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IUTAM Symposium on Computational Approaches to Multiphase FlowOn Fluid-Particle and Particle-Particle Interactons in Gas-Solid Turbulent Channel Flow

IUTAM Symposium on Computational Approaches to Multiphase Flow: On Fluid-Particle and... [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.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

IUTAM Symposium on Computational Approaches to Multiphase FlowOn Fluid-Particle and Particle-Particle Interactons in Gas-Solid Turbulent Channel Flow

Part of the Fluid Mechanics and Its Applications Book Series (volume 81)
Editors: Balachandar, S.; Prosperetti, A.
Squires, Kyle D.; Simonin, Olivier
IUTAM Symposium on Computational Approaches to Multiphase Flow — Jan 1, 2006
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9 pages

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Publisher
Springer Netherlands
Copyright
© Springer 2006
ISBN
978-1-4020-4976-7
Pages
11 –20
DOI
10.1007/1-4020-4977-3_2
Publisher site
See Chapter on Publisher Site

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.]

Published: Jan 1, 2006

Keywords: Particle Velocity; Stokes Number; Velocity Correlation; Subgrid Modeling; Disperse Phase Velocity

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