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Modelling of turbulent gas-particle flow
KTH, School of Engineering Sciences (SCI), Mechanics.
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

An Eulerian-Eulerian model for dilute gas-particle turbulent flows is developed for engineering applications. The aim is to understand the effect of particles on turbulent flows. The model is implemented in a finite element code which is used to perform numerical simulations. The feedback from the particles on the turbulence and the mean flow of the gas in a vertical channel flow is studied. In particular, the influence of the particle response time and particle volume fraction on the preferential concentration of the particles near the walls, caused by the turbophoretic effect is explored. The study shows that the particle feedback decreases the accumulation of particles on the walls. It is also found that even a low particle volume fraction can have a significant impact on the turbulence and the mean flow of the gas. A model for the particle fluctuating velocity in turbulent gas-particle flow is derived using a set of stochastic differential equations. Particle-particle collisions were taken into account. The model shows that the particle fluctuating velocity increases with increasing particle-particle collisions and that increasing particle response times decrease the fluctuating velocity.

Place, publisher, year, edition, pages
Stockholm: KTH , 2008. , viii, 24 p.
Series
Trita-MEK, ISSN 0348-467X ; 2008:01
Keyword [en]
turbulent gas-particle flows, modelling, turbophoresis, two-way coupling
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-4639OAI: oai:DiVA.org:kth-4639DiVA: diva2:13190
Presentation
2008-03-12, E2, E-huset, Lindstedtsvägen 3, Stockholm, 14:15
Opponent
Supervisors
Note
QC 20101124Available from: 2008-02-20 Created: 2008-02-20 Last updated: 2010-11-24Bibliographically approved
List of papers
1. Modelling of turbulent gas-particle flows with focus on two-way coupling effects on turbophoresis
Open this publication in new window or tab >>Modelling of turbulent gas-particle flows with focus on two-way coupling effects on turbophoresis
2012 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 224, 36-45 p.Article in journal (Refereed) Published
Abstract [en]

An Eulerian model was developed for turbulent gas-particle flow that takes into account the influence of particles on the gas-phase turbulence. For the description of the particle-phase stress the kinetic theory of granular flow and the simpler Hinze model were adopted. A K-ω model was used as the gas phase turbulence model. The difference between one- and two-way coupling was investigated for different particle volume fractions and particle diameters. It was found that particles with a much higher density than the fluid substantially affect the gas-phase in turbulent channel flow for particle volume fractions as low as 10 -4. The models with the particle-phase stress described by the kinetic theory of granular flow and the simpler Hinze model produce similar results for particles with small response times but deviate for larger response times. The study shows that two-way coupling and the turbophoretic effect must be taken into account in models even at relatively low particle volume fractions.

Keyword
Concentration profiles, Fluid mechanics and transport phenomena, Modelling, Turbophoresis, Turbulent gas-particle flows, Two-way coupling
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-7988 (URN)10.1016/j.powtec.2012.02.017 (DOI)000304792000005 ()2-s2.0-84860504866 (Scopus ID)
Funder
Swedish e‐Science Research Center
Note

QS 20120529. Updated from submitted to published.

Available from: 2008-02-20 Created: 2008-02-20 Last updated: 2017-12-14Bibliographically approved
2. Modelling of particle fluctuations in turbulence by stochastic processes
Open this publication in new window or tab >>Modelling of particle fluctuations in turbulence by stochastic processes
(English)Manuscript (Other academic)
Identifiers
urn:nbn:se:kth:diva-7989 (URN)
Note
QC 20100726Available from: 2008-02-20 Created: 2008-02-20 Last updated: 2010-11-24Bibliographically approved

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CiteExportLink to record
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Output format
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