Numerical simulation of solid-liquid suspension characteristics induced by three-bent-bladed turbine in stirred tank

The software of CFD FLUENT was used to simulate the strengthening characteristics of three-bent-bladed turbine in solid-liquid suspension system. Diameter of stirred tank is T = 100mm. Four baffles are evenly distributed in the tank and two-phase material selection of glass ball-water system. Particle diameter is 250μm and solid volume fraction is 15%. The standard dual equation model is adopted in the liquid turbulence model. The Euler multiphase flow model is applied to simulate the suspension process. The strengthening effect of the impeller's upturned angle is discussed on solid suspension, and the radial velocity and solid volume concentration distribution of solid particles are analyzed, respectively. The results showed that, compared with 30 degrees of upturned angle of three-bent-bladed turbine(30°UA-3BT), the axial velocity of solid particles did not increase significantly with 20 degrees of upturned angle of three-bent-bladed turbine(20°UA-3BT) in the stirred tank. But distribution of solid volume concentration was more uniform, which reduced the accumulation of solid particles at the bottom of tank and the clean area of the top of stirred tank. 20°UA-3BT is beneficial to the full mixing of solid and liquid. Therefore, the turbine has a good application prospect. (paper)