Active viscoelastic matter: from bacterial drag reduction to turbulent solids

Physical Review Letters
E J HemingwayM E Cates

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.

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Citations

Jan 20, 2018·Physical Review. E·Stefano S Turzi
May 29, 2018·Soft Matter·Özer DumanGerhard Gompper
Sep 24, 2016·Physical Review Letters·Gaojin Li, Arezoo M Ardekani
Oct 11, 2016·Soft Matter·Ewan J HemingwaySuzanne M Fielding
Sep 10, 2019·Soft Matter·Megan E SzakasitsMichael J Solomon
Apr 15, 2016·Physical Review. E·E J HemingwayS M Fielding
Mar 11, 2017·Physical Review Letters·David OriolaJaume Casademunt
Dec 24, 2019·Physical Review Letters·Ananyo Maitra, Sriram Ramaswamy
Oct 25, 2020·Nature Communications·Federico S GnesottoChase P Broedersz

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