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26 April 2024 |
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Odd viscosity in chiral active fluids | | Debarghya Banerjee
; Anton Souslov
; Alexander G. Abanov
; Vincenzo Vitelli
; | | Date: |
8 Feb 2017 | | Abstract: | Chiral active fluids are materials composed of self-spinning rotors that
continuously inject energy and angular momentum at the microscale.
Out-of-equilibrium fluids with active-rotor constituents have been
experimentally realized using nanoscale biomolecular motors, microscale active
colloids, or macroscale driven chiral grains. Here, we show how such chiral
active fluids break both parity and time-reversal symmetries in their steady
states, giving rise to a dissipationless linear-response coefficient called odd
viscosity in their constitutive relations. Odd viscosity couples pressure and
vorticity leading, for example, to density modulations within a vortex profile.
Moreover, chiral active fluids flow in the direction transverse to applied
compression as in shock propagation experiments. We envision that this
collective transverse response may be exploited to design self-assembled
hydraulic cranks that convert between linear and rotational motion in
microscopic machines powered by active-rotors fluids. | | Source: | arXiv, 1702.2393 | | Services: | Forum | Review | PDF | Favorites | |
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