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首页> 外文期刊>Journal of food engineering >Flow Fields in Straight and Tapered Screw Extruders Using Magnetic Resonance Imaging
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Flow Fields in Straight and Tapered Screw Extruders Using Magnetic Resonance Imaging

机译：直线和锥形螺杆挤出机的磁共振成像流场

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摘要

Improving the fundamental knowledge of fluid transport in extrusion is essential for the improved control and design of extruder systems. In particular, velocity profiles give valuable insight into residence time distributions and shear history which control final product characteristics. Due to the complicated geometry of extruders, mathematical models to predict flow behavior have been based on simplifying assumptions. Experimental verification of theory has proved to be a challenge due to the difficulty in obtaining complete flow profiles. This paper demonstrates the use of MRI to study flow in extruder geometries. Images of the velocity profile in both a straight screw and a tapered screw extruder have been generated using this non-invasive technique. Good agreement exists between experimental and theoretical velocity profiles for open and closed discharge for both straight and tapered screws.
机译：改善挤出中流体传输的基本知识对于改进挤出机系统的控制和设计至关重要。特别是，速度分布图可提供对控制最终产品特性的停留时间分布和剪切历史的有价值的见解。由于挤出机的几何形状复杂，因此预测流动行为的数学模型已基于简化的假设。由于难以获得完整的流量剖面，理论上的实验验证已被证明是一个挑战。本文演示了使用MRI研究挤出机几何形状中的流动。使用这种非侵入性技术已经在直螺杆和锥形螺杆挤出机中产生了速度分布图。直线和锥形螺杆的打开和关闭排放的实验和理论速度曲线之间存在良好的一致性。

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