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Article Dans Une Revue Physical Review Fluids Année : 2022

Fall of a large sphere in a suspension of small fluidized particles

Ahmad Amin
Laurence Girolami

Résumé

The investigation of the fall of a sphere at finite Reynolds number in a concentrated suspension of small fluidized particles leads to unexpected results. By analyzing the drag force, it is shown that the average surface stress on the sphere is independent of the size of the sphere. It is proportional to an effective viscosity determined from the sedimentation velocity of the particles multiplied by the velocity of the sphere and divided by the size of the particles. These results question the role of concentration inhomogeneities that occur on a large scale in the overall flow around a moving obstacle and on a small scale near its surface.
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Dates et versions

hal-03750976 , version 1 (13-08-2022)

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Ahmad Amin, Laurence Girolami, Frédéric Risso. Fall of a large sphere in a suspension of small fluidized particles. Physical Review Fluids, 2022, 7 (8), pp.L082301. ⟨10.1103/PhysRevFluids.7.L082301⟩. ⟨hal-03750976⟩
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