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Article Dans Une Revue Physical Review E Année : 2020

Sedimentation of a suspension of paramagnetic particles in an external magnetic field

Résumé

We investigate the sedimentation of initially packed paramagnetic particles in the presence of a homogeneous external magnetic field, in a Hele-Shaw cell filled with water. Although the magnetic susceptibility of the particles is small and the particle-particle induced magnetic interactions are significantly smaller compared to the gravitational acceleration, we do observe a measurable reduction of the decompaction rate as the amplitude of the applied magnetic field is increased. While induced magnetic dipole-dipole interactions between particles can be either attractive or repulsive depending on the particles relative alignment, our observations reveal an effective overall enhancement of the cohesion of the initial pack of particles due to the induced interactions, very likely promoting internal chain forces in the initial pack of particles. The influence of the magnetic field on the particles once they disperse after being decompacted is on the other hand found to remain marginal.
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Dates et versions

hal-02929144 , version 1 (12-10-2020)

Identifiants

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Jérémy Vessaire, Nicolas Plihon, Romain Volk, Mickaël Bourgoin. Sedimentation of a suspension of paramagnetic particles in an external magnetic field. Physical Review E , 2020, 102 (2), pp.023101. ⟨10.1103/PhysRevE.102.023101⟩. ⟨hal-02929144⟩
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