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Universal Scaling Laws for Dense Particle Suspensions in Turbulent Wall-Bounded Flows
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-4346-4732
2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, no 13, article id 134501Article in journal (Refereed) Published
Abstract [en]

The macroscopic behavior of dense suspensions of neutrally buoyant spheres in turbulent plane channel flow is examined. We show that particles larger than the smallest turbulence scales cause the suspension to deviate from the continuum limit in which its dynamics is well described by an effective suspension viscosity. This deviation is caused by the formation of a particle layer close to the wall with significant slip velocity. By assuming two distinct transport mechanisms in the near-wall layer and the turbulence in the bulk, we define an effective wall location such that the flow in the bulk can still be accurately described by an effective suspension viscosity. We thus propose scaling laws for the mean velocity profile of the suspension flow, together with a master equation able to predict the increase in drag as a function of the particle size and volume fraction.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 117, no 13, article id 134501
Keyword [en]
Particle size, Spheres, Turbulence, Viscosity, Wall flow, Continuum limits, Macroscopic behaviors, Mean velocity profiles, Suspension viscosity, Transport mechanism, Turbulent plane channel flow, Turbulent wall-bounded flows, Universal scaling laws
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-193988DOI: 10.1103/PhysRevLett.117.134501ISI: 000383849400007Scopus ID: 2-s2.0-84990247097OAI: oai:DiVA.org:kth-193988DiVA, id: diva2:1037754
Funder
EU, European Research Council, ERC-2013-CoG-616186Swedish Research Council
Note

QC 20161018

Available from: 2016-10-18 Created: 2016-10-14 Last updated: 2017-11-29Bibliographically approved

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