销钉机筒挤出机混合段的混合性能  

Mixing Performance of the Mixing Section in a Pin Barrel Extruder

作　　者：陈晋南[1] 姚慧[1] 彭炯[1] 

机构地区：[1]北京理工大学化工与环境学院,北京100081

出　　处：《北京理工大学学报》2008年第1期90-94,共5页Transactions of Beijing Institute of Technology

摘　　要：使用有限元法数值模拟有销钉和无销钉混合段流道内胶料的三维等温流场,用粒子示踪分析方法比较两者的混合性能.研究结果表明,有销钉混合段流道内,销钉局部打乱了胶料的运动轨迹,打散了滞留熔体,6个销钉所在横截面的流场被分成6个区域.料流被迫改变方向重新排列;胶料熔体的速度梯度增加;随着胶料速度梯度的增大,胶料的剪切应力增大,混合指数分布均匀.有销钉混合段的11个截面平均分离尺度小于无销钉混合段的10%.机筒销钉对于分散混合有一定的强化作用,其混合程度高于无销钉结构.3-D isothermal flow fields of rubber melts in the pin and pinless mixing sections were simulated by FEM. Mixing performance of the two models is compared by particle tracking analysis. Simulation results indicate that the path lines of the melts in the pin mixing section are disturbed locally. The stagnant melts are broken up. The flow fields are divided into six zones by the six pins. The direction of melt flow is changed. The velocity gradients of melt increase. The shear stress increases with the increment of velocity gradient. The distribution of the mixing index is even. Average segregation scale of the eleven slices on the model with pins is 10 % lower than that of the pinless case. Barrel pins strengthened the dispersive mixing. The mixing performance of the pin extruder is better than that of the pinless case.

关 键 词：数值模拟 销钉机筒挤出机 混合 粒子示踪分析 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]