. and Thonart, P. (2005) Structured Mixing Model for Stirred Bioreactors: An Extension to the Stochastic Approach. Chemical Engineering Journal, 113, 1-12.
[6] Raju, R., Balachandar, S., Hill, D.F. and Adriana, R.J. (2005) Reynolds Number Scaling of Flow in a Stirred Tank with Rushton Turbine. Part II—Eigen Decomposition of Fluctuation. Chemical Engineering Science, 60, 3185-3198.
[7] Gavrilescu, M., Radu, Z. and Tudose, R.Z. (1999) Residence Time Distribution of the Liquid Phase in a Concentric-Tube Airlift Reactor. Chemical Engineering and Processing, 38, 225-238.
[8] Stegowski, Z. and Furman L. (2004) Radioisotope Tracer Investigation and Modelling of Copper Concentrate Dewatering Process. International Journal of Mineral Processing, 73, 37-43.
[9] Pant, H.J., Sharma, V.K., Vidya Kamudu, M., Prakash, S.G., Krishanamoorthy, S., Anandam, G., Seshubabu Rao, P., Ramani, N.V.S., Singh, G. and Sonde, R.R. (2009) Investigation of Flow Behavior of Coal Particles in a Pilot-Scale Fluidized Bed Gasifier (FBG) Using Radiotracer Technique. Applied Radiation and Isotopes, 67, 1609-1615.
[10] Sugiharto, S., Suud, Z., Kurniadi, R., Wibisono, W. and Abidin, Z. (2009) Radiotracer Method for Residence Time Distribution Study in Multiphase Flow System. Applied Radiation and Isotopes, 67, 1445-1448.
[11] Ghiyas, U.D., Imran, R.C., Mansoor, H.I. and Iqbal, H.K. (2009) Study of Axial Mixing, Holdup and Slip Velocity of Dispersed Phase in a Pulsed Sieve Plate Extraction Column Using Radiotracer Technique. Applied Radiation and Isotopes, 67, 1248-1253.
[12] de Andrade Lima, L.R.P. and Hodouin, D. (2005) Residence Time Distribution of a Mechanically Agitated Cyanidation Tank. Minerals Engineering, 18, 613-621.
[13] Dagadu, C.P.K., Akaho, E.H.K., Danso, K.A., Stegowsk, Z. and Furman, L. (2012) Radiotracer Investigation in Gold Leaching Tanks. Applied Radiation and Isotopes, 70, 156-161.
[14] Dagadu, C.P.K., Stegowsk, Z., Furman, L., Akaho, E.H.K. and Danso, K.A. (2014) Determination of Flow Structure in a Gold Leaching Tank by CFD Simulation. Journal of Applied Mathematics and Physics, 2, 510-519.
[15] Khopkar, A.R., Mavros, P., Ranade, V.V. and Bertrand, J. (2004) Simulation of Flow Generated by an Axial Flow Impeller: Batch and Continuous Operation. Chemical Engineering Research and Design, 82, 737-751.
[16] Meroney, R.N. and Colorado, P.E. (2009) CFD Simulation of Mechanical Draft Tube Mixing in Anaerobic Digester Tanks. Water Research, 43, 1040-1050.
[17] Deglon, D.A. and Meyer, C.J. (2006) CFD Modelling of Stirred Tanks: Numerical Considerations. Minerals Engineering, 19, 1059-1068.
[18] ANSYS Fluent Inc. (2006) Fluent 6.3 User’s Manual. Fluent Inc. Centrera Resource Park, 10 Cavendish Court, Lebanon, USA.
[19] Yeoh, S.L., Papadakis, G. and Yianneskis, M. (2004) Numerical Simulation of Turbulent Flow Characteristics in a Stirred Vessel Using the LES and RANS Approaches with the Sliding/Deforming Mesh Methodology. Chemical Engineering Research and Design, 82, 834-848.
[20] Vrabel, P., van der Lans, R.G.J.M., Luyben, K.C.A.M., Boon, L. and Nienow, A.W. (2000) Mixing in Large-Scale Vessels Stirred with Multiple Radial or Radial and Axial Up-Pumping Impellers: Modelling and Measurements. Chemical Engineering Science, 55, 5881-5896.

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