Abstract
The effect of the tank design on the hydrodynamic structure is carried out in three tanks; cylindrical tank, curved tank and spherical tank; equipped with a six-pitched blade turbine (PBT6). The hydrodynamic behaviour is numeri- cally predicted by the resolution of the Navier-Stokes equations in conjunction with the Renormalization Group (RNG) of the k-e turbulence model. These equations are solved by a control volume discretization method. The numerical results from the application of the CFD code Fluent with the Multi Reference Frame (MRF) model are presented in the impeller stream region. Particularly, the velocity components and the turbulent characteristics are presented in different planes con- taining the blade. The power consumption of these stirred tanks was calculated to choose the most effective system. The comparison between the numerical results and the experimental data showed a good agreement.
Highlights
Stirred tanks have wide applications in different industrial process
Armenante et al.[8] studied the hydrodynamic structure of the turbulent flow generated with a six pitched blades turbine (PBT6) is investigated for two International Journal of Mechanics and Applications. 2012; 2(1): 12-19 axial velocity and the turbulent kinetic energy have been compared with the measured LDV data
A typical simulation is considered converged when the residual mass and other quantities characterizing the flow as the three velocity components and turbulent kinetic energy and the dissipation rate fall below 10-6 [24]
Summary
Stirred tanks have wide applications in different industrial process. In the various applications, stirred tanks are required to fulfill several needs like blending of miscible liquids, dispersion of gases or immiscible liquids into a liquid phase, suspension of solid particles, heat and mass transfer promotion and chemical reactions. Armenante et al.[8] studied the hydrodynamic structure of the turbulent flow generated with a six pitched blades turbine (PBT6) is investigated for two. The CFD code "Fluent" is used for numerical simulation of hydrodynamic structure of turbulent flows in a stirred tank. This code is based on solving Navier-Stokes equations with a finite volume discretization method described in detail by Patankar[15]. The Multi Reference Frame (MRF) approach is available to incorporate the motion of the impeller in the stirred tank. A steady transfer of information is made at the MRF interface as the solution progresses
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