Comment on "Edge-Induced Shear Banding in Entangled Polymeric Fluids" [arXiv: 1801.08798]
Yangyang Wang, Shi-Qing Wang
TL;DR
This paper critiques a recent study claiming edge effects cause shear banding in entangled polymeric fluids, arguing that bulk shear banding can occur independently of edge disturbances based on prior research.
Contribution
It challenges the conclusion that edge effects preclude true bulk shear banding, highlighting inconsistencies with previous experimental and theoretical findings.
Findings
Previous studies support bulk shear banding independent of edge effects
The criticized work's numerical model has limitations
Edge disturbances do not fully explain shear banding phenomena
Abstract
Based on numerical modeling with the diffusive Giesekus constitutive equation, a recent Letter [Phys. Rev. Lett. 120, 138002 (2018), arXiv:1801.08798] claimed that the experimental reports of shear banding in entangled polymeric fluids were due to the disturbances from the sample edge. The conclusion that true bulk shear banding is precluded in the presence of edge effects is at odds with many past experimental, theoretical, numerical, and computer simulation studies. We briefly discuss some problems of this work.
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Taxonomy
TopicsRheology and Fluid Dynamics Studies · Phase Equilibria and Thermodynamics · Material Dynamics and Properties