Abstract
| Original language | Undefined |
|---|---|
| Article number | 10.1016/j.ijheatfluidflow.2006.03.025 |
| Pages (from-to) | 945-954 |
| Number of pages | 10 |
| Journal | International journal of heat and fluid flow |
| Volume | 27 |
| Issue number | 11/5 |
| DOIs | |
| Publication status | Published - 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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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 journal › Article › Academic › peer-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.
KW - Turbulence
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
U2 - 10.1016/j.ijheatfluidflow.2006.03.025
DO - 10.1016/j.ijheatfluidflow.2006.03.025
M3 - Article
VL - 27
SP - 945
EP - 954
JO - International journal of heat and fluid flow
JF - International journal of heat and fluid flow
SN - 0142-727X
IS - 11/5
M1 - 10.1016/j.ijheatfluidflow.2006.03.025
ER -