Three-dimensional entrance flow of a low-density polyethylene (LDPE) and a linear low-density polyethylene (LLDPE) into a slit die

Journal of Non-Newtonian Fluid Mechanics

Volumn 153, Issue 2-3, 2008, Pages 82-94

  Hertel, D ^a   Valette, R ^b   Munstedt H ^a  

^a UNIVERSITY OF ERLANGEN NUREMBERG   (Germany)

^b PSL RESEARCH UNIVERSITY   (France)

Author keywords

Laser Doppler velocimetry (LDV); LDPE and LLDPE; Slit die; Three dimensional entrance flow; Velocity overshoot

Indexed keywords

CHEMICALS; DIES; DIFFRACTIVE OPTICAL ELEMENTS; EIGENVALUES AND EIGENFUNCTIONS; FLOW FIELDS; FLOW OF FLUIDS; FLOW PATTERNS; HARDENING; LOW DENSITY POLYETHYLENES; POLYETHYLENES; POLYMER MELTS; POLYMERS; PULSED LASER DEPOSITION; SHEAR FLOW; SHEARING MACHINES; SPEED; STRAIN HARDENING; THERMOPLASTICS; THREE DIMENSIONAL; VEHICULAR TUNNELS; VELOCITY DISTRIBUTION; VISCOSITY; VORTEX FLOW;

APPLIED (CO); BLACK BOXES; DIE ENTRANCE; ELSEVIER (CO); FLOW BEHAVIOURS; FLOW CHANNELS; FLOW CONDITIONING; HELICAL FLOWS; HIGH SHEAR; LASER-DOPPLER VELOCIMETRY (LDV); LINEAR LOW DENSITY POLYETHYLENE (LLDPE); LOW DENSITY POLYETHYLENE (LLDPE); MOLTEN POLYMERS; PURE SHEAR; RHEOMETRY; SHEAR THINNING; STRAIN-HARDENING; SYMMETRY AXIS; TEMPORAL RESOLUTIONS; THREE DIMENSIONAL (3D); TIME DEPENDENCES; VELOCITY COMPONENTS; VELOCITY FIELDS; VELOCITY OVERSHOOTS; VOLUME FLOW; Z DIRECTIONS;

LINEAR LOW DENSITY POLYETHYLENES;

EID: 47049108665     PISSN: 03770257     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jnnfm.2007.11.010     Document Type: Article

References (19)

1. Durst F., and Whitelaw J.H. Principles and Practice of Laser-Doppler-Anemometry. second ed. (1981), Academic Press
2. Bagley E.B., and Birks A.M. Flow of polyethylene into a capillary. J. Appl. Phys. 31 3 (1960) 556-561
3. White S.A., Gotsis A.D., and Baird D.G. Review of the entry flow problem: experimental and numerical. J. Non-Newtonian Fluid Mech. 24 (1987) 121-160
4. White J.L., and Kondo A. Flow patterns in polyethylene and polystyrene melts during extrusion through a die entry region: measurement and interpretation. J. Non-Newtonian Fluid Mech. 3 (1979) 41-64
5. White S.A., and Baird D.G. Flow visualization and birefringence studies on planar entry flow behaviour of polymer melts. J. Non-Newtonian Fluid Mech. 29 (1988) 245-267
6. Rothstein J.P., and McKinley G.H. The axisymmetric contraction-expansion: the role of extensional rheology on vortex growth dynamics and the enhanced pressure drop. J. Non-Newtonian Fluid Mech. 98 (2001) 33-63
7. Lee K., Mackley M.R., McLeish T.C.B., Nicholson T.M., and Harlen O.G. Experimental observation and numerical simulation of transient "stress fangs" within flowing molten polyethylene. J. Non-Newtonian Fluid Mech. 45 (2001) 1261-1277
8. Mitsoulis E., Schwetz M., and Münstedt H. Entry flow of LDPE melts in a planar contraction. J. Non-Newtonian Fluid Mech. 111 (2003) 41-61
9. Mackley M.R., and Moore I.P.T. Experimental velocity distribution measurements of high density polyethylene flowing into and within a slit. J. Non-Newtonian Fluid Mech. 21 (1986) 337-358
10. Wassner E., Schmidt M., and Münstedt H. Entry flow of a PE-LD melt into a slit die: an experimental study by laser-Doppler velocimetry. J. Rheol. 43 (1999) 1-13
11. Martyn M.T., Nakason C., and Coates P.D. Flow visualisation of polymer melts in abrupt contraction extrusion dies: quantification of melt recirculation and flow patterns. J. Non-Newtonian Fluid Mech. 91 (2000) 109-122
12. Sirakov I., Ainser A., Haouche M., and Guillet J. Three-dimensional numerical simulation of viscoelastic contraction flows using the Pom-Pom differential constitutive model. J. Non-Newtonian Fluid Mech. 126 (2005) 163-173
13. Gough T., Spares R., Kelly A.L., and Coates P.D. Coupled 3D stress, velocity and temperature field measurements for flowing linear and branched polymer melts. Proceedings of the Novel Trends in Rheology II. Czech Republic (2007)
14. Schmidt M., Wassner E., and Münstedt H. Set-up and test of a laser-Doppler velocimeter for investigations of flow behaviour of polymer melts. Mech. Time-Depend. Mater. 3 (1999) 371-393
15. Münstedt H., and Laun H.M. Elongational behaviour of a low density polyethylene melt. Rheol. Acta 18 (1979) 492-504
16. Münstedt H., Kurzbeck S., and Egersdörfer L. Influence of molecular structure on rheological properties of polyethylenes. Rheol. Acta 37 (1998) 21-29
17. Wagner M.H., Bastian H., Hachmann P., Meissner J., Kurzbeck S., Münstedt H., and Langouche F. The strain hardening behaviour of linear and long-chain-branched polyolefin melts in extensional flows. Rheol. Acta 39 (2000) 97-109
18. Clemeur N., Rutgers R.P.G., and Debbaut B. Numerical evaluation of three dimensional effects in planar flow birefringence. J. Non-Newtonian Fluid Mech. 123 (2004) 105-120
19. D. Hertel, H. Münstedt. Investigations of the dependence of the entry flow of a low density polyethylene (LDPE) on outer processing parameters, J. Non-Newtonian Fluid Mech., in press, doi:10.1016/j.jnnfm.2004.07.002.