低密度聚乙烯熔体挤出胀大的实验和数值模拟预测  

Experiments and Numerical Simulation of Die Swell for LDPE Melt

作　　者：黄树新[1] 江体乾[2] 鲁传敬[1] 黄进[2] 

机构地区：[1]上海交通大学工程力学系,上海200030 [2]华东理工大学化工学院,上海200237

出　　处：《上海交通大学学报》2003年第4期535-540,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助重点项目 ( 1963 2 0 0 4)

摘　　要：对一种国产低密度聚乙烯 ( LDPE)进行了经过长毛细管的挤出胀大流动实验测量 ,得到了挤出胀大比和流动曲线 .测定了材料的线性和非线性粘弹性 ,并用 PSM模型进行了表征 ,同时数值模拟了 LDPE熔体的挤出胀大流动 .预测结果与实验基本吻合 ,但在较高剪切速率下两者间还存在一定的偏差 。Extrudate swell is a common phenomenon in polymer extrusion processing. Extrusion experiments through a long capillary die for a Chinese LDPE were carried out, and swell ratios and flow curve were obtained. Linear and nonlinear viscoelastic characteristics for the LDPE were tested and described using PSM model. At the same time, a numerical simulation of extrudate swell flow for the LDPE melt was investigated. The calculated swelling results are similar to the experimental values basically, but there exist deviation between them at the higher shear rate. And the cause of the deviation was analyzed.

关 键 词：低密度聚乙烯 挤出胀大实验 流变性测量实验 PSM模型 数值模拟 

分 类 号：O373[理学—流体力学]