Elastic Rayleigh-Plateau instability: dynamical selection of nonlinear states: Dynamical selection of nonlinear states

Anupam Pandey*, Minkush Kansal, Miguel A. Herrada, Jens Eggers, Jacco H. Snoeijer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A slender thread of elastic hydrogel is susceptible to a surface instability that is reminiscent of the classical Rayleigh-Plateau instability of liquid jets. The final, highly nonlinear states that are observed in experiments arise from a competition between capillarity and large elastic deformations. Combining a slender analysis and fully three-dimensional numerical simulations, we present the phase map of all possible morphologies for an unstable neo-Hookean cylinder subjected to capillary forces. Interestingly, for softer cylinders we find the coexistence of two distinct configurations, namely, cylinders-on-a-string and beads-on-a-string. It is shown that for a given set of parameters, the final pattern is selected via a dynamical evolution. To capture this, we compute the dispersion relation and determine the characteristic wavelength of the dynamically selected profiles. The validity of the "slender"results is confirmed via simulations and these results are consistent with experiments on elastic and viscoelastic threads. This journal is

Original languageEnglish
Pages (from-to)5148-5161
Number of pages14
JournalSoft matter
Volume17
Issue number20
DOIs
Publication statusPublished - 28 May 2021

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