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Fluids 2018, 3(3), 47; https://doi.org/10.3390/fluids3030047

Rheology of an Inverted Cholesteric Droplet under Shear Flow

1
Department of Chemical Engineering, Kyoto University, Kyoto 615-8510, Japan
2
Department of Physics and Sezione INFN Bari, 70126 Bari, Italy
3
Istituto Applicazioni Calcolo, CNR, 70126 Bari, Italy
4
Departmento of Physics and Astronomy and Sezione INFN, Università di Padova, 35131 Padova, Italy
5
Center for Life Nano Science, IIT, 00161 Roma, Italy
*
Author to whom correspondence should be addressed.
Received: 20 May 2018 / Revised: 26 June 2018 / Accepted: 28 June 2018 / Published: 3 July 2018
(This article belongs to the Special Issue Liquid Crystal Rheology)
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Abstract

The dynamics of a quasi two-dimensional isotropic droplet in a cholesteric liquid crystal medium under symmetric shear flow is studied by lattice Boltzmann simulations. We consider a geometry in which the flow direction is along the axis of the cholesteric, as this setup exhibits a significant viscoelastic response to external stress. We find that the dynamics depends on the magnitude of the shear rate, the anchoring strength of the liquid crystal at the droplet interface and the chirality. While low shear rate and weak interface anchoring the system shows a non-Newtonian behavior, a Newtonian-like response is observed at high shear rate and strong interface anchoring. This is investigated both by estimating the secondary flow profile, namely a flow emerging along the out-of-plane direction (absent in fully-Newtonian fluids, such as water) and by monitoring defect formation and dynamics, which significantly alter the rheological response of the system. View Full-Text
Keywords: cholesteric liquid crystals; shear dynamics; emulsions cholesteric liquid crystals; shear dynamics; emulsions
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Fadda, F.; Gonnella, G.; Lamura, A.; Orlandini, E.; Tiribocchi, A. Rheology of an Inverted Cholesteric Droplet under Shear Flow. Fluids 2018, 3, 47.

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