Abstract
We present experimental observations of the spatial distribution of large inertial particles suspended in a turbulent swirling flow at high Reynolds number. The plastic particles are heavier than the working fluid so that their dynamics results from a competition between gravitation and turbulent agitation. Two suspension regimes are observed. At low rotation rate particles are confined near the bottom for any size or density. At high rotation rate, particles are loosely confined: small particles are nearly homogeneously distributed and large ones found near the top as if gravity was reversed. We discuss these observations using a minimal random walk model accounting for particle inertia.
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