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Research Article
 

CFD Simulations of the 3D Velocity Profile of Paddle Agitator and Two-blade Impeller in Stirred Vessel with a Highly Viscous Newtonian Fluid



M. Bouzit , L. Benali , M. Hachemi and F. Bouzit
 
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ABSTRACT

Computational Fluid Dynamics is used to solve 3D hydrodynamics of a mixing vessel for paddle agitators and two-blade impellers with different blade heights operating in laminar regime. These results are compared with available experimental data: good agreement is observed. The tangential velocities calculation was carried out for paddle agitator with height W =1.5T. Early studies confirmed that this type of geometry generates essentially a tangential flow. The results obtained show good agreement with those obtained by many authors. The second agitator height was W = 0.25T which behaves, generally, like a turbine and generates more important axial and radial velocities which are at the origin of secondary flows on both sides of the blade. The axial velocities calculation for blades of various heights confirmed the observations of many authors; especially, a maximum velocity for the lowest height considered. The position of the impeller in the tank was analysed and the axial velocity change with the positions of the impeller.

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  How to cite this article:

M. Bouzit , L. Benali , M. Hachemi and F. Bouzit , 2006. CFD Simulations of the 3D Velocity Profile of Paddle Agitator and Two-blade Impeller in Stirred Vessel with a Highly Viscous Newtonian Fluid. Journal of Applied Sciences, 6: 2733-2740.

DOI: 10.3923/jas.2006.2733.2740

URL: https://scialert.net/abstract/?doi=jas.2006.2733.2740

REFERENCES
1:  Abid, M., C. Xuereb and J. Bertrand, 1994. Modeling of the 3-D hydrodynamics of 2-Blade impellers in stirred tanks filled with a highly viscous fluid. Can. J. Chem. Eng., 75: 184-193.
CrossRef  |  

2:  Anne-Archard, D. and H.C. Boisson, 1995. A finite element simulation of the crossed-effects of viscoelasticity and inertia in an agitated vessel. Int. Num. Meth. Fluids, 21: 75-90.
Direct Link  |  

3:  Bertrand, J. and J.P. Couderc, 1982. Agitation de fluides pseudoplastiques par un agitateur bipale. Can. J. Chem. Eng., 60: 738-747.
CrossRef  |  

4:  Bertrand, J., 1983. Agitation de fluides visqueux: Cas de mobiles a pales, d'ancres et de barrieres. Ph.D. Thesis, INP Toulouse, France.

5:  Hiraoka, S. and I. Yamada, 1978. Numerical analysis of flow behaviour of highly viscous fluid in agitated vessel. J. Chem. Eng. Jap., 11: 487-493.

6:  Kuncewicz, C. and M. Pietrzykowski, 2001. Hydrodynamic model of a mixing vessel with pitched-blade turbines. Chem. Eng. Sci., 56: 4659-4672.
CrossRef  |  

7:  Tatterson, G.B., 1991. Fluid Mixing and Gas Dispersion in Agitated Tanks. McGraw-Hill, New York.

8:  Ulbrecht, J.J. and P.J. Carreau, 1985. Mixing of Viscous Non-newtonian Liquids. In: Mixing of Liquids by Mechanical Agitation, Ulbrecht, J.J. and G.K. Patterson (Eds.). Gordon and Beach, New York.

9:  Youcefi, A., D. Anne-Archard, H.C. Boisson and M. Sengelin, 1997. On the influence of liquid elasticity on mixing in a vessel by a two-bladed impeller. J. Fluids Eng., 119: 616-622.
Direct Link  |  

10:  Yu, C. and S. Gunasekaran, 2005. Performance evaluation of different model mixers by numerical simulation. J. Food Eng., 71: 295-303.
Direct Link  |  

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