### Abstract

Large-Eddy Simulation (LES) and Discrete Particle Simulation (DPS) are used to highlight effects of fluid-particle and particle-particle interactions on dispersed-phase transport in fully-developed turbulent channel flow. A range of particle Stokes numbers in the simulations are considered that lead to strong changes in particle response. In the absence of inter-particle collisions, the calculations illustrate the characteristic build-up of particles in the near-wall region. While mean shear in the carrier and dispersed phase velocities is an important effect in wall-bounded flows, LES/DPS results show that the particle velocity fluctuations in the wall-normal direction are controlled primarily by the drag force and in equilibrium with the corresponding components of the fluid-particle velocity correlation. Inter-particle collisions provide a redistribution mechanism that reduces the strong anisotropy of the particle velocity fluctuations and substantially elevates cross-stream transport. Spatial properties of the particle velocity field are examined using two-point correlations. The correlation functions are discontinuous at the origin and are consistent with a partitioning of the particle velocity by inertia into a spatially-correlated contribution and random component that is not correlated in space. Perspectives and implications of these findings are also discussed.

Original language | English (US) |
---|---|

Title of host publication | Fluid Mechanics and its Applications |

Pages | 11-20 |

Number of pages | 10 |

Volume | 81 |

State | Published - 2006 |

### Publication series

Name | Fluid Mechanics and its Applications |
---|---|

Volume | 81 |

ISSN (Print) | 09265112 |

### Fingerprint

### ASJC Scopus subject areas

- Mechanical Engineering
- Mechanics of Materials
- Fluid Flow and Transfer Processes

### Cite this

*Fluid Mechanics and its Applications*(Vol. 81, pp. 11-20). (Fluid Mechanics and its Applications; Vol. 81).

**On fluid-particle and particle-particle interactions in gas-solid turbulent channel flow.** / Squires, Kyle; Simonin, Olivier.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

*Fluid Mechanics and its Applications.*vol. 81, Fluid Mechanics and its Applications, vol. 81, pp. 11-20.

}

TY - CHAP

T1 - On fluid-particle and particle-particle interactions in gas-solid turbulent channel flow

AU - Squires, Kyle

AU - Simonin, Olivier

PY - 2006

Y1 - 2006

N2 - Large-Eddy Simulation (LES) and Discrete Particle Simulation (DPS) are used to highlight effects of fluid-particle and particle-particle interactions on dispersed-phase transport in fully-developed turbulent channel flow. A range of particle Stokes numbers in the simulations are considered that lead to strong changes in particle response. In the absence of inter-particle collisions, the calculations illustrate the characteristic build-up of particles in the near-wall region. While mean shear in the carrier and dispersed phase velocities is an important effect in wall-bounded flows, LES/DPS results show that the particle velocity fluctuations in the wall-normal direction are controlled primarily by the drag force and in equilibrium with the corresponding components of the fluid-particle velocity correlation. Inter-particle collisions provide a redistribution mechanism that reduces the strong anisotropy of the particle velocity fluctuations and substantially elevates cross-stream transport. Spatial properties of the particle velocity field are examined using two-point correlations. The correlation functions are discontinuous at the origin and are consistent with a partitioning of the particle velocity by inertia into a spatially-correlated contribution and random component that is not correlated in space. Perspectives and implications of these findings are also discussed.

AB - Large-Eddy Simulation (LES) and Discrete Particle Simulation (DPS) are used to highlight effects of fluid-particle and particle-particle interactions on dispersed-phase transport in fully-developed turbulent channel flow. A range of particle Stokes numbers in the simulations are considered that lead to strong changes in particle response. In the absence of inter-particle collisions, the calculations illustrate the characteristic build-up of particles in the near-wall region. While mean shear in the carrier and dispersed phase velocities is an important effect in wall-bounded flows, LES/DPS results show that the particle velocity fluctuations in the wall-normal direction are controlled primarily by the drag force and in equilibrium with the corresponding components of the fluid-particle velocity correlation. Inter-particle collisions provide a redistribution mechanism that reduces the strong anisotropy of the particle velocity fluctuations and substantially elevates cross-stream transport. Spatial properties of the particle velocity field are examined using two-point correlations. The correlation functions are discontinuous at the origin and are consistent with a partitioning of the particle velocity by inertia into a spatially-correlated contribution and random component that is not correlated in space. Perspectives and implications of these findings are also discussed.

UR - http://www.scopus.com/inward/record.url?scp=84860003251&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860003251&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:84860003251

SN - 9781402049767

VL - 81

T3 - Fluid Mechanics and its Applications

SP - 11

EP - 20

BT - Fluid Mechanics and its Applications

ER -