间断副螺棱强化单螺杆挤出过程混合性能模拟  

Simulation of Enhancement of Mixing Performance in Single-Screw Extruder by Intermittent Baffle

作　　者：李彬[1] 徐百平[1,2] 杜遥雪[1] 

机构地区：[1]五邑大学机电工程学院,广东江门529020 [2]广东轻工职业技术学院广东高校高分子材料加工工程技术开发中心,广东广州510300

出　　处：《现代塑料加工应用》2014年第3期52-55,共4页Modern Plastics Processing and Applications

基　　金：国家自然科学基金(11272093);广东省部产学研项目(2012B091100432);广东省自然科学基金(S2011010000411)资助

摘　　要：建立了带有间断副螺棱的新型单螺杆计量段螺槽展开物理模型及数学模型。借助流体动力学软件Ployflow,采用网格叠加技术,对熔体在新型单螺杆及普通单螺杆挤出机计量段展开螺槽内的流动情况分别进行了数值模拟。运用粒子示踪技术及统计学方法以停留时间分布、分离尺度及累计混合指数为指标来表征螺杆的混合性能。结果表明,相比于普通单螺杆,新型单螺杆不仅可以减小熔体物料分离尺度,提高混合指数,还可以加宽停留时间分布概率密度曲线,获得更好的混合分散效果。The physical and mathematical models of unwound screw channel of mehing zone in new type of single-screw extruder, which inserted a intermittent baffle into the screw channel,were proposed. With the help of the mesh superposition technique provided by fluid dynamics software Polyflow. the flow performances of polymer meh in such a new type of extruder and traditional single-screw extruder were numerically simulated. Adopting the particle tracking technique and statistical methods, the mixing performances were investigated and characterized in terms of different parameters such as residence time distribution, segregation scale, mixing efficiency and mixing index. The resuhs show that compared with traditional single-screw, the novel geometry not only decreases material particle segregation scale variation stable, but also broaden the RTI） much wider along with higher mixing index, which is helpful to improve the dispersion and blending property of the material.

关 键 词：单螺杆挤出机 混合 停留时间分布 分离尺度 混合指数 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]