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Effects of polymer additives on turbophoresis in a turbulent channel flow
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-9172-6311
KTH, Skolan för teknikvetenskap (SCI).ORCID-id: 0000-0002-3943-8187
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-4346-4732
2020 (engelsk)Inngår i: ETC 2013 - 14th European Turbulence Conference, Zakon Group LLC , 2020Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Turbophoresis is the migration of inertial particles towards the wall in a wall-bounded flow induced by turbulence. In this work, we analyze the effects of drag reducing polymer additives on turbophoresis in a turbulent channel flow. The numerical data set is obtained from a direct numerical simulation (DNS) of a turbulent channel flow of a viscoelastic fluid and laden with particles of different inertia. The results indicate that polymer additives decrease the turbophoretic drift. We establish that turbophoresis is reduced because of the smaller wall-normal variation of wall-normal fluid velocity fluctuations that occurs in all drag reducing flows. Hence a reduction of turbophoresis should be a common feature of all drag reducing flows such s fiber, bubble suspensions and MHD.

sted, utgiver, år, opplag, sider
Zakon Group LLC , 2020.
Emneord [en]
Additives, Channel flow, Drag reduction, Polymers, Turbulence, Wall flow, Bubble suspension, Drag-reducing polymers, Inertial particles, Normal variations, Normal-fluid velocity, Turbulent channel flows, Vis-coelastic fluids, Wall bounded flows, Magnetohydrodynamics
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Identifikatorer
URN: urn:nbn:se:kth:diva-274045Scopus ID: 2-s2.0-85085779173OAI: oai:DiVA.org:kth-274045DiVA, id: diva2:1449918
Konferanse
14th European Turbulence Conference, ETC 2013, 1 September 2013 through 4 September 2013
Merknad

QC 20200630

Tilgjengelig fra: 2020-06-30 Laget: 2020-06-30 Sist oppdatert: 2025-02-09bibliografisk kontrollert

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Sardina, GaetanoPicano, FrancescoBrandt, Luca

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