新型偏心啮合盘元件的混沌混合特性  

Chaotic Mixing Characteristics of New Eccentric Kneading Disc Element

作　　者：沈美震 任建民[1] 朱向哲[1] 李万旭 Shen Meizhen;Ren Jianmin;Zhu Xiangzhe;Li Wanxu(School of Mechanical Engineering,Liaoning Shihua University,Fushun 113001,China;The Eighth Construction Company of CNPC,Ltd.,Fushun 113006,China)

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001 [2]中国石油天然气第八建设有限公司,辽宁抚顺113006

出　　处：《工程塑料应用》2020年第3期83-91,共9页Engineering Plastics Application

基　　金：国家自然科学基金项目(51973085,51473073)

摘　　要：在双螺杆挤出机中引入偏心圆啮合盘元件,分析了新型啮合盘元件偏心圆啮合盘元件的压力场、速度矢量场、剪切速率场和混合指数场。同时比较了其在不同错列角和偏心距下的对数拉伸率、最大剪切速率、停留时间分布、分布指数和分离尺度。结果表明,偏心圆啮合盘元件轴向和周向压力梯度较大,两转子棱峰之间区域流动性较好。偏心圆啮合盘元件的轴向间隙和螺棱顶隙为其提供了良好的剪切能力。偏心搅拌提供了较强的拉伸作用,增强了其拉伸折叠效果,从而使其具有较好的混沌混合能力。对比不同的几何参数发现错列角为60°和偏心距为5 mm的啮合盘元件拥有较好的分散混合性能和分布混合性能。通过粒子可视化及其混合特性曲线分析,为深入了解偏心搅拌提供了理论依据。The eccentric-disc kneading elements was introduced into the twin-screw extruder,the pressure field,velocity vector field,shear rate field and mixing index field were analyzed by ANSYS finite element software.At the same time,the logarithmic of stretch,maximum shear rate,residence time,distribution index and separation scale were compared under different stagger angles and eccentricities.The results show that the axial pressure gradient of the eccentric-disc kneading elements is larger,and the fluidity between the screw arris peaks of the two rotors is better.The axial clearance and the top clearance of thescrew arris provide a good shear capability for eccentric-disc kneading elements.Eccentric stirring provides strong stretching effect,enhances its stretching and folding effect,and thus makes it has better chaotic mixing ability.By comparing different geometric parameters,it is found that the eccentric-disc kneading elements with staggered angle of 60°and eccentricity of 5 mm has better dispersion and distribution mixing performance.The visualization of particles and the analysis of mixing characteristic curves provide theoretical basis for further understanding of eccentric agitation.

关 键 词：偏心圆啮合盘元件 双螺杆挤出机 混沌混合 数值模拟 

分 类 号：TQ320.5[化学工程—合成树脂塑料工业]