Wake-Driven Dynamics of Finite-Sized Buoyant Spheres in Turbulence

V. Mathai, V.N. Prakash, John Brons, C. Sun, D. Lohse

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    41 Citations (Scopus)
    48 Downloads (Pure)

    Abstract

    Particles suspended in turbulent flows are affected by the turbulence and at the same time act back on the flow. The resulting coupling can give rise to rich variability in their dynamics. Here we report experimental results from an investigation of finite-sized buoyant spheres in turbulence. We find that even a marginal reduction in the particle’s density from that of the fluid can result in strong modification of its dynamics. In contrast to classical spatial filtering arguments and predictions of particle models, we find that the particle acceleration variance increases with size. We trace this reversed trend back to the growing contribution from wake-induced forces, unaccounted for in current particle models in turbulence. Our findings highlight the need for improved multiphysics based models that account for particle wake effects for a faithful representation of buoyant-sphere dynamics in turbulence.
    Original languageEnglish
    Article number124501
    JournalPhysical Review Letters
    Volume115
    Issue number12
    DOIs
    Publication statusPublished - 2015

    Bibliographical note

    © 2015 American Physical Society

    Keywords

    • Buoyancy
    • Dynamics
    • Spheres
    • Wakes
    • Multi-physics
    • Particle acceleration
    • Particle model
    • Spatial filterings
    • Wake effect

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