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Effect of die surface on the onset of stick-slip transition in the flow of molten linear polymers

Abstract : We develop a relationship to describe the effect of surface roughness on the stick-slip transition for linear polymers. Using the Brochard-de Gennes slip model and including molecular chain dynamics at the wall, we develop an expression for the critical shear stress for the onset of wall slip as a function of the wettability of the polymer on the die surface or, more precisely, as a function of the apparent contact angle between polymer and die surface. The surface roughness can be also accounted for using additional parameters.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00647830
Contributor : Magalie Prudon <>
Submitted on : Friday, December 2, 2011 - 5:01:43 PM
Last modification on : Wednesday, October 14, 2020 - 3:42:04 AM

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Ahmed Allal, Bruno Vergnes. Effect of die surface on the onset of stick-slip transition in the flow of molten linear polymers. Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2012, Volumes 167-168, pp.46-49. ⟨10.1016/j.jnnfm.2011.10.002⟩. ⟨hal-00647830⟩

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