A New Granular Column Collapse Device to Characterise Flowability of Bulk Materials

Column collapse of granular rods.

We investigate the collapse of granular rodpiles as a function of particle (length/diameter) and pile (height/radius) aspect ratio. We find that, for all particle aspect ratios below 24, there exists a critical height Hl below which the pile never collapses, maintaining its initial shape as a solid, and a second height Hu above which the pile always collapses. Intermediate heights between Hl an...

Bulk Density of Granular Materials During Processing

Bulk density is an important process parameter for machines that transport, feed or process granular materials. Certain process variables have been shown to increase bulk density, such as the channel geometry at machines with rotational helical elements, the shape, dimensions and dimension distribution of granules, pressure, temperature, and vibration of the granular layer. The effect of the ra...

Viscoplastic modeling of granular column collapse with pressure-dependent rheology

http://dx.doi.org/10.1016/j.jnnfm.2015.02.006 0377-0257/ 2015 Elsevier B.V. All rights reserved. ⇑ Corresponding author at: LSPM, University Paris-Nord, Sorbonne-Paris-Cité, France. E-mail addresses: [email protected] (I.R. Ionescu), [email protected] (A. Mangeney), [email protected] (F. Bouchut), O.Roche@opgc. univ-bpclermont.fr (O. Roche). Ioan R. Ionescu a,b,⇑, Anne Mangeney , ...

Recurrent inflation and collapse in horizontally shaken granular materials.

We report a striking effect observed experimentally in several granular materials when shaken horizontally: The material displays a recurrent alternation between a slow inflation phase, characterized by an increase in its volume, and a fast collapse phase, when the volume abruptly returns to its original value. The frequency of such phase alternations is totally decoupled from the frequency of ...

Collapse Study of a Pair Thin-Walled Prismatic Column Subjected to Oblique Loads