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Flow of magnetized grains in a rotating drum

G. Lumay1,2 and N. Vandewalle1

  • 1GRASP, Université de Liège, B-4000 Liège, Belgium
  • 2F.R.S.-FRNS, B-1000 Bruxelles, Belgium

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Phys. Rev. E 82, 040301(R) – Published 21 October, 2010

DOI: https://doi.org/10.1103/PhysRevE.82.040301

Abstract

We have experimentally investigated the influence of a magnetic interaction between the grains on the flow of a granular material in a rotating drum. The magnetic cohesion is induced by applying a homogeneous external magnetic field B⃗ oriented either parallel or perpendicular to the gravity g⃗. The drum rotating speed has been selected to obtain a continuous flow when the magnetic field is switched off. We show that, for both magnetic field orientations, the cohesion is able to induce a transition between the continuous flow regime to the discrete avalanche regime. The avalanche dynamics is periodic when B⃗⊥g⃗ and irregular when B⃗∥g⃗. Moreover, the maximal angle of stability θm increases strongly with the cohesion strength and could be higher than 90° when B⃗⊥g⃗. A toy model based on the stability of a magnetic block on a magnetic inclined plane is proposed to explain this behavior.

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Phys. Rev. E 82, 040301(R)– Published 21 October, 2010
  • Received 16 July 2010

© 2010 American Physical Society

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