The Simulation And Experimentation Study Of Internal Mixer' 3-D Flow Field And Temperature Field In Mixing Process

There are many mixing equipments being used in polymer processing. The internal mixer is one of the most popular intermittence batch mixing equipments. In order to improve the quality of compound, mixing efficiency, and making clearly about mixing mechanism and vary status of flow field and temperature field in chamber .People start to simulate it with FEM and related soft. This text did some simulations of 3-D fluid field and temperature field with ADINA.The 3-D FEM models of flow field and 3-D temperature field of synchronous four-wing rotor and mixing chamber had been built in the text. The article had made isothermal flow field simulation with different rotors type, the pressure field, velocity field and viscosity field had been obtained from numerical simulation. At the same time, rotors'stress and strain had been acquired by post-processing. Otherwise this text made simulation for 3-D rotor temperature field and 3-D mixer chamber temperature field. Mixing rubber's temperature transient value also had been gained from temperature field simulation. Temperature variable value of different part's temperature of mixer got too. The text provided a better way to find out every part's heat transfer capability.The simulation results indicate as follows:Through analysis about shear stress in the cross section of mixer flow field, there were three high shear regions, located at flight tip clearances, wedge region and nip clearance. Through studies on pressure and velocity vector distribution on cross section of the two rotors meshing area, concluded that four-wing rotors had better mixing ability and efficiency than two-wing rotors.From the particle tracing field, we knew that Rubber flowed trace just like number 8. Compared with the particle status of the two kind flow fields, we just consider flowing mixing without considering the rubber's strong elasticity and being cut. Generally speaking, we found that 0-90 degree phase rotors'mixing efficiency is better than 0-0 degree phase.Through four-wing synchronous rotor's temperature field simulation, we can see the patency effect by force cooling.Mixing rubber's temperature raised follow the time, it had increased just like linear in a periodic. Rubber's temperature rise lowly at early time, and rises quickly at middle period, then it rise fast at the end. Used nonlinear loaded power as input first, then we could have a closer simulation results to the experiment results.At last, a series of experiments were performed to testify the temperature field simulation results of the 3-D rotor mixer. It proved that the temperature field simulation with ADINA was feasible and credible. The flow field simulation results should have the improved equipment to discuss.