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A modelling study of evolving particle-laden turbulent pipe-flow
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9819-2906
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-3336-1462
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-2711-4687
2011 (English)In: Flow Turbulence and Combustion, ISSN 1386-6184, E-ISSN 1573-1987, Vol. 86, no 3-4, 477-495 p.Article in journal (Refereed) Published
Abstract [en]

An Eulerian turbulent two phase flow model using kinetic theory ofgranular flows for the particle phase was developed in order to studyevolving upward turbulent gas particle flows in a pipe. Themodel takes the feedback of the particles into account and its resultsagree well with experiments. Simulations show that the pipe length required for particle laden turbulent flow to become fully developed is up to five times longer than an unladen flow. To increase theunderstanding of the dependence of the development length on particlediameter a simple model for the expected development length wasderived. It shows that the development length becomes shorter forincreasing particle diameters, which agrees with simulations up to aparticle diameter of 100 μm. Thereafter the development lengthbecomes longer again for increasing particle diameters because largerparticles need a longer time to adjust to the velocity of the carrierphase.

Place, publisher, year, edition, pages
2011. Vol. 86, no 3-4, 477-495 p.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-12131DOI: 10.1007/s10494-011-9335-2ISI: 000289210700009Scopus ID: 2-s2.0-79955899672OAI: oai:DiVA.org:kth-12131DiVA: diva2:302575
Funder
Swedish e‐Science Research Center
Note
QC 20110516Available from: 2010-03-08 Created: 2010-03-08 Last updated: 2012-05-24Bibliographically approved
In thesis
1. Model predictions of turbulent gas-particle shear flows
Open this publication in new window or tab >>Model predictions of turbulent gas-particle shear flows
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A turbulent two-phase flow model using kinetic theory of granularflows for the particle phase is developed and implmented in afinite element code. The model can be used for engineeringapplications. However, in this thesis it is used to investigateturbulent gas-particle flows through numerical simulations.  The feedback from the particles on the turbulence and the meanflow of the gas in a vertical channel flow is studied. In particular,the influence of the particle response time, particle volumefraction and particle diameter on the preferential concentration ofthe particles near the walls, caused by the turbophoretic effect isexplored. The study shows that when particle feedback is includedthe accumulation of particles near the walls decreases. It is also foundthat even at low volume fractions particles can have a significant impacton the turbulence and the mean flow of the gas. The effect of particles on a developing turbulent vertical upward pipeflow is also studied. The development length is found to substantiallyincrease compared to an unladen flow. To understand what governs thedevelopment length a simple estimation was derived, showing that itincreases with decreasing particle diameters in accordance with themodel simulations. A model for the fluctuating particle velocity in turbulentgas-particle flow is derived using a set of stochastic differentialequations taking into account particle-particle collisions. Themodel shows that the particle fluctuating velocity increases whenparticle-particle collisions become more important and that increasingparticle response times reduces the fluctuating velocity. The modelcan also be used for an expansion of the deterministic model for theparticle kinetic energy.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. viii, 63 p.
Series
Trita-MEK, ISSN 0348-467X ; 2010:02
Keyword
turbulent gas-particle flows, modelling, turbophoresis, two-way coupling, particle-particle collisions, numerical simulations
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-12135 (URN)978-91-7415-579-2 (ISBN)
Public defence
2010-03-29, F3, Lindstedtsvägen 26, KTH, Stockholm, 14:15 (English)
Opponent
Supervisors
Note
QC20100726Available from: 2010-03-10 Created: 2010-03-08 Last updated: 2010-07-26Bibliographically approved

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Brethouwer, GeertAmberg, GustavJohansson, Arne V.

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