啮合同向双螺杆驼峰元件的数值模拟

介绍了啮合同向双螺杆驼峰元件的特点,应用Polyflow软件进行了流场模拟,并与双头螺纹元件进行了比较分析。模拟结果显示:驼峰元件的螺棱和机筒之间的剪切速率比双头螺纹的低;建压能力比双头螺纹元件高;回流量较大,轴向混合能力较强。特别适用于生物降解塑料等热敏性和剪敏性塑料的高速挤出和混合。

Numerical Simulation of the Camel Back Element in Intermeshing Co-rotating Twin Screw Extruder

The characteristic of twin screw camel back element was introduced,the flow field was simulated by Polyflow software and compared with double flights screw element.The results of simulation indicated that:the shear rate between screw flight and barrel of camel back element was lower than double flights screw element,the pressure-built ability of camel back element was higher than double flights screw element,and the back flow value of camel back element was more than double flights screw element and the axial distribution-mixing ability is better.The camel back element was suit for the high-speed extruding and compounding of biodegradable plastics,such as heat-sensitive and shear-sensitive plastics.