Influence of fine particles on the stability of a humid granular pile

Xixi Huang (1, 2) , Sandrine Bec (1) , Jean Colombani (2)

1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
2 ILM - Institut Lumière Matière [Villeurbanne]

We have investigated by rotating drum experiments the influence of a small amount of fine particles on the stability of a granular heap. The fine particles are shown to have a strong and ambivalent influence. For low fine particle content, the heap destabilizes by avalanches, and the fine particles tend to fluidize the heap. In contrast, for high fine particle content, they increase the cohesion of the heap, which destabilizes through stick-slip at the drum wall. We interpret and model the fluidification in the avalanching regime, which we show is independent of humidity, by granular lubrication considerations, whereas the stick-slip behavior, highly dependent on humidity, is understood by a solid friction model.

Mots clés: granular matter; rotating drum; granular lubrication; jamming; stability

Domaines: Mécanique statistique [cond-mat.stat-mech]; Matière Molle [cond-mat.soft]; Science des matériaux [cond-mat.mtrl-sci]

Xixi Huang, Sandrine Bec, Jean Colombani. Influence of fine particles on the stability of a humid granular pile. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2014, 90, pp.052201. ⟨10.1103/PhysRevE.90.052201⟩. ⟨hal-01084662⟩