Probing the dynamics of polymer solutions in extensional flow using step strain rate experiments

This paper sets out to examine the response of polymer solutions to time-dependent strain rates. Following a step-change in strain rate, the polymer solution was observed to respond almost instantaneously to the imposed flow rate. Under all extension histories having a positive extension rate that w...

Full description

Saved in:
Bibliographic Details
Published in:Journal of non-Newtonian fluid mechanics 1999-05, Vol.82 (2), p.203-232
Main Authors: Orr, N.V., Sridhar, T.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper sets out to examine the response of polymer solutions to time-dependent strain rates. Following a step-change in strain rate, the polymer solution was observed to respond almost instantaneously to the imposed flow rate. Under all extension histories having a positive extension rate that were investigated, the instantaneous stress is proportional to instantaneous strain rate multiplied by a function of the strain. Simulations using the FENE-P model were unable to capture these trends. A pause was introduced in a constant strain rate experiment and revealed that the stress growth upon re-inception of flow was significantly faster predicted by simple constitutive equations. The stress growth depends not only on the current stress and imposed deformation but also on the history of deformation as stored in the configuration distribution of the chain.
ISSN:0377-0257
1873-2631
DOI:10.1016/S0377-0257(98)00163-3