On numerical Simulations of Polymer Extrusion Instabilities

Applied Rheology

Hatzikiriakos Savvas G.¹  Georgiou Georgios C.¹  Achilleos Evdokia¹ 

[1] Department of Mathematics and Statistics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus;

关键词: extrusion instabilities;    melt fracture;    slip;    carreau model;    oldroyd-b model;    compressible flow;    constitutive instability;    viscoelastic flow;   

DOI  :  10.1515/arh-2002-0006

来源: DOAJ

【 摘 要 】

The objective of this study is mainly to review recent work concerning the numerical modeling of the stick-slip and gross melt fracture polymer extrusion instabilities. Three different mechanisms of instability are discussed: (a) combination of nonlinear slip with compressibility; (b) combination of nonlinear slip with elasticity; and (c) constitutive instabilities. Furthermore, preliminary numerical simulations of the time-dependent, compressible extrudate-swell flow of a Carreau fluid with slip at the wall, using a realistic macroscopic slip equation that is based on experimental data for a high-density polyethylene, are presented.

【 授权许可】

Unknown