聚合物固体粒子在熔体中的流动和传热数值分析

Numerical Analysis of Flow and Heat Transfer of a Polymer Solid Pellet in Melt

对螺杆挤出机螺槽建立了准三维的流动和传热模型,模拟了聚合物固体粒子在熔体中的流动、受热、温升和熔融行为;采用横纵向截面研究了聚合物固体粒子的速度和温度随时间的变化情况;通过计算得出了固体粒子熔融所需要的时间以及流场总能量增量中外部传热和内部黏性耗散生热所占的百分比。结果表明,机筒传热和黏性耗散对系统能量增加的贡献为3.68∶1。

A quasi-3-dimension flow and heat transfer model for extruder screw channel was established to investigate the flow, heating, and melting behavior of solid particles in a polymer melt. Sections along longitudinal and latitudinal directions were selected to study the velocity and temperature of solid pellet as functions of time. The time required for the solid particles to melt and the internal energy increase were calculated accurately. It was found that the ratio of transferred heat and internal energy was 3.68 ： 1.