Odd viscosity in chiral active fluids

Debarghya Banerjee, Anton Souslov, Alexander G. Abanov, Vincenzo Vitelli

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We study the hydrodynamics of fluids composed of self-spinning objects such as chiral grains or colloidal particles subject to torques. These chiral active fluids break both parity and time-reversal symmetries in their non-equilibrium steady states. As a result, the constitutive relations of chiral active media display a dissipationless linear-response coefficient called odd (or equivalently, Hall) viscosity. This odd viscosity does not lead to energy dissipation, but gives rise to a flow perpendicular to applied pressure. We show how odd viscosity arises from non-linear equations of hydrodynamics with rotational degrees of freedom, once linearized around a non-equilibrium steady state characterized by large spinning speeds. Next, we explore odd viscosity in compressible fluids and suggest how our findings can be tested in the context of shock propagation experiments. Finally, we show how odd viscosity in weakly compressible chiral active fluids can lead to density and pressure excess within vortex cores.

Original languageEnglish
Article number1573
Pages (from-to)1-12
Number of pages12
JournalNature Communications
Volume8
Issue number1
Early online date17 Nov 2017
DOIs
Publication statusPublished - 17 Nov 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Odd viscosity in chiral active fluids'. Together they form a unique fingerprint.

  • Cite this