Abstract:

With the CFD software POLYFLOW,this paper built simplified models for a single screw pin unit and a single screw unit based on electromagnetic dynamic plasticizing theory,carried out numerical simulation on them,and finally analysed comparatively the mixing behavior of these two mixing units with and without vibration force field.It is found that the pin unit has longer residence time,smaller segregation scale and higher instantaneous efficiency of stretching than the single screw mixing unit does;by the action of vibration field,the pin mixing element possesses better diffluence and rearrangement,flow state,fluidity andplasticization performance for the polymer melt particles.Meanwhile,experimental study proves the fact that vibration field can reduce the particle size of polymer melt.The results are of great importance for designing new type mixing devices based on electromagnetic dynamic plasticizing theory.

Key words: segregation scale, instantaneous efficiency, residence time distribution, vibration force field

摘要：

借助于计算流体动力学软件POLYFLOW,基于电磁动态塑化理论建立了销钉混炼元件和单螺杆混炼元件的简化几何模型,并对其进行数值模拟仿真,对比分析两种混炼元件在稳态与动态加工成形条件下的混炼性能。结果表明：销钉混炼元件比单螺杆混炼元件累计停留时间长、分离尺度小、瞬时混合效率高,引入振动场可以强化其熔体颗粒分流和重排,改善熔体流动状态,提高其流道物料混炼性能;同时,用实验验证了引入振动力场有利于减小物料粒子粒径。研究结果为电磁动态塑化理论应用于混炼设备的设计研发提供了参考和借鉴。
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关键词: 分离尺度, 瞬时混合效率, 停留时间分布, 振动力场