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Journal Articles Energies Year : 2023

Preferential concentration of particles in forced turbulent flows: Effects of gravity

Abstract

The impact of gravity on the particle preferential concentration is investigated by direct numerical simulations in an Eulerian–Lagrangian framework for a large range of Stokes numbers St$_\eta$=0.01∼4. For particles with small Stokes numbers such as Stη=0.01, the gravity has minor effects on the particle spatial distribution in the turbulence. With increasing Stη, stripped structures of the high number density of particles appear and expand along the gravity direction. Different evaluation methods of particle preferential concentration are discussed such as the spatial distribution, the box index, and the probability density function. The number density of particles in the accumulating regions reduced under the influence of gravity. The reduction becomes prominent for the particle cloud at Stokes number St$_\eta$≈1, especially in the clusters of high particle number density. For large Stokes number Stη, the slip velocity significantly increases due to the particle gravity. Due to the gravity, the particle concentration reduces globally, particularly in the low vorticity regions. For the Stokes number range explored in this paper, gravity has a considerable impact on the particle-turbulence interaction.
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cea-04412325 , version 1 (29-05-2024)

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Guodong Gai, Olivier Thomine, Abdellah Hadjadj, Sergey Kudriakov, Anthony Wachs. Preferential concentration of particles in forced turbulent flows: Effects of gravity. Energies, 2023, 16 (6), pp.2910. ⟨10.3390/en16062910⟩. ⟨cea-04412325⟩
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