Abstract
The hydrodynamic and thermal behaviours induced by a six flat-bladed turbine, in a closed, unbaffled, batch stirred vessel are numerically predicted by means of Computational Fluid Dynamic (CFD) model. Heat transfer is applied on the jacketed wall of the stirred vessel. Solutions of the time-averaged Navier–Stokes and energy equations in conjunction with the standard k– ε turbulence model are developed using a control volume discretization method. A three-dimensional analysis of the hydrodynamic and thermal characteristics of the turbulent flow generated within the vessel are performed. Analyses concern the mean velocities and temperature fields, the turbulence kinetic energy and its production and dissipation rates. Turbulent flow characteristics are particularly examined between blades and in the impeller discharge stream. Also, the evolution in transient regime of the thermal state of the agitated vessel has been studied. Finally, Nusselt numbers numerically predicted are correlated by a dimensionless equation in order to be compared with ones found by other researchers.
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