Investigation of the impeller angle effect on the performance of mixing tanks

In the present study, the effect of blade angle on two-phase flow (liquidsolid) distribution in a stirred tank with a pitched-blade turbine (PBT) was simulated using computational fluid dynamics (CFD). To simulate the solid-liquid two-phase flow, the standard k-ԑ turbulence model coupled with the Eulerian-Eulerian (E-E) Multi-Fluid Model was employed. The two-phase flow properties along the tank axis were computed and validated by the available data in the literature. Then, the effect of the blade angle on the fluid flow inside the tank as well as the solid phase volume fraction distribution were investigated. Results indicated that increasing the blade angle from 45 to 75 degrees at a constant speed, increased the maximum radial velocity and power consumption by 45.6% and 217%, respectively.