摘要
提出了简化的准三维模型 ,由于实际螺槽内物料性能变化使模型的数值求解很难 ,因此采用沿流方向逐步计算的有限元法数值求解。解出了螺槽内三维温度场和速度场 ,压力曲线 ,剪切速率等。比较非牛顿流体的实验结果与模型计算结果 ,二者吻合很好。此外由计算结果发现在流道横截面内存在强烈的环流 ,而只有三维模型才反映了这种环流影响 ,进一步证实三维模型研究是必要的。
The study of three dimension modeling is very important to thoroughly understand the polymer melt flow in single screw channel. In this paper, a simplified quasi three dimension model was presented. Property variations of polymer make the problem a very difficult one to model numerically. Therefore, the transport processed in the extruder channel are simulated by means of a finite element shceme which employs marching in the down channel direction. Numerical results are presented on the temperature and velocity fields, pressure and shear rate. The comparisons with experimental results indicate good agreement. A strong recirculating flow is found to arise over the cross section of the channel. It is shown that a three dimension modeling of the process is necessary to capture the effects of recirculation in the channel.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2000年第3期20-23,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金!资助项目 (2 9874 0 0 6 )
关键词
三维模型
熔体输送
单螺杆挤出
高聚物
three dimension modeling
single screw
melt transport
finite element
recirculating
