Campus Units

Chemical and Biological Engineering

Document Type

Article

Research Focus Area

Computational Fluid Dynamics

Publication Version

Accepted Manuscript

Publication Date

6-25-2018

Journal or Book Title

Journal of Fluid Mechanics

Volume

845

First Page

499

Last Page

519

DOI

10.1017/jfm.2018.259

Abstract

Turbulent wall-bounded flows exhibit a wide range of regimes with significant interaction between scales. The fluid dynamics associated with single-phase channel flows is predominantly characterized by the Reynolds number. Meanwhile, vastly different behaviour exists in particle-laden channel flows, even at a fixed Reynolds number. Vertical turbulent channel flows seeded with a low concentration of inertial particles are known to exhibit segregation in the particle distribution without significant modification to the underlying turbulent kinetic energy (TKE). At moderate (but still low) concentrations, enhancement or attenuation of fluid-phase TKE results from increased dissipation and wakes past individual particles. Recent studies have shown that denser suspensions significantly alter the two-phase dynamics, where the majority of TKE is generated by interphase coupling (i.e. drag) between the carrier gas and clusters of particles that fall near the channel wall. In the present study, a series of simulations of vertical particle-laden channel flows with increasing mass loading is conducted to analyse the transition from the dilute limit where classical mean-shear production is primarily responsible for generating fluid-phase TKE to high-mass-loading suspensions dominated by drag production. Eulerian–Lagrangian simulations are performed for a wide range of particle loadings at two values of the Stokes number, and the corresponding two-phase energy balances are reported to identify the mechanisms responsible for the observed transition.

Comments

This is a manuscript of an article published as Capecelatro, Jesse, Olivier Desjardins, and Rodney O. Fox. "On the transition between turbulence regimes in particle-laden channel flows." Journal of Fluid Mechanics 845 (2018): 499-519. DOI: 10.1017/jfm.2018.259. Posted with permission.

Copyright Owner

Cambridge University Press

Language

en

File Format

application/pdf

Available for download on Tuesday, June 25, 2019

Published Version

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