Abstract: In this study, the rotor structure of twin-rotor continuous mixer was designed with the PRO/Engineer software. The meshing and the setting of boundary conditions were made by the GAMBIT. The mixing processes with different rotors were simulated by POLYFOW, and the shear rate, the average velocity, the viscosity and the pressure in the axial direction were compared when the rotors rotate to different angle. Finally, it is found that the rotor whose meeting point of the screw flight at its 1/3 length position has obvious back pressure, which was beneficial to the counter flow of the mixing. This study is helpful to optimize the structure of the rotor and improve the mixing effect.

Key words: twin-rotor continuous mixer, shear rate, average velocity, viscosity, pressure