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Iterated Stretching, Extensional Rheology and Formation of Beads-on-a-String Structures in Polymer Solutions

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Show simple item record Oliveira, Monica S. N. Yeh, Roger McKinley, Gareth H. 2006-02-14T16:48:17Z 2006-02-14T16:48:17Z 2005-12-01T16:48:17Z
dc.description Accepted for publication in JNNFM, December 2005. en
dc.description.abstract The transient extensional rheology and the dynamics of elastocapillary thinning in aqueous solutions of polyethylene oxide (PEO) are studied with high-speed digital video microscopy. At long times, the evolution of the thread radius deviates from self-similar exponential decay and competition between elastic, capillary and inertial forces leads to the formation of a periodic array of beads connected by axially-uniform ligaments. This configuration is unstable and successive instabilities propagate from the necks connecting the beads and ligaments. This iterated process results in multiple generations of beads developing along the string in general agreement with predictions of Chang et al. [Phys Fluids, 11, 1717 (1999)] although the experiments yield a different recursion relation between the successive generations of beads. At long times, finite extensibility truncates the iterated instability, and slow axial translation of the bead arrays along the interconnecting threads leads to progressive coalescence before the ultimate rupture of the fluid column. Despite these dynamical complexities it is still possible to measure the steady growth in the transient extensional viscosity by monitoring the slow capillarydriven thinning in the cylindrical ligaments between beads. en
dc.description.sponsorship NASA and the Portuguese Science Foundation en
dc.format.extent 4546438 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.relation.ispartofseries 05-P-12 en
dc.subject extensional rheology en
dc.subject beads on a string en
dc.subject self-similarity en
dc.subject iterative process en
dc.title Iterated Stretching, Extensional Rheology and Formation of Beads-on-a-String Structures in Polymer Solutions en
dc.type Preprint en

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