Flow Visualisation in Co-rotating Twin Screw Extruders: Positron Emission Particle Tracking and Numerical Particle Trajectories
Flow Visualisation in Co-rotating Twin Screw Extruders: Positron Emission Particle Tracking and Numerical Particle Trajectories
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DOI：
10.3139/217.2475
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发表时间：
2011-11-01
影响因子：
1.3
通讯作者：
Anderson, P. D.
中科院分区：
文献类型：
--
作者：
Diemer, J.;Chilles, C.;Anderson, P. D.
同向双螺杆挤出机是广泛使用的混炼机。它们主要基于丰富的经验和迭代方法进行配置，以优化输出和复合质量。欧盟 PEPTFlow 项目开发的可视化技术可以通过使用专门开发的摄像系统跟踪聚合物熔体中的放射性示踪剂颗粒，在实际加工条件下实现双螺杆挤出机中复合材料流动的可视化。这种新方法允许在正常温度和熔体压力下的实际混炼条件下研究不同螺杆元件和螺杆配置中的聚合物流动。本文介绍了相机系统的最新发展以及使用和解释结果的不同方法。对标准复合螺杆元件（如捏合盘、输送元件和反向元件）的停留时间和停留时间分布进行了详细分析。此外，为了更好地了解双螺杆挤出机内部的流场，还进行了数值颗粒跟踪。使用 XFEM 方法求解斯托克斯方程，并比较各种螺杆设计的数值 RTD（停留时间分布）。
Co-rotating twin-screw extruders are widely used compounding machines. They are mainly configured based on extensive experience and iterative approaches to optimise output and composite quality. The visualisation technology developed in the EU-project PEPTFlow allows visualisation of composite flow in twin-screw extruders under realistic processing conditions by tracking radioactive tracer particles in the polymer melt, using a specially developed camera system. This new approach allows polymer,flow to be studied in different screw elements and screw configurations under realistic compounding conditions at normal temperatures and melt pressures. The paper presents the latest developments in the camera systems as well as the different ways to use and interpret the results. Detailed analysis of residence times and residence time distributions for standard compound screw elements, like kneading discs, conveying elements and reverse elements are presented. In addition for a better understanding of the flow field inside twin-screw extruders, numerical particle tracking is done. The Stokes equation, using XFEM method, are solved and the numerical RTD's (residence time distribution) are compared for various screw designs.