不同螺杆构型的聚合物塑化过程混合特性分析  

Comparison of Polymer Mixing Properties Processed by Different Kinds of Screw Configurations

作　　者：鉴冉冉 谢鹏程[1] 丁玉梅[1] 杨卫民[1] JIAN Ranran;XIE Pengcheng;DING Yumei;YANG Weimin(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学,机电工程学院,北京100029

出　　处：《塑料》2018年第6期1-4,共4页Plastics

基　　金：国家自然科学基金(51576012).

摘　　要：螺杆混合性能是影响聚合物塑化质量和均匀性的重要因素之一。采用扭转元件、销钉元件、Maddock元件及常规螺纹元件,应用计算流体力学软件Polyflow对5种螺杆构型的混合特性进行了数值仿真分析,结合停留时间分布、剪切速率分布、拉伸速率分布、混合指数和非弹性应力张量的第一特征值等参数比较全面地对其混合能力进行了比较。结果表明,5种螺杆构型流道内物料均以剪切流动为主,Maddock元件的剪切作用最明显,具有分流功能的结构可以在一定程度上强化对物料的拉伸作用;2种扭转元件对于物料的混合效果相对较好,其次是销钉元件和Maddock元件,最差的是常规螺纹元件。The mixing performance of screw was one of the important factors that affected the quality and uniformity of polymer plasticizing.Polymer mixing properties processed by five kinds of screw configurations,namely torsion element,pin element,maddock element and screw element,were simulated and compared through using Polyflow as polymer fluid dynamic software.The mixing ability was compared comprehensively based on residence time distribution,shear rate distribution, stretching rate distribution,mixing index and the first eigenvalue of the extra-stress tensor T.The results showed that material in the runner of five kinds of screw configurations suffered shear action mainly,and maddock element was of the largest shear action in the runner.The structure with distributary function could strengthen the tensile effect on the material to a certain extent.The mixing effect of two kinds of torsion elements was relatively good,the next was pin element and maddock element, the worst was the conventional screw element.

关 键 词：混合性能 停留时间 剪切速率 拉伸速率 混合效率 混合指数 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]