Commenced in January 2007
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Computational Fluid Dynamics Simulation of Gas-Liquid Phase Stirred Tank

Authors: Thiyam Tamphasana Devi, Bimlesh Kumar

Abstract:

A Computational Fluid Dynamics (CFD) technique has been applied to simulate the gas-liquid phase in double stirred tank of Rushton impeller. Eulerian-Eulerian model was adopted to simulate the multiphase with standard correlation of Schiller and Naumann for drag co-efficient. The turbulence was modeled by using standard k-ε turbulence model. The present CFD model predicts flow pattern, local gas hold-up, and local specific area. It also predicts local kLa (mass transfer rate) for single impeller. The predicted results were compared with experimental and CFD results of published literature. The predicted results are slightly over predicted with the experimental results; however, it is in reasonable agreement with other simulated results of published literature.

Keywords: Eulerian-Eulerian, gas-hold up, gas-liquid phase, local mass transfer rate, local specific area, Rushton Impeller.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1129003

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References:


[1] Bakker and H.E.A. Van den Akker. “A computational model for the gas-liquid flow in stirred reactors,” Chem. Eng. Res. Des,. Vol. 72, pp. 594-606, 1994.
[2] L. Lane, M. P. Schwarz, and G. M. Evans. “Predicting gas-liquid flow in a mechanically stirred tank,” Appl. Math. Model., vol. 2, pp. 223-235. 2002.
[3] L. Lane, M .P. Schwarz, and G. M. Evans. “Numerical modelling of gas-liquid flow in stirred tanks,” Chem. Eng. Sci., vol. 60, pp. 2203-2214, 2005.
[4] S. S. Alves, C. I. Mania and J. M. T. Vasconcelos. “Experimental and modeling of gas dispersion in double turbine stirred tank”, Chem. Eng. Sci., vol. 89, pp 109-117, 2002a.
[5] N. G. Deen, T. Solberg and B. H. Hjertager. “Flow generated by an aerated Rushton impeller: two phase PIV experiments and numerical simulations,” Canadian J. Chem. Eng., Vol. 80, pp. 638-652, 2002.
[6] A. R. Khopkar and V. V. Ranade. “CFD simulation of gas-liquid vessel: VC, S33 and L33 flow regimes,” AIChEJ, vol. 52(5), pp. 1654-1672, 2006.
[7] G. Montante, A. Paglianti, and F. Magelli. “Experiments and simulations of gas-liquid stirred vessels,” in Proc. of 12th Eurepian Conf. on Mixing, Bologna, 2006, pp. 137-144.
[8] P. Ranganathan. and S. Sivaraman. “Investigations on hydrodynamics and mass transfer in gas-liquid stirred reactor using computational fluid dynamics,” Chem. Eng. Sci., vol. 66, pp. 3108-3124, 2011.
[9] G. L. Lane, M.. P. Schwarz, and G. M. Evans. “Numerical modelling of gas-liquid flow in stirred tanks,” Chem. Eng. Sci., vol. 60, pp. 2203-2214, 2004.
[10] J. C. Scargiali, F. D’Orazio, F. Grisafi, and A. Brucato. “Modelling and simulation of gas-liquid hydrodynamics in mechanically stirred tanks,” Chem. Eng. Res. Des., vol. 85, pp. 637-646, 2007.
[11] G. Montante, A. Paglianti and F. Magelli. “Experimental analysis and computational modelling of gas-liquid stirred vessels,” Chem. Eng. Res. Des., vol. 85(A5), pp. 647-653, 2007.
[12] V. V. Ranade. “Computational flow modelling for chemical reactor engineering,” Academic press, New York, 2002.
[13] S. E. Elgobashi, and M. A. Rizk. “A two-equation turbulence model for dispersed dilute confined two-phase flows,” Inter. J. Multiphase Flow, vol. 15(1), pp. 119-133, 1999.
[14] Fluent 6.2 & 6.3 User’s Guide, 2005 & 2006.
[15] A. R. Khopkar, A. R. Ramamohan, V. V. Ranade, and M. P. Dudukovic. “Gas-liquid flow generated by a Rushton turbine in stirred vessel: CART/CT measurements and CFD simulations,” Chem. Eng. Sci., vol. 60, pp. 2215-2229, 2005.
[16] M. Ishii, N. Zuber. Drag coefficient and relative velocity in bubbly, droplet or particulate flows,” AIChE J., vol. 25, pp. 843-855, 1979.
[17] F. Kerdouss, A. Bannari, and P. Proulx. “CFD modeling of gas dispersion and bubble size in a double turbine stirred tank,” Chem. Eng. Sci., vol. 61, pp. 3313-3322, 2006.
[18] P. V. Danckwerts. “Significance of liquid-film coefficients in gas absorption,” Ind. Eng. Chem., vol. 43, pp. 1460-1467, 1951.
[19] J. C. Lamont and D. S. Scott. “An eddy cell model of mass transfer into the surface of a turbulent liquid,” AIChE J., vol. 16, pp. 513-519, 1970.
[20] Kolmogorov, A.N. The local structure of turbulence in incompressible viscous fluid for very large Reynolds numbers, Doklady Akademii Nauk SSSR, Vo. 30, pp. 301-305, 1941.
[21] W. J. McManamey and D. A. Wase. “Relationship between volumetric mass transfer coefficient and gas hold up in airlift fermenters,” Biotechnol. Bioengg, vol. 28, pp. 1446-1448, 1986.
[22] K. J. Myers, A. J. Thomas, A. Bakker, and M. F. Reeder. “Performance of gas dispersion impeller with vertically asymmetric blades,” Chem. Eng. Res. Des., vol. 77, pp. 728-730, 1999.
[23] J. Gimbun, C. D. Rielly, and Z. K. Nagy. “Modelling of mass transfer in gas-liquid stirred tanks agitated by Rushton turbine and CD-6 impeller: A scale-up study,” Chem. Eng. Res. Des. Vol. 87, pp. 437-451, 2009.