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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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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


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