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Yield-stress fluids in porous media: a comparison of viscoplastic and elastoviscoplastic flows
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.ORCID iD: 0000-0002-5397-2079
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0003-4791-3803
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. Royal Inst Technol KTH, Mech Dept, SERC, Stockholm, Sweden..ORCID iD: 0000-0001-8616-269x
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. Royal Inst Technol KTH, Mech Dept, SERC, Stockholm, Sweden..ORCID iD: 0000-0002-4346-4732
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2020 (English)In: Meccanica (Milano. Print), ISSN 0025-6455, E-ISSN 1572-9648, Vol. 55, no 2, p. 331-342Article in journal (Refereed) Published
Abstract [en]

A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and similarities between these two classes of flows. Small elastic effects increase the pressure drop and also the size of unyielded regions in the flow which is the consequence of different stress solutions compare to viscoplastic flows. Yet, the velocity fields in the viscoplastic and elastoviscoplastic flows are comparable for small elastic effects. By increasing the yield stress, the difference in the pressure drops between the two classes of flows becomes smaller and smaller for both considered geometries. When the elastic effects increase, the elastoviscoplastic flow becomes time-dependent and some oscillations in the flow can be observed. Focusing on the regime of very large yield stress effects in the viscoplastic flow, we address in detail the interesting limit of 'flow/no flow': yield-stress fluids can resist small imposed pressure gradients and remain quiescent. The critical pressure gradient which should be exceeded to guarantee a continuous flow in the porous media will be reported. Finally, we propose a theoretical framework for studying the 'yield limit' in the porous media.

Place, publisher, year, edition, pages
SPRINGER , 2020. Vol. 55, no 2, p. 331-342
Keywords [en]
Porous media, Yield-stress fluid, Viscoplastic fluid, Elastoviscoplastic fluid
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-269011DOI: 10.1007/s11012-019-01010-6ISI: 000512775600004Scopus ID: 2-s2.0-85069205204OAI: oai:DiVA.org:kth-269011DiVA, id: diva2:1416121
Note

QC 20200321

Available from: 2020-03-21 Created: 2020-03-21 Last updated: 2020-03-21Bibliographically approved

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Chaparian, EmadIzbassarov, DauletDe Vita, FrancescoBrandt, LucaTammisola, Outi

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