化工进展2017，Vol.36Issue(4)：1217-1223,7.DOI:10.16085/j.issn.1000-6613.2017.04.009
微型锥形双螺杆挤出机的循环混合特性
Mixing performance in a miniature conical twin screw extruder with batch filling
摘要
Abstract
The circulatory mixing in a miniature conical twin screw extruder(MCTSE)under the condition of batch filling was evaluated numerically using finite element modeling. The simulation was implemented with mesh superposition technique to generate velocity profiles and particle trajectories for the extrusion process of polymer melt. Based on the statistical analysis of tracking particles,the dispersive mixing was evaluated using shear stress and mixing index,and the distributive mixing was assessed using the length of stretch and the scale of separation. The mixing performance in different screw pitch and rotating speed were also examined. The results showed that the mixing of MCTSE was dependent on stretching flow cooperation with shear flow. Both the dispersive mixing and distributive mixing were improved by either increasing the rotating speed of screw or decreasing the screw pitch, yet an opposite tendency was displaying for the mixing efficiency. The preference was given to the proper process rather than the screw structure of MCTSE on the basis of the composite analysis of different mixing parameters.关键词
微型锥形双螺杆挤出机/数值模拟/层流/分散/混合Key words
miniature conical twin screw extruder/numerical simulation/laminar flow/dispersion/mixing分类
化学化工引用本文复制引用
陈世昌,张先明,徐俊杰,陈文兴,冯连芳..微型锥形双螺杆挤出机的循环混合特性[J].化工进展,2017,36(4):1217-1223,7.基金项目
国家重点研发计划项目(2016YFB0303002). （2016YFB0303002）
