摘要
介绍了差速双螺杆挤出机的特点,应用Polyflow软件对差速双螺杆挤出机端面进行了二维流场及混合模拟。并且将差速比4∶1、5∶1以及异向同速双螺杆的端面流场及混合效果进行了对比分析。模拟结果显示:差速双螺杆的切面混合效果好于同速双螺杆,且随差速比增大而略有改善;而差速比4∶1的剪切速率和拉伸速率大于5∶1的。由此可见,设计挤出机时要综合考虑混合和塑化两方面效果选择差速比。
Advantages of differential twin screw extruder were presented,in which cross-planar flow and mixing effect was further analyzed by Polyflow simulation. Comparison was conducted for the cases for differential ratios of 5：1 and 4：1 as well as 1：1 running in different directions. It was illustrated that differential extruder exhibited better in cross-section mixing index, which became stronger with higher differential ratio. However,shear rate and tensile rate for extrusion at differential ratio 4：1 were higher than for 5： 1. Thus,differential ratio should be chosen in considering mixing and plastication in design extruder.
出处
《塑料》
CAS
CSCD
北大核心
2013年第2期107-110,共4页
Plastics
基金
教育部新世纪人才计划
关键词
差速双螺杆挤出机
流动
混合
数值模拟
混合指数
differential twin screw extruder
flow
mixing
numerical simulation
mixing index
