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Concentrated phase emulsion with multicore morphology under shear: A numerical study

A. Tiribocchi1,2, A. Montessori2, F. Bonaccorso1,2,3, M. Lauricella2, and S. Succi1,2,4

  • 1Center for Life Nano Science@La Sapienza, Istituto Italiano di Tecnologia, 00161 Roma, Italy
  • 2Istituto per le Applicazioni del Calcolo CNR, via dei Taurini 19, Rome, Italy
  • 3Department of Physics and INFN, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
  • 4Institute for Applied Computational Science, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA

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Phys. Rev. Fluids 5, 113606 – Published 30 November, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.113606

Abstract

We numerically study the dynamic behavior under a symmetric shear flow of selected examples of concentrated phase emulsions with multicore morphology confined within a microfluidic channel. A variety of nonequilibrium steady states is reported. Under low shear rates, the emulsion is found to exhibit a solidlike behavior, in which cores display a periodic planetarylike motion with approximately equal angular velocity. At higher shear rates, two steady states emerge, one in which all inner cores align along the flow and become essentially motionless and a further one in which some cores accumulate near the outer interface and produce a dynamical elliptical-shaped ring chain, reminiscent of a treadmillinglike structure, while others occupy the center of the emulsion. A quantitative description in terms of the (i) motion of the cores, (ii) rate of deformation of the emulsion, and (iii) structure of the fluid flow within the channel is also provided.

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Phys. Rev. Fluids 5, 113606– Published 30 November, 2020
  • Received 15 June 2020
  • Accepted 4 November 2020
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