Publicado 6 números por año
ISSN Imprimir: 1543-1649
ISSN En Línea: 1940-4352
Indexed in
Computational Study of Hydrodynamics of a Standard Stirred Tank Reactor and a Large-Scale Multi-Impeller Fermenter
SINOPSIS
We present single-phase simulations of the fully turbulent flow in a standard stirred tank reactor and a large-scale multi-impeller fermenter, both stirred by Rushton turbines. The mean flow characteristics and the turbulence predictions were obtained by solving the Reynolds-averaged Navier-Stokes (RANS) equations using the commercial computational fluid dynamics (CFD) code, Fluent 6.3. The standard, realisable and RNG k- models, and the Reynolds stress model (RSM) were employed for the modeling of turbulence. A moving reference frame (MRF) model was used for the modeling of the moving parts. Results showed that using the standard k - model, good predictions of the impeller power number can be calculated from the integrated turbulence kinetic energy dissipation rate as long as the grid resolution is sufficient. The underprediction in the power number was only 5% unlike the earlier studies, where values up to 50% were reported. The impeller flow number calculated was also in good agreement with the experimental values reported in the literature. The predictions of the turbulence kinetic energy and the turbulence energy dissipation profiles at the impeller discharge stream revealed that, despite its simple form, the standard k - model gave the best predictions, except in the close vicinity of the blade tip, where the RSM model matched better with the experimental data.
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