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Mesoscopic model for soft flowing systems with tunable viscosity ratio

Fei, L; Scagliarini, A; Montessori, A; Lauricella, M; Succi, S; Luo, K; (2018) Mesoscopic model for soft flowing systems with tunable viscosity ratio. Physical Review Fluids , 3 (10) , Article 104304. 10.1103/PhysRevFluids.3.104304. Green open access

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Abstract

We propose a mesoscopic model of binary fluid mixtures with tunable viscosity ratio based on a two-range pseudopotential lattice Boltzmann method, for the simulation of soft flowing systems. In addition to the short-range repulsive interaction between species in the classical single-range model, a competing mechanism between the short-range attractive and midrange repulsive interactions is imposed within each species. Besides extending the range of attainable surface tension as compared with the single-range model, the proposed scheme is also shown to achieve a positive disjoining pressure, independently of the viscosity ratio. The latter property is crucial for many microfluidic applications involving a collection of disperse droplets with a different viscosity from that of the continuum phase. As a preliminary application, the relative effective viscosity of a pressure-driven emulsion in a planar channel is computed.

Type: Article
Title: Mesoscopic model for soft flowing systems with tunable viscosity ratio
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevFluids.3.104304
Publisher version: https://doi.org/10.1103/PhysRevFluids.3.104304
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10061938
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