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Evdokia Achilleos, Georgios C. Georgiou, Savvas G. Hatzikiriakos
On numerical simulation of polymer extrusion instabilities

Appl. Rheol. 12:2 (2002) 88-104

Abstract: 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. © 2002 Applied Rheology.

DOI 10.3933/ApplRheol-12-88

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