Dynamic self-organization in particle-laden channel flow

Bernardus J. Geurts, A.W. Vreman

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

We study dynamic flow-structuring and mean-flow properties of turbulent particle-laden riser-flow at significant particle volume fractions of about 1.5%. We include particle–particle as well as particle–fluid interactions through inelastic collisions and drag forces, in a so-called four-way coupled description. These interactions are the origin for the emergence of coherent particle swarms in a flow. The dynamic cluster-formation and cluster-disintegration are associated with the competition between turbulent dispersion and inelastic particle collisions. We establish the basic scenario of this self-organization and investigate the dominant mean-flow aspects of the resulting turbulence modulation for particles with high Stokes response-time. Large-eddy simulations of turbulent channel flow, using dynamic subgrid models and particles at a significant volume fraction and realistic mass load are presented. These simulations indicate the development of a thinner boundary layer, a flatter velocity profile, an higher effective Von Kármán constant and an accumulation of particles near the walls. Moreover, it was found that neglecting particle–particle interactions, as done in so-called two-way coupling, leads to a modulated flow which displays a strong ‘center-channel-jet’ that is not found in physical experiments.
Original languageUndefined
Article number10.1016/j.ijheatfluidflow.2006.03.025
Pages (from-to)945-954
Number of pages10
JournalInternational journal of heat and fluid flow
Volume27
Issue number11/5
DOIs
Publication statusPublished - Oct 2006

Keywords

  • Turbulence
  • Turbulence modulation
  • Large eddy simulation
  • Particle laden flow
  • EWI-9007
  • Inelastic collisions
  • IR-63901
  • Channel flow
  • Coherent structures
  • Four-way coupling
  • METIS-237898

Cite this

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title = "Dynamic self-organization in particle-laden channel flow",
abstract = "We study dynamic flow-structuring and mean-flow properties of turbulent particle-laden riser-flow at significant particle volume fractions of about 1.5{\%}. We include particle–particle as well as particle–fluid interactions through inelastic collisions and drag forces, in a so-called four-way coupled description. These interactions are the origin for the emergence of coherent particle swarms in a flow. The dynamic cluster-formation and cluster-disintegration are associated with the competition between turbulent dispersion and inelastic particle collisions. We establish the basic scenario of this self-organization and investigate the dominant mean-flow aspects of the resulting turbulence modulation for particles with high Stokes response-time. Large-eddy simulations of turbulent channel flow, using dynamic subgrid models and particles at a significant volume fraction and realistic mass load are presented. These simulations indicate the development of a thinner boundary layer, a flatter velocity profile, an higher effective Von K{\'a}rm{\'a}n constant and an accumulation of particles near the walls. Moreover, it was found that neglecting particle–particle interactions, as done in so-called two-way coupling, leads to a modulated flow which displays a strong ‘center-channel-jet’ that is not found in physical experiments.",
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author = "Geurts, {Bernardus J.} and A.W. Vreman",
note = "Special issue of the 6th International Symposium on Engineering Turbulence Modelling and Measurements - ETMM6",
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Dynamic self-organization in particle-laden channel flow. / Geurts, Bernardus J.; Vreman, A.W.

In: International journal of heat and fluid flow, Vol. 27, No. 11/5, 10.1016/j.ijheatfluidflow.2006.03.025, 10.2006, p. 945-954.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Dynamic self-organization in particle-laden channel flow

AU - Geurts, Bernardus J.

AU - Vreman, A.W.

N1 - Special issue of the 6th International Symposium on Engineering Turbulence Modelling and Measurements - ETMM6

PY - 2006/10

Y1 - 2006/10

N2 - We study dynamic flow-structuring and mean-flow properties of turbulent particle-laden riser-flow at significant particle volume fractions of about 1.5%. We include particle–particle as well as particle–fluid interactions through inelastic collisions and drag forces, in a so-called four-way coupled description. These interactions are the origin for the emergence of coherent particle swarms in a flow. The dynamic cluster-formation and cluster-disintegration are associated with the competition between turbulent dispersion and inelastic particle collisions. We establish the basic scenario of this self-organization and investigate the dominant mean-flow aspects of the resulting turbulence modulation for particles with high Stokes response-time. Large-eddy simulations of turbulent channel flow, using dynamic subgrid models and particles at a significant volume fraction and realistic mass load are presented. These simulations indicate the development of a thinner boundary layer, a flatter velocity profile, an higher effective Von Kármán constant and an accumulation of particles near the walls. Moreover, it was found that neglecting particle–particle interactions, as done in so-called two-way coupling, leads to a modulated flow which displays a strong ‘center-channel-jet’ that is not found in physical experiments.

AB - We study dynamic flow-structuring and mean-flow properties of turbulent particle-laden riser-flow at significant particle volume fractions of about 1.5%. We include particle–particle as well as particle–fluid interactions through inelastic collisions and drag forces, in a so-called four-way coupled description. These interactions are the origin for the emergence of coherent particle swarms in a flow. The dynamic cluster-formation and cluster-disintegration are associated with the competition between turbulent dispersion and inelastic particle collisions. We establish the basic scenario of this self-organization and investigate the dominant mean-flow aspects of the resulting turbulence modulation for particles with high Stokes response-time. Large-eddy simulations of turbulent channel flow, using dynamic subgrid models and particles at a significant volume fraction and realistic mass load are presented. These simulations indicate the development of a thinner boundary layer, a flatter velocity profile, an higher effective Von Kármán constant and an accumulation of particles near the walls. Moreover, it was found that neglecting particle–particle interactions, as done in so-called two-way coupling, leads to a modulated flow which displays a strong ‘center-channel-jet’ that is not found in physical experiments.

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KW - Turbulence modulation

KW - Large eddy simulation

KW - Particle laden flow

KW - EWI-9007

KW - Inelastic collisions

KW - IR-63901

KW - Channel flow

KW - Coherent structures

KW - Four-way coupling

KW - METIS-237898

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