Simulation and Experiment of the Motion Characters in Twin-Screw Extruder

In the paper, a velocity and fluid flow status of the melting process in twin-screw extruder were analyzed. To explore the optimum producing parameters of expanding food, several models of the flow field and velocity of twin-screw extruder were created with fake plastic Newton fluid. Then the velocity distribution rules in the cavity space were simulated. With the valuable verification of experiments, the results showed that, the velocity distribution near the inner wall is uniform, and increases at the delivery of the extruder. The velocity rises in the teeth root than in the top of the screws. At the mesh field, the velocity was changed frequently. The experiment of popped extrusion verified the simulation conclusion.