Dynamic self-organization in particle-laden channel flow

Bernardus J. Geurts, A.W. Vreman

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    6 Citations (Scopus)

    Abstract

    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.
    Original languageUndefined
    Article number10.1016/j.ijheatfluidflow.2006.03.025
    Pages (from-to)945-954
    Number of pages10
    JournalInternational journal of heat and fluid flow
    Volume27
    Issue number11/5
    DOIs
    Publication statusPublished - 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

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