Langevin equation approach to granular flows in narrow pipes

TL;DR

This paper models granular flow in narrow pipes using Langevin equations, capturing phenomena like clogging and density waves observed experimentally.

Contribution

It introduces a Langevin equation framework to describe granular flow in narrow pipes, accounting for wall interactions and resulting flow phenomena.

Findings

Clogging behavior observed in simulations

Density waves form in the flow

Model aligns with experimental observations

Abstract

The flow of granular material through a rough narrow pipe is described by the Langevin equation formalism. The stochastic force is caused by irregular interaction between the wall and the granular particles. In correspondence with experimental observations we find clogging and density waves in the flowing material.