Change search
ReferencesLink to record
Permanent link

Direct link
The effect of particle density in turbulent channel flow laden with finite size particles in semi-dilute conditions
KTH, School of Engineering Sciences (SCI), Mechanics. 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. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-4346-4732
2016 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 28, no 3, 033301Article in journal (Refereed) PublishedText
Abstract [en]

We study the effect of varying the mass and volume fraction of a suspension of rigid spheres dispersed in a turbulent channel flow. We performed several direct numerical simulations using an immersed boundary method for finite-size particles changing the solid to fluid density ratio R, the mass fraction χ, and the volume fraction φ. We find that varying the density ratio R between 1 and 10 at constant volume fraction does not alter the flow statistics as much as when varying the volume fraction φ at constant R and at constant mass fraction. Interestingly, the increase in overall drag found when varying the volume fraction is considerably higher than that obtained for increasing density ratios at same volume fraction. The main effect at density ratios R of the order of 10 is a strong shear-induced migration towards the centerline of the channel. When the density ratio R is further increased up to 1000, the particle dynamics decouple from that of the fluid. The solid phase behaves as a dense gas and the fluid and solid phase statistics drastically change. In this regime, the collision rate is high and dominated by the normal relative velocity among particles.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2016. Vol. 28, no 3, 033301
Keyword [en]
Low-Reynolds-Number, Numerical-Simulation, Molecular Dimensions, Suspensions, Rheology, Spheres, Fluid, Microstructure, Statistics, Stress
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-187293DOI: 10.1063/1.4942518ISI: 000373600600023ScopusID: 2-s2.0-84959563104OAI: oai:DiVA.org:kth-187293DiVA: diva2:929853
Funder
EU, European Research Council, ERC-2013-CoG-616186Swedish Research Council
Note

QC 20160520

Available from: 2016-05-20 Created: 2016-05-19 Last updated: 2016-05-20Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Fornari, WalterBrandt, Luca
By organisation
MechanicsLinné Flow Center, FLOWSeRC - Swedish e-Science Research Centre
In the same journal
Physics of fluids
Other Physics Topics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 8 hits
ReferencesLink to record
Permanent link

Direct link