Numerical Simulation and Experimental Study on the Impact of Shear Strength on Mixing Dispersion in Synchronous Rotor Internal Mixer

Three dimensional shear flow field for synchronous rotor under different initial relative positions and conditions was established in mixing process of synchronous rotor internal mixer on the basis of rheological theory of rubber mixing rheological theory, as well the shear strength was analyzed by presenting a dispersive index. The simulation results show that the strong shearing sections are concentrated in the zone between the top of wing and mixing chamber wall and the zone between long wing and short wing. The dispersive index is increased with the shearing action, directly proportional to the rotate speed. The axial distribution law of shearing is foundationally the same under different initial relative positions, but the shearing strength is different for that. The experimental results are fit to the simulation results. The dispersion degrees of carbon black are different by ±1 level for two rotors placed in different initial relative positions.