Simulation of the Effect of the Paddle Agitator Height on the Hydrodynamic Behaviour in an Agitated Vessel

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The present investigation deals with the determination of the hydrodynamic behaviour induced by a paddle agitator and two-blade impeller in stirred vessel with different blade heights operating in laminar regime. Computational Fluid Dynamics (CFD) modelling of agitated system has been carried out using the code CFX. The velocity component calculation was carried out for paddle agitator in the bulk regions of the tank compare well with experimental observations and data. Many works confirmed that this type of geometry generates essentially, a tangential flow. The effects of the agitator height are examined, when this height decreases the paddle agitator becomes 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 velocity component calculation for this type of agitator confirmed that a maximum axial and radial velocity for the lowest height agitator.
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Laminar Mixing; 3D Modelling; Newtonian Fluid; Stirred Vessel

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