On numerical simulations of polymer extrusion instabilities
Date
2002ISSN
1430-6395Source
Applied RheologyVolume
12Issue
2Pages
88-104Google Scholar check
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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-sweel 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.