关键词: Polyflow, 滑移 , 数值模拟 , 混合效率 , 中心区 , 网格重叠技术

Abstract: Mixing performance in an intermeshing co-rotating triangle arrayed tri-screw extruder in the cross-section was investigated under different slip coefficients using computational fluid mechanics software packaged Polyflow. The relationship between the shear stress at the screw surface and the slip velocity of the flowing melt obeys Naviers linear law. The mixing index in the central region and screw region were studied under different slip coefficients by comparison, as well as the mixing index at the mid-point with probe technology. Mixing simulation was conducted based on the flow field. The scale of segregation, logarithm of the length stretch, instantaneous and time averaged efficiencies were studied using the statistics module Polystat. The results show that the proper smooth wall of the screw is of benefit to improving mixing performance. 

Key words: Polyflow, Wall slip, Numerical simulation, Mixing efficiency, Central region, MST