Abstract：The particle suspension performance of high concentration solution in eccentric stirred tank was numerically investigated for an unbaffled flatbottom cylindrical vessel with diameter of 0.34 m.Flow pattern variation, particle volume fraction distribution, justsuspended speed and power consumption were analyzed for two different axial flow impellers, a 45°pitched blade turbine(PBT) impeller and a ZHX propeller at different eccentricities and rotational speeds. The numerical results were compared with experimental data.The results show that eccentric agitation can break up the flow field symmetry of coaxial agitation to enhance the axial flow velocity with particle suspension performance of eccentric impeller better than that of center agitation. The effect of solid suspension depends on eccentricity with optimum eccentricity of 0.4. Eccentric agitation can increase justsuspended speed and power consumption, which is not good for energy saving and consumption reducing.
2012, Vol. 33 
