Numerical simulation of the flow field of a stirred reactor

numerical simulation;  stirred reactor;  turbulence model;  Multiple reference frame method

The flow field characteristics of a stirred reactor were studied by numerical simulation, the K-ε two-equation turbulence model was used to analyze the flow field, and the multiple reference frame method was used to treat the stirring paddle area. The results show that the flow field formed by the improved arc blade has typical radial flow characteristics, and the axial flow is strengthened. Both the standard k-ε model and the RNG k-ε model can predict the maximum axial rate in the stirring tank more accurately, but the results obtained by the RNG k-ε model are more accurate. The turbulent energy in the stirring tank is mainly generated in the area around the blade and the near wall of the tank. However, the area below the blade is weakly affected by the circulating flow, and the K value is relatively small, so the blade should be closer to the bottom of the groove, or a folding blade with an inclination angle of 45° should be used, so as to strengthen the axial conveying capacity of the blade and improve the mixing effect.