Document Type
Article
Publication Date
11-1-2011
Publication Title
Journal of Non-Newtonian Fluid Mechanics
Abstract
The effect of stress diffusivity is examined in both the Oldroyd-B and FENE-P models of a viscoelastic fluid in the low Reynolds (Stokes) limit for a 2D periodic time-dependent flow. A local analytic solution can be obtained when assuming a flow of the form u=Wi-1(x,-y), where Wi is the Weissenberg number. In this case the width of the birefringent strand of the polymer stress scales with the added viscosity as ν1/2, and is independent of the Weissenberg number. Also, the " expected" maximum extension of the polymer coils remains finite with any stress diffusion and scales as Wi·ν-1/2. These predictions closely match the full simulations. As many investigations of viscoelastic fluids incorporate both finite extension as well as polymer stress diffusion we also investigate the FENE-P model with diffusion to see which effect dominates for various model parameters. With this penalization the percent of maximum extension can be predicted based on Wi, ν, and b, the maximum extensibility length.
Keywords
FENE-P, Oldroyd-B, Stress diffusion, Viscoelastic fluid models
Volume
166
Issue
21-22
First Page
1221
Last Page
1228
DOI
10.1016/j.jnnfm.2011.07.009
ISSN
03770257
Recommended Citation
Thomases, Becca, "An Analysis of the Effect of Stress Diffusion on the Dynamics of Creeping Viscoelastic Flow" (2011). Mathematics Sciences: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/mth_facpubs/169
Comments
Archived as published.