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Communication Dans Un Congrès Année : 2021

Taming the Janssen effect

Résumé

We investigate both experimentally and theoretically the apparent mass of a ferromagnetic granular assembly filling a cylindrical container and submitted to a magnetic field B, aligned vertically along the silo. We show that the mass of the ferromagnetic granular column depends strongly on the applied magnetic field. Notably, our measurements deviate strongly from the exponential saturation of the measured mass as a function of the true mass of the grain packing, as predicted by Janssen [H.A. Janssen, Vereins Eutscher Ingenieure Zeitschrift, 1045 (1895)]. In particular, the measured mass of tall columns decreases systematically as the amplitude of the magnetic field increases. We rationalize our experimental findings by considering the induced magnetic dipole-dipole interactions within the whole packing. We show the emergence of a global magnetic radial force along the walls of the silos, fully determined by the external magnetic field. The resulting tunable frictional interactions allows a full control of the effective mass of the ferromagnetic granular column.
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Dates et versions

hal-03290170 , version 1 (19-07-2021)

Licence

Domaine public

Identifiants

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Louison Thorens, Knut Jørgen Måløy, Mickaël Bourgoin, Stéphane Santucci. Taming the Janssen effect. Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media, Jul 2021, Buenos Aires (Virtual), Argentina. pp.08004, ⟨10.1051/epjconf/202124908004⟩. ⟨hal-03290170⟩

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