Mechanism for extrusion instabilities in polymer melts

M. Fyrillas, G. Georgiou, D. Vlassopoulos, S. Hatzikiriakos

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A mechanism for explaining some of the instabilities observed during the extrusion of polymer melts is further explored. This is based on the combination of non-monotonic slip and elasticity, which permits the existence of periodic solutions in viscometric flows. The time-dependent, incompressible, one-dimensional plane Poiseuine flow of an Oldroyd-B fluid with slip along the wall is studied using a nonmonotonic slip equation relating the shear stress to the velocity at the wall. The stability of the steady-state solutions to one-dimensional perturbations at fixed volumetric flow rate is analyzed by means of a linear stability analysis and finite element calculations. Self-sustained periodic oscillations of the pressure gradient are obtained when an unstable steady-state is perturbed, in direct analogy with experimental observations.

Original languageEnglish
Pages (from-to)2498-2504
Number of pages7
JournalPolymer Engineering and Science
Volume39
Issue number12
DOIs
Publication statusPublished - Dec 1999
Externally publishedYes

Fingerprint

Polymer melts
Extrusion
Linear stability analysis
Pressure gradient
Shear stress
Elasticity
Flow rate
Fluids

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Fyrillas, M., Georgiou, G., Vlassopoulos, D., & Hatzikiriakos, S. (1999). Mechanism for extrusion instabilities in polymer melts. Polymer Engineering and Science, 39(12), 2498-2504. https://doi.org/10.1002/pen.11637

Mechanism for extrusion instabilities in polymer melts. / Fyrillas, M.; Georgiou, G.; Vlassopoulos, D.; Hatzikiriakos, S.

In: Polymer Engineering and Science, Vol. 39, No. 12, 12.1999, p. 2498-2504.

Research output: Contribution to journalArticle

Fyrillas, M, Georgiou, G, Vlassopoulos, D & Hatzikiriakos, S 1999, 'Mechanism for extrusion instabilities in polymer melts', Polymer Engineering and Science, vol. 39, no. 12, pp. 2498-2504. https://doi.org/10.1002/pen.11637
Fyrillas M, Georgiou G, Vlassopoulos D, Hatzikiriakos S. Mechanism for extrusion instabilities in polymer melts. Polymer Engineering and Science. 1999 Dec;39(12):2498-2504. https://doi.org/10.1002/pen.11637
Fyrillas, M. ; Georgiou, G. ; Vlassopoulos, D. ; Hatzikiriakos, S. / Mechanism for extrusion instabilities in polymer melts. In: Polymer Engineering and Science. 1999 ; Vol. 39, No. 12. pp. 2498-2504.
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