场协同理论在聚合物加工中的应用

Application of Field Synergy Principle in Polymer Processing

对场协同强化传热理论在聚合物加工中的应用进行了探索性研究。采用数值计算方法分析了聚合物塑化系统中不同螺杆结构的流动与传热特性,对螺纹元件、Maddock 元件、销钉元件进行了传热分析,验证了场协同原理在聚合物非牛顿流体强化传热中的可行性。基于场协同理论,提出了一种新型螺杆结构——扭转元件,并对 2 种扭转元件构型进行了场协同强化传热分析。结果表明,场协同原理可以很好地解释高黏度非牛顿流体的强化传热现象,以此为理论基础设计的新型扭转结构能够较好地改善速度场与温度梯度场的协同性,提高对流换热系数,强化对流换热性能。

The application of field synergy principle in polymer processing was explored. 3D numerical simulations were performed for heat transfer and fluid flow characteristics of various screw configurations in the plasticizing unit of polymer. Heat transfer analysis of screw element,maddock element and pin element were carried out. The new screw element with twisted groove,called torsion element,was proposed based on the field synergy principle for the first time. The results showed that the field synergy principle could well explain the heat transfer enhancement of the high viscosity non-Newtonian fluid. The new torsional structure based on this theory could improve the synergy between velocity field and temperature gradient field, improve the convective heat transfer coefficient and enhance the convective heat transfer performance.