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

Kyle Squires, Olivier Simonin

Research output: Chapter in Book/Report/Conference proceedingChapter

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 languageEnglish (US)
Title of host publicationIUTAM Symposium on Computational Approaches to Multiphase Flow
EditorsS. BALACHANDAR, A. PROSPERETTI
Pages11-20
Number of pages10
StatePublished - Dec 1 2006

Publication series

NameFluid Mechanics and its Applications
Volume81
ISSN (Print)0926-5112

ASJC Scopus subject areas

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

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  • Cite this

    Squires, K., & Simonin, O. (2006). On fluid-particle and particle-particle interactions in gas-solid turbulent channel flow. In S. BALACHANDAR, & A. PROSPERETTI (Eds.), IUTAM Symposium on Computational Approaches to Multiphase Flow (pp. 11-20). (Fluid Mechanics and its Applications; Vol. 81).