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Transition to Turbulence in the Presence of Finite Size Particles
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), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre. University of Padova, Italy.
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
2015 (English)In: Procedia IUTAM, Elsevier, 2015, 211-217 p.Conference paper, Published paper (Refereed)
Abstract [en]

We study the transition from laminar to turbulent flow in a channel seeded with finite-size neutrally buoyant particles. A fixed ratio of 10 between the channel height and the particle diameter is considered. The flow is examined in the range of Reynolds numbers 500 ≤ Re ≤; 5000 and the particle volume fractions 0.001 ≤ Φ ≤; 0.3. We report a non-monotonic behavior of the threshold value of the Reynolds number above which the flow becomes turbulent, in agreement with previous experimental studies. The mean square velocity fluctuations and Reynolds shear stress of the fluid phase are reduced by increasing the particle volume fraction at a fixed Re=1500, while the mean square velocities of the solid phase are enhanced monotonically suggesting a transition from fluid to particle dominated dynamics at high volume fraction.

Place, publisher, year, edition, pages
Elsevier, 2015. 211-217 p.
Keyword [en]
finite-size particles, inertial suspensions, Transition, Buoyancy, Reynolds number, Shear flow, Shear stress, Volume fraction, High volume fraction, Mean square velocity, Particle volume fractions, Reynolds shear stress, Transition from laminar to turbulent flows, Transition to turbulence, Suspensions (fluids)
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-176131DOI: 10.1016/j.piutam.2015.03.042ISI: 000380499200025Scopus ID: 2-s2.0-84940662329OAI: oai:DiVA.org:kth-176131DiVA: diva2:875907
Conference
8th IUTAM-ABCM Symposium on Laminar Turbulent Transition, LTT 2014, 8 September 2014 through 12 September 2014
Note

QC 20151202

Available from: 2015-12-02 Created: 2015-11-02 Last updated: 2016-11-23Bibliographically approved

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Brandt, Luca

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