Active Suspensions have Nonmonotonic Flow Curves and Multiple Mechanical Equilibria

Physical Review Letters
Aurore LoisyTanniemola B Liverpool

Abstract

We point out unconventional mechanical properties of confined active fluids, such as bacterial suspensions, under shear. Using a minimal model of an active liquid crystal with no free parameters, we predict the existence of a window of bacteria concentration for which a suspension of E. Coli effectively behaves, at steady-state, as a negative viscosity fluid and reach a quantitative agreement with experimental measurements. Our theoretical analysis further shows that a negative apparent viscosity is due to a nonmonotonic local velocity profile, and it is associated with a nonmonotonic stress versus strain rate flow curve. This implies that fixed stress and fixed strain rate ensembles are not equivalent for active fluids.

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Citations

Apr 2, 2019·Physical Review Letters·Tomer MarkovichMichael E Cates
Jul 22, 2020·Physical Review. E·Sarah TrinschekUwe Thiele
Jun 30, 2019·The European Physical Journal. E, Soft Matter·Livio Nicola CarenzaAdriano Tiribocchi
Dec 20, 2019·Soft Matter·Eric W Burkholder, John F Brady
Feb 20, 2019·Physical Review. E·Hiroshi OriharaTomoyuki Nagaya
May 23, 2020·Physical Review Letters·Fraser MackayDavide Marenduzzo
Jan 11, 2020·Physical Review Letters·Aurore LoisyTanniemola B Liverpool
Jan 23, 2020·Proceedings of the National Academy of Sciences of the United States of America·Vincent A MartinezWilson C K Poon
Sep 19, 2020·Physical Review. E·Zhihan HuangTakuji Ishikawa
Mar 17, 2019·The Journal of Chemical Physics·Aurore LoisyTanniemola B Liverpool
Oct 23, 2020·Biotechnology and Bioengineering·Sara MalvarJulio R Meneghini

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