Recurrent clogging and density waves in granular material flowing through a narrow pipe

@article{Poeschel1992RecurrentCA,
  title={Recurrent clogging and density waves in granular material flowing through a narrow pipe},
  author={Thorsten Poeschel},
  journal={Journal De Physique I},
  year={1992},
  volume={4},
  pages={499-506}
}
  • T. Poeschel
  • Published 3 December 1992
  • Materials Science, Physics
  • Journal De Physique I
We report on density waves in granular material, investigated both experimentally and numerically. When granular material falls through a long narrow pipe one observes recurrent clogging. The kinetic energy of the falling particles increases up to a characteristic threshold corresponding to the onset of recurrent clogging and density waves of no definite wavelength. The distances between regions of high density depend strongly on the initial conditions. They vary irregularly without any… 

Figures from this paper

1/ F Noise in Pipe Flow
We have investigated experimentally density fluctuations of granular flows through a vertical glass pipe filled with liquid. By changing the packing fraction of the granular material (metallic
Density waves in gravity-driven granular flow through a channel
A molecular-dynamic computer simulation is used to examine rapid granular flow in a vertical channel. A two-dimensional event driven algorithm is used with periodic boundary conditions in the flow
Jamming Patterns and Blockade Statistics in Model Granular Flows
We report experimental results on two model granular media submitted to gravity flows, i.e., a bidimensional hopper and a vertical column. For the hopper, the statistics of the flow blockade is
Langevin equation approach to granular flow in a narrow pipe
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
Linear stability analysis of rapid granular flow down a slope and density wave formation
The linear stability of rapid granular flow down a slope under gravity to the longitudinal perturbations is analysed using hydrodynamic equations. It is demonstrated that the steady flow uniform
Intermittent gravity-driven flow of grains through narrow pipes
Grain flows through pipes are frequently found in various settings, such as in pharmaceutical, chemical, petroleum, mining and food industries. In the case of size-constrained gravitational flows,
Powder flow down a vertical pipe: the effect of air flow
The dynamics of dry granular flows down a vertical glass pipe of small diameter have been studied experimentally. Simultaneous measurements of pressure profiles, air and grain flow rates and volume
Simulating granular media on the computer
Granular materials, like sand or powder, can present very intriguing effects. When shaken, sheared or poured they show segregation, convection and spontaneous fluctuations in densities and stresses.
Granular Media: Some New Results
Granular materials consist of a large collection of grains, like sand or powder. They can present very intriguing effects. When shaken, sheared or poured they show segregation, convection and
Modeling granular media on the computer
Granular materials, like sand, powder or grains present intriguing phenomena. Vibration and shearing can lead to convective motion and segregation. A variation of stress may cause localization
...
1
2
3
...