Abstract：The mixing time is an important index to evaluate the mixing efficiency of the mixing equipment. In order to detect the mixing time of the liquid-solid-solid three-phase flow field in the stirred tank equipped with baffles and draft tube, a flow field system using the glycerol solution as the liquid phase, the sand and red mud as solid phases was established and the mixing time of the system was measured by electrical conductivity method. The computational fluid dynamics (CFD) simulation of the flow field was carried out. The CFD model was based on the Eulerian multiphase model and the RNG k-ε turbulence model. The simulation results indicated that the CFD model could well predict the mixing time of the flow field due to smaller deviation of between the simulation and experimental results. The mixing time decreased with the increase of the stirring speed, and when the axial mixing of the flow field was dominant, the mixing time of the flow field can be reduced by adding the draft tube. The draft tube had a great influence on the solids with smaller particle size and density.
Qin Shuai,Wang Licheng,Shen Shizhong et al. Measurement and Simulation of Mixing Time of Three-Phase Flow Field in the Stirred Tank[J]. 化学反应工程与工艺, 2017, 33(1): 65-72.
