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A study of particle feedback in turbulent gas-particle flows
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
2009 (English)In: A study of particle feedback in turbulent gas-particle flows / [ed] K. Hanjalic, Y. Nagano, S. Jakirlic, New York, Wallingford (UK): Begell House Inc. , 2009, 713-716 p.Conference paper, Published paper (Refereed)
Abstract [en]

The upward turbulent gas-particle flow in a channel was studied usingan Eulerian-Eulerian two-phase model taking into account the feedbackfrom the particles on the gas-phase. The objective is to study theinfluence of particles with different diameters and volume fractionson the flow and particularly on the accumulation of particles in thenear wall region due to the turbophoretic effect. The results wereobtained with a two-phase flow model that is presented. Theaccumulation of particles in the near-wall region was found to bestrongest for particles with τp+ = 13. The model also shows thatvarying the particle diameters leads to different feedback of theparticles on the turbulent flow.

Place, publisher, year, edition, pages
New York, Wallingford (UK): Begell House Inc. , 2009. 713-716 p.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-12127ISBN: 978-1-56700-262-1 (print)OAI: oai:DiVA.org:kth-12127DiVA: diva2:302559
Conference
Sixth International Symposium On Turbulence, Heat and Mass Transfer
Note
QC20100726Available from: 2010-03-08 Created: 2010-03-08 Last updated: 2010-07-26Bibliographically 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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