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Numerical simulations of vorticity banding of emulsions in shear flows
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-8616-269x
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Mechanics. Okinawa Inst Sci & Technol Grad Univ, Complex Fluids & Flaws Unit, 1919-1 Tancha, Onna Son, Okinawa 9040495, Japan..ORCID iD: 0000-0002-9004-2292
Univ Naples Federico II, Dept Chem Mat & Ind Prod Engn, Ple Tecchio 80, I-80125 Naples, Italy..
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Superseded Departments (pre-2005), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-4346-4732
2020 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 16, no 11, p. 2854-2863Article in journal (Refereed) Published
Abstract [en]

Multiphase shear flows often show banded structures that affect the global behavior of complex fluids e.g. in microdevices. Here we investigate numerically the banding of emulsions, i.e. the formation of regions of high and low volume fractions, alternated in the vorticity direction and aligned with the flow (shear bands). These bands are associated with a decrease of the effective viscosity of the system. To understand the mechanism of experimentally observed banding, we have performed interface-resolved simulations of the two-fluid system. The experiments were performed starting with a random distribution of droplets, which under the applied shear, evolve in time resulting in a phase separation. To numerically reproduce this process, the banded structures are initialized in a narrow channel confined by two walls moving in opposite directions. We find that the initial banded distribution is stable when droplets are free to merge and unstable when coalescence is prevented. In this case, additionally, the effective viscosity of the system increases, resembling the rheological behavior of suspensions of deformable particles. Droplet coalescence, on the other hand, allows emulsions to reduce the total surface of the system and, hence, the energy dissipation associated with the deformation, which in turn reduces the effective viscosity.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2020. Vol. 16, no 11, p. 2854-2863
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-271929DOI: 10.1039/c9sm01898kISI: 000521354400018PubMedID: 32107513Scopus ID: 2-s2.0-85082095925OAI: oai:DiVA.org:kth-271929DiVA, id: diva2:1424963
Note

QC 20200420

Available from: 2020-04-20 Created: 2020-04-20 Last updated: 2020-04-20Bibliographically approved

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De Vita, FrancescoRosti, Marco E.Brandt, Luca

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