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Pearling Instabilities of a Viscoelastic Thread.

A Deblais1, K P Velikov1,2, D Bonn1

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We investigated instabilities in viscoelastic polymer solutions under elongational flow, observing distinct "beads-on-a-string" and blistering patterns. The blistering instability arises from a unique coupling between stress and polymer concentration.

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Area of Science:

  • Fluid dynamics
  • Polymer science
  • Rheology

Background:

  • Pearling instabilities in viscoelastic threads are complex and not fully understood.
  • These instabilities are crucial in processes involving polymer solutions under flow.

Purpose of the Study:

  • To investigate the mechanisms behind pearling instabilities in polymer solutions during uniaxial elongational flow.
  • To differentiate between capillary-driven and stress-coupled instabilities.

Main Methods:

  • Subjecting polymer solutions to uniaxial elongational flow.
  • Observing and characterizing different instability structures (beads-on-a-string, blistering).
  • Varying temperature to alter solution properties and study flow-phase separation interplay.

Main Results:

  • Two distinct instabilities were identified: beads-on-a-string and blistering.
  • The beads-on-a-string instability is attributed to capillary forces.
  • The blistering instability originates from a coupling between stress and polymer concentration.

Conclusions:

  • The study elucidates the distinct origins of different pearling instabilities in viscoelastic threads.
  • It highlights the role of stress-polymer concentration coupling in blistering instability.
  • Temperature-dependent analysis reveals the interplay between flow and phase separation in polymer solutions.