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Название: Langevin Equation Approach to Granular Flow in a Narrow Pipe
Автор: Schimansky-Geier L.
The gravity-driven flow of granular material through a rough, narrow vertical pipe is described using the Langevin equation formalism. Above a critical particle density the homogeneous flow becomes unstable with respect to short-wave length perturbations. In correspondence with experimental observations, we find clogging and density waves in the flowing material.