POLYFLOW ' How to simulate surface and volume defects? Any scientific literature on the topic? Can surface or volume defects such as haze, shark skin, etc. be simulated using POLYFLOW?

The development of surface (or volume) defects may have multiple origins. There are several papers by academia, published in scientific journals. The list below can be completed. Without being exhaustive, typical suggested references are e.g.:

- G.C. Goergiou and M.J. Crochet, Compressible viscous flow in slits with slip at the wall, J. Rheol. 38/3 (1994) 639-654.
- G.C. Georgiou and M.J. Crochet, Time-dependent compressible extrudate swell problem with slip at the wall, J. Rheol. 38/6 (1994) 1745-1755.
- G.C. Georgiou, Extrusion of a compressible Newtonian fluid with periodic inflow and slip at the wall, Rheol. Acta 35 (1996) 531-544.
- E. Brasseur, M.M. Fyrillas, G.C. Georgiou and M.J. Crochet, The time-dependent extrudate-swell problem of an Oldroyd-B fluid with slip along the wall, J. Rheol. 42/3 (1998) 549-566.
- G.C. Georgiou, The time-dependent compressible Poiseuille and extrudate-swell flows of a Carreaut fluid with slip at the wall, J. non-Newt. Fluid Mech. 109 (2003) 93-114.
- J. Molenaar and R.J. Koopmans, Modelling polymer melt-flow instabilities, J. Rheol. 38/1 (1994) 99-109.
- C.F.J. den Doelder, R.J. Koopmans and J. Molenaar, Quantitative modelling of HDPE spurt experiment using wall slip and generalised Newtonian flow, J. non-Newt. Fluid Mech. 79 (1998) 503-514.
- C. Venet and B. Vergnes, Stress distribution around capillary die exit: an interpretation of the onset of sharkskin defect, J. non-Newt. Fluid Mech. 93 (2000) 117-132.
- E. Achilleos, G.C. Georgiou and S.G. Hatzikiriakos, On numerical simulation of polymer extrusion instabilities, Appl. Rheol. 12/2 (2002) 88-104.
- B. Meulenbroek, C. Storm, V. Bertola, C. Wagner, D. Bonn and W. van Saarloos, Intrinsic route to melt fracture in polymer extrusion: a weakly nonlinear subcritical instability of viscoelastic Poiseuille flow, Phys. Rev. Lett. 90/2 (2003) 024502.

See related Solution 1374 linked under Related Solutions tab.

The shape of surface defects is probably not the most important. The possibility of predicting their occurrence is more relevant. The previous information suggests that the origin of surface and volume defects is not yet well established. For the time being, whether one or another explanation is valid or relevant is probably more a matter of choice.

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