Active Viscoelastic Matter: From Bacterial Drag Reduction to Turbulent Solids

E. J. Hemingway*, A. Maitra, S. Banerjee, M. C. Marchetti, S. Ramaswamy, S. M. Fielding, M. E. Cates

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A paradigm for internally driven matter is the active nematic liquid crystal, whereby the equations of a conventional nematic are supplemented by a minimal active stress that violates time-reversal symmetry. In practice, active fluids may have not only liquid-crystalline but also viscoelastic polymer degrees of freedom. Here we explore the resulting interplay by coupling an active nematic to a minimal model of polymer rheology. We find that adding a polymer can greatly increase the complexity of spontaneous flow, but can also have calming effects, thereby increasing the net throughput of spontaneous flow along a pipe (a "drag-reduction" effect). Remarkably, active turbulence can also arise after switching on activity in a sufficiently soft elastomeric solid.

Original languageEnglish
Article number098302
Number of pages5
JournalPhysical Review Letters
Volume114
Issue number9
DOIs
Publication statusPublished - 5 Mar 2015

Keywords

  • FLOW
  • SUSPENSIONS
  • ELASTICITY
  • PARTICLES
  • MECHANICS
  • NEMATICS
  • BEHAVIOR
  • SHEAR
  • GELS

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