Flow field visualization of entangled polybutadiene solutions under nonlinear viscoelastic flow conditions
Name
McKinley_Flow field.pdf
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1.06 MB
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Checksum (MD5)
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Author(s)
Li, Yanfei
Hu, Miao
McKenna, Gregory B.
Dimitriou, Christopher J.
McKinley, Gareth H.
Mick, Rebecca M.
Venerus, David C.
Archer, Lynden A.
Date Issued
August 2013
Journal
Journal of Rheology
Publisher
American Institute of Physics (AIP)
Citation
Li, Yanfei, Miao Hu, Gregory B. McKenna, Christopher J. Dimitriou, Gareth H. McKinley, Rebecca M. Mick, David C. Venerus, and Lynden A. Archer. “Flow Field Visualization of Entangled Polybutadiene Solutions Under Nonlinear Viscoelastic Flow Conditions.” J. Rheol. 57, no. 5 (2013): 1411.
Version
Author's final manuscript
Abstract
Using self-designed particle visualization instrumentation, startup shear and step-strain tests were conducted under a series of systematically varied rheological and geometrical conditions, and the velocity profiles in three different well-entangled polybutadiene/oligomer solutions were obtained. For startup shear tests, in the regime of entanglement densities up to 89 and nominal reptation Weissenberg numbers up to 18.6, we generally observe either wall slip and a linear velocity/strain profile or simply the linear profile with no wall slip unless a massive edge fracture or instability has occurred in the sample. Meanwhile, step-strain tests conducted at similar and higher step Weissenberg numbers revealed little particle motion upon cessation. These results lead us to a conclusion that there is no compelling evidence of shear banding or nonquiescent relaxation in the range of entanglement density and Wi investigated; we interpret the results to imply that any observed banding probably correlates with edge effects.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1122/1.4816735
