Iterated Stretching and Multiple Beads-on-a-String Phenomena in Dilute Solutions of Highly-Extensible Flexible Polymers
Author(s)
Oliveira, Monica S. N.
McKinley, Gareth H.
Date Issued
April 13, 2005
Series/Report no.
05-P-01;
Abstract
The dynamics of elastocapillary thinning in high molecular weight polymer solutions are re-examined
using high-speed digital video microscopy. At long times, the evolution of the viscoelastic thread deviates from self-similar exponential decay and competition of elastic, capillary and inertial forces leads to the formation of a periodic array of beads connected by axially-uniform ligaments. This configuration is itself unstable and successive instabilities propagate from the necks connecting the beads and ligaments. This
iterated process results in the development of multiple generations of beads in agreement with predictions of Chang et al.1, although experiments yield a different recursion relation between successive generations. At long times, finite extensibility truncates the iterated instability and axial translation of the bead arrays along the interconnecting threads leads to progressive coalescence before rupture of the fluid column.
Description
Preprint submitted to Phys. Fluids (Letters)
Subjects
elastocapillary
beads on a string
PEO
extensional viscosity
Persistent DSpace Link
