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Rheology of active polar emulsions: from linear to unidirectional and inviscid flow, and intermittent viscosity

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Abstract

The rheological behaviour of an emulsion made of an active polar component and an isotropic passive fluid is studied by lattice Boltzmann methods. Different flow regimes are found by varying the values of the shear rate and extensile activity (occurring, e.g., in microtubule-motor suspensions). By increasing the activity, a first transition occurs from the linear flow regime to spontaneous persistent unidirectional macro-scale flow, followed by another transition either to a (low shear) intermittent flow regime with the coexistence of states with positive, negative, and vanishing apparent viscosity, or to a (high shear) symmetric shear thinning regime. The different behaviours can be explained in terms of the dynamics of the polarization field close to the walls. A maximum entropy production principle selects the most likely states in the intermittent regime.

Graphical abstract: Rheology of active polar emulsions: from linear to unidirectional and inviscid flow, and intermittent viscosity

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Publication details

The article was received on 28 Jun 2019, accepted on 12 Sep 2019 and first published on 25 Sep 2019


Article type: Paper
DOI: 10.1039/C9SM01288E
Soft Matter, 2019, Advance Article

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    Rheology of active polar emulsions: from linear to unidirectional and inviscid flow, and intermittent viscosity

    G. Negro, L. N. Carenza, A. Lamura, A. Tiribocchi and G. Gonnella, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM01288E

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