CFD Study of Turbine Submergence Effects on Aeration of a Stirred Tank
For many chemical and biological processes, the understanding of the mixing phenomenon and flow behavior in a stirred tank is of major importance. A three-dimensional numerical study was performed using the software Fluent, to study the flow field in a stirred tank with a Rushton turbine. In this work, we first studied the flow generated in the tank with a Rushton turbine. Then, we studied the effect of the variation of turbine’s submergence on the thermodynamic quantities defining the flow field. For that, four submergences were considered, while maintaining the same rotational speed (N =250rpm). This work intends to optimize the aeration performances of a Rushton turbine in a stirred tank.
[1] Nagata, S. (1975) "Mixing: Principles and Applications". New York :
Halstead Press.
[2] Lane G.L, Schwarz M.P. and Evans G.M. Comparison of CFD method
for modeling of stirred tanks, Proc. 10th European Conference on
Mixing, Delft, the Netherlands, 2000, 197-204.
[3] Ljungqvist M., Rasmuson A. Numerical Simulation of the Two-Phase
Flow in an Axially Stirred Vessel," Trans IChemE, 2001, 79, Part A, pp.
533-546.
[4] Khopkar A., Aubin J., Rubio-Atoche C., Xuereb C., Le Sauze N.,
Bertrand J. and Ranade V.V. Flow Generated by Radial Flow Impellers:
PIV Measurements and CFD Simulations. International Journal of
Chemical Reactor Engineering, 2004, Vol. 2: A18
[5] Dhainaut, Marc; Tetlie, Pål; and Bech, Knut. Modeling and
Experimental Study of a Stirred Tank Reactor, International Journal of
Chemical Reactor Engineering, 2005, Vol. 3: A61.
[6] Ranade, V. V. (1997) "An efficient computational model for simulating
flow in stirred vessels: a case of Rushton turbine," Chemical Enginering
Science. Elsevier Science Ltd, Vol. 52, 24.
[7] Schafer, M., Hofken, M. and Durst, F. (1997) "Detailed LDV
measurements for visualization of the flow field within a stirred tank
reactor equipped with a Rushton turbine," Chem. Eng. Res. Des., Vol.
75.
[8] NG, F., et al. (1998) "Assessment of sliding mesh CFD predictions and
LDA measurements of the flow in a tank stirred by a rushton impeller,"
Trans IChemE. Institution of Chemical Engineers, Vol. 76.
[9] Jianhua, F., Yundong, W. and Weingang, F. (2007) "Large Eddy
Simulation of flow instabilities in a stirred tank generated by a rushton
turbine," Chin. J. Chem Eng. Vol. 15.
[10] Zadghaffari, Ramin; Moghaddas, Jafarsadegh; and Revstedt, Johan
(2009) "Study of Flow Field, Power and Mixing Time in a Two-Phase
Stirred Vessel with Dual Rushton Impellers: Experimental Observation
and CFD Simulation," Chemical Product and Process Modeling: Vol. 4:
Iss. 1, Article 3.
[11] Kasat, Gopal R.; Pandit, Aniruddha B.; and Ranade, V. V. (2008) "CFD
Simulation of Gas-Liquid Flows in a Reactor Stirred by Dual Rushton
Turbines," International Journal of Chemical Reactor Engineering: Vol.
6: A60.
[12] Kumarsen, T. and Joshi, J.B. (2005) "Effect of impeller design on the
flow pattern and mixing in stirred tanks," Chemical Engineering Journal.
Elsevier.
[13] Ammar, M., et al (2009) « Etude comparative entre les différentes
géométries du mobile d'agitation ». 19ème Congrès Fran├ºais de
Mécanique. Marseille .
[1] Nagata, S. (1975) "Mixing: Principles and Applications". New York :
Halstead Press.
[2] Lane G.L, Schwarz M.P. and Evans G.M. Comparison of CFD method
for modeling of stirred tanks, Proc. 10th European Conference on
Mixing, Delft, the Netherlands, 2000, 197-204.
[3] Ljungqvist M., Rasmuson A. Numerical Simulation of the Two-Phase
Flow in an Axially Stirred Vessel," Trans IChemE, 2001, 79, Part A, pp.
533-546.
[4] Khopkar A., Aubin J., Rubio-Atoche C., Xuereb C., Le Sauze N.,
Bertrand J. and Ranade V.V. Flow Generated by Radial Flow Impellers:
PIV Measurements and CFD Simulations. International Journal of
Chemical Reactor Engineering, 2004, Vol. 2: A18
[5] Dhainaut, Marc; Tetlie, Pål; and Bech, Knut. Modeling and
Experimental Study of a Stirred Tank Reactor, International Journal of
Chemical Reactor Engineering, 2005, Vol. 3: A61.
[6] Ranade, V. V. (1997) "An efficient computational model for simulating
flow in stirred vessels: a case of Rushton turbine," Chemical Enginering
Science. Elsevier Science Ltd, Vol. 52, 24.
[7] Schafer, M., Hofken, M. and Durst, F. (1997) "Detailed LDV
measurements for visualization of the flow field within a stirred tank
reactor equipped with a Rushton turbine," Chem. Eng. Res. Des., Vol.
75.
[8] NG, F., et al. (1998) "Assessment of sliding mesh CFD predictions and
LDA measurements of the flow in a tank stirred by a rushton impeller,"
Trans IChemE. Institution of Chemical Engineers, Vol. 76.
[9] Jianhua, F., Yundong, W. and Weingang, F. (2007) "Large Eddy
Simulation of flow instabilities in a stirred tank generated by a rushton
turbine," Chin. J. Chem Eng. Vol. 15.
[10] Zadghaffari, Ramin; Moghaddas, Jafarsadegh; and Revstedt, Johan
(2009) "Study of Flow Field, Power and Mixing Time in a Two-Phase
Stirred Vessel with Dual Rushton Impellers: Experimental Observation
and CFD Simulation," Chemical Product and Process Modeling: Vol. 4:
Iss. 1, Article 3.
[11] Kasat, Gopal R.; Pandit, Aniruddha B.; and Ranade, V. V. (2008) "CFD
Simulation of Gas-Liquid Flows in a Reactor Stirred by Dual Rushton
Turbines," International Journal of Chemical Reactor Engineering: Vol.
6: A60.
[12] Kumarsen, T. and Joshi, J.B. (2005) "Effect of impeller design on the
flow pattern and mixing in stirred tanks," Chemical Engineering Journal.
Elsevier.
[13] Ammar, M., et al (2009) « Etude comparative entre les différentes
géométries du mobile d'agitation ». 19ème Congrès Fran├ºais de
Mécanique. Marseille .
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:58764", author = "Achouri Ryma and Hatem Dhaouadi and Hatem Mhiri and and Philippe Bournot", title = "CFD Study of Turbine Submergence Effects on Aeration of a Stirred Tank", abstract = "For many chemical and biological processes, the understanding of the mixing phenomenon and flow behavior in a stirred tank is of major importance. A three-dimensional numerical study was performed using the software Fluent, to study the flow field in a stirred tank with a Rushton turbine. In this work, we first studied the flow generated in the tank with a Rushton turbine. Then, we studied the effect of the variation of turbine’s submergence on the thermodynamic quantities defining the flow field. For that, four submergences were considered, while maintaining the same rotational speed (N =250rpm). This work intends to optimize the aeration performances of a Rushton turbine in a stirred tank.", keywords = "Aeration, CFD, Rushton turbine, mixing, submergence", volume = "7", number = "4", pages = "190-6", }
