摘要
借助流体动力学软件Polyflow对单螺杆挤出机压缩段进行简化建模与模拟仿真,研究了稳态与动态加工成型条件对螺槽流道内速度场、压力场、剪切速率场、黏度场等物理场的影响。结果表明:振动强化成型时,各物理场随时间动态变化,熔体流动性能得到显著改善,有利于提高物料的塑化性能;振幅及频率较小时,各物理场变化与稳态成型时相差不大,而较大的振幅及频率对各物理场影响较大;振动强化延长了物料的停留时间增,强了横向剪切作用有,利于提高物料的分散混合性能。
The simplified model and numerical simulation on the compression section of single screw extruder were established by using fluid dynamics software Polyflow.The effects of processing parameters under steady and dynamic states on velocity field,pressure field,shear rate field and viscosity field were studied.The results show that during vibration enhancement,the physical fields change dynamically with the time,the flow ability of the melt is improved obviously,which is helpful to enhance the plasticization property of the material;when the values of amplitude and frequency are small,the values of the physical fields are similar with that under steady state,while the bigger frequency and amplitude have obvious effects on the physical fields;vibration enhancement prolongs the residence time of the material,improves the transversal shear effect,which is helpful to improve the dispersion and blending property of the material.
出处
《塑料科技》
CAS
北大核心
2011年第1期78-83,共6页
Plastics Science and Technology
基金
广东省自然科学基金资助项目(9151063101000021)
关键词
单螺杆挤出机
多物理场
数值模拟
振动强化
Single screw extruder
Multi-physical fields
Numerical simulation
Vibration enhancement
