Numerical simulation of sharkskin phenomena in polymer melts

Applied Rheology

Volumn 13, Issue 2, 2003, Pages 79-86

  Nithi Uthai, Nattapong ^a   Manas Zloczower, Ica ^a  

^a CASE WESTERN RESERVE UNIVERSITY   (United States)

Author keywords

Extrudate swell; Finite element method; Flow instabilities; Numerical simulations; Sharkskin; Stress relaxation stress growth

Indexed keywords

COMPUTATIONAL FLUID DYNAMICS; FINITE ELEMENT METHOD; POLYMER MELT; STRESS; SWELL;

EID: 0037932027     PISSN: 14306395     EISSN: None     Source Type: Journal    
DOI: 10.1515/arh-2003-0006     Document Type: Article

References (22)

1. Molenaar J, Koopmans RJ: Modeling polymer melt-flow instabilities. J. Rheology 38 (1994) 99-109.
2. Georgiou GC, Crochet MJ: Time-dependent compressible extrudate-swell problem with slip at the wall. J. Rheology 38 (1994) 1745-1755.
3. Venet C, Vergnes B: Experimental Characterization of Sharkskin in Polyethylenes, J. Rheology 41 (1997) 873-892.
4. Graham MD: The sharkskin instability of polymer melt flows. Chaos 9 (1999) 154-163.
5. Denn MM: Extrusion instabilities and wall slip. Annu. Rev. Fluid Mech. 33 (2001) 265-297.
6. Barone JR, Plucktaveesak N, Wang S-Q: Interfacial Molecular Instability Mechanism for Sharkskin Phenomenon in Capillary Extrusion of Linear Polyethylenes. J. Rheology 42 (1998) 813-832.
7. Wang S-Q, Drda PA, Inn Y-W: Exploring molecular origins of sharkskin, partial slip, and slope change in flow curves of linear low density polyethylene. J. Rheology 40 (1996) 875-898.
8. Yarin AL, Graham MD: A model for slip at polymer/solid interfaces. J. Rheology 42 (1998) 1491-1503.
9. Lipscomb GG, Keunings R, Denn MM: Implications of boundary singularities in complex geometries. J. Non-Newtonian Fluid Mech. 24 (1987) 85-96.
10. Mhetar V, Archer LA: Slip in Entangled Polymer Solutions. Macromolecules 31(1998) 6639-6649.
11. Ahmed R, Liang RF, Mackley MR: The experimental observation and numerical prediction of planar entry flow and die swell for molten polyethylenes. J. Non-Newtonian Fluid Mech. 59 (1995) 129-153.
12. Ahmed R, Mackley MR: Experimental conterline planar extension of polyethylene melt flowing into a slit die. J. Non-Newtonian Fluid Mech. 56 (1995) 127-149.
13. Venet C, Vergnes B: Stress distribution around capillary die exit: an interpretation of the onset of sharkskin defect. J. Non-Newtonian Fluid Mech. 93 (2000) 117-132.
14. Barone J, Wang S-Q: Flow birefringence study of sharkskin and stress relaxation in polybutadiene melts. Rheol. Acta 38 (1999) 404-414.
15. Barone J, Wang S-Q: Rheo-optical observations of sharkskin formation in slit-die extrusion. J. Rheology 45 (2001) 49-59.
16. Wang S-Q, Drda P: Molecular instabilities in capillary flow of polymer melts: interfacial stick-slip transition, wall slip and extrudate distortion. Macomol. Chem. Phys. 198 (1997) 673-701.
17. Wang S-Q: Letter to the Editor - The mystery of the mechanism of sharkskin. J. Rheology 43 (1999) 245-252.
18. Jay P: The reduction of viscous extrusion stresses and extrudate swell computation using slippery exit surfaces. J. Non-Newtonian Fluid Mech 79 (1998) 599-617.
19. Giesekus H: A Simple Constitutive Equation for Polymer Fluids Based on the Concept of Deformation-Dependent Tensorial Mobility. J. Non-Newtonian Fluid Mech 11 (1982) 69-109.
20. Yao M, McKinley GH, Debbaut B: Extensional deformation, stress relaxation and necking failure of viscoelastic filaments. J. Non-Newtonian Fluid Mech 79 (1998) 469-501.
21. Nithi-Uthai N, Manas-Zloczower I: Numerical studies of the effect of constitutive model parameters as reflecting polymer molecular structure on extrudate swell, Appl. Rheol. 12 (2002) 252-259.
22. Yang X, Wang S-Q, Chai C: Extrudate swell behavior of polyethylenes: Capillary flow, Wall slip, Entry/exit effects and Low temperature anomalies. J. Rheology 42 (1998) 1075-1094.