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Increase of turbulent drag by polymers in particle suspensions
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), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. Grad Univ, Okinawa Inst Sci & Technol, Complex Fluids & Flows Unit, 1919-1 Tancha, Onna Son, Okinawa 9040495, Japan..ORCID iD: 0000-0002-9004-2292
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), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.ORCID iD: 0000-0002-4346-4732
2020 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 5, no 4, article id 041301Article in journal (Refereed) Published
Abstract [en]

We study the effect of spherical particles on the turbulent flow of a viscoelastic fluid and find that the drag reducing effect of polymer additives is completely lost for semidense suspensions, with the drag increasing more than for suspensions in Newtonian fluids. This different behavior is due to three separate effects. First, polymer stretching is reduced by the presence of rigid particles, thus canceling the drag reducing benefit of the viscoelastic fluid. Second, drag increase is provided by the growth of the particle and polymeric shear stresses with the particles, due to larger shear rates in the vicinity of the particle surface. Third, particles migrate towards the wall due to the shear-thinning property of the fluid, thus enhancing the particle near-wall layer and further increasing the drag.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2020. Vol. 5, no 4, article id 041301
National Category
Fluid Mechanics and Acoustics
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URN: urn:nbn:se:kth:diva-272812DOI: 10.1103/PhysRevFluids.5.041301ISI: 000524339600001OAI: oai:DiVA.org:kth-272812DiVA, id: diva2:1427060
Note

QC 20200428

Available from: 2020-04-28 Created: 2020-04-28 Last updated: 2020-04-28Bibliographically approved

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Rosti, Marco E.Brandt, Luca

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