Grain Motion Under Air Flow

Becco, Christophe; Caps, Hervé; Dorbolo, Stéphane; Bodson, C.; Vandewalle, Nicolas

doi:10.1007/3-540-28091-x_55

Cited by 1 publication

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous simulations of granular pipe flow have also reported density waves [6,[29][30][31][32][33][34]. Several mechanisms for velocity dissipation through inelastic collisions, damping and static friction have been employed, see, e.g., [35].…”

Section: Introductionmentioning

confidence: 99%

Model for density waves in gravity-driven granular flow in narrow pipes

et al. 2010

View full text Add to dashboard Cite

A gravity-driven flow of grains through a narrow pipe in vacuum is studied by means of a onedimensional model with two coefficients of restitution. Numerical simulations show clearly how density waves form when a strikingly simple criterion is fulfilled: that dissipation due to collisions between the grains and the walls of the pipe is greater per collision than that which stems from collisions between particles. Counterintuitively, the highest flow rate is observed when the number of grains per density wave grows large. We find strong indication that the number of grains per density wave always approaches a constant as the particle number tends to infinity, and that collapse to a single wave, which was often observed also in previous simulations, occurs because the number of grains is insufficient for multiple wave formation.

show abstract