• CN:11-2187/TH
  • ISSN:0577-6686

›› 2009, Vol. 45 ›› Issue (4): 46-49.

• 论文 • 上一篇    下一篇

高聚合物在双螺杆挤出机中预热融化过程的数值模拟

张宇昕;卢涛;江波;王奎升;罗兵   

  1. 北京化工大学机电工程学院
  • 发布日期:2009-04-15

Numerical Simulation of Polymer Melting during Preheating in Twin-screw Extruder

ZHANG Yuxin;LU Tao;JIANG Bo;WANG Kuisheng;LUO Bing   

  1. School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology
  • Published:2009-04-15

摘要: 建立双螺杆挤出机预热起动时包括机筒、高聚合物和螺杆在内的非稳态传热模型,用于预测挤出机的温度变化和分布,以及螺槽中的高聚合物融化情况。数值结果表明,受加热通道分布的影响,总体上机筒中部的温度和靠近加热通道的高聚合物温度较高,高聚合物融化越快。“8”字孔内表面、高聚合物和螺杆的平均温度随预热时间的增加而升高,“8”字孔内表面的温度在预热初期上升最快,在预热末期最先达到稳态,而螺杆的温度变化趋势与“8”字孔内表面温度变化趋势相反。与温度变化相协同,高聚合物在机筒内的融化速率随预热时间逐渐减小。研究结果对机筒加热通道的设计和优化,以及准确预测安全预热时间具有指导意义。

关键词: 高聚合物, 挤出机, 融化, 数值模拟, 双螺杆

Abstract: An unsteady model of heat transfer in twin-screw extruder including barrel, polymer, and screws during preheating is established in order to predict the distribution and variation of temperature in extruder, and situation of melting of polymer in groove of screw. Numerical results show that temperature in the middle of barrel and close to the heating pipeline is higher than those in other places by the influence of distribution of heating pipeline as well as melting of polymer is faster. Average temperature of 8-type surfaces of barrel, polymer, and screw increases with preheating time. The temperature of 8-type surface of barrel during early preheating rises faster than those of others, and reaches steady fastest in end of the preheating, while the situation of screw is opposite to that of 8-type surface of barrel. The melting speed of polymer in barrel decreases with the preheating time cooperating with the change of temperature. The results have signification to guiding design and optimization of heating pipeline in barrel, and exactly predicting safety time of preheating.

Key words: Extruder, Melting, Numerical simulation, Polymer, Twin-screw

中图分类号: