(366d) The Effect of Grid Cell Type in Mixing Time Simulations in Non-Turbulent Stirred Vessels

A new series of CFD simulations were carried out to study mixing times in stirred vessels operated in the laminar and transitional regimes. The focus of the simulations was on the effect of using various types (tetrahedral, hexahedral and polyhedral) and numbers of grid cells on accuracy and numerical diffusion. Results are presented with respect to flow fields and mixing times in vessels stirred by either a centrally positioned Rushton turbine or by three pitched blade turbines on a single axis. The simulations results for the Rushton will be assessed by means of the mixing time data reported by Hoogendoorn & Den Hartog (1964, 1967). In addition, in the simulations for the three pitched blade turbines, the single axis with the turbines was placed at different degrees of eccentricity to study its effect on mixing times.