Universität zu Köln

D'Angelo, Olfa ORCID: 0000-0002-7218-4596, Horb, Anabelle, Cowley, Aidan, Sperl, Matthias ORCID: 0000-0001-9525-0368 and Kranz, W. Till (2022). Granular piston-probing in microgravity: powder compression, from densification to jamming. NPJ Microgravity, 8 (1). BERLIN: NATURE PORTFOLIO. ISSN 2373-8065

Full text not available from this repository.

Abstract

The macroscopic response of granular solids is determined by the microscopic fabric of force chains, which, in turn, is intimately linked to the history of the solid. To query the influence of gravity on powder flow behavior, a granular material is subjected to compression by a piston in a closed container, on-ground and in microgravity (on parabolic flights). Results show that piston-probing densifies the packing, eventually leading to jamming of the material compressed by the piston, regardless of the gravitational environment. The onset of jamming is found to appear at lower packing fraction in microgravity (phi(mu-g)(J) = 0.567 +/- 0.014) than on-ground (phi(gnd)(j) = 0.579 +/- 0.014). We interpret these findings as the manifestation of a granular fabric altered by the gravitational force field: in absence of a secondary load (due to gravitational acceleration) to stimulate reorganization in a different direction to the major compression stress, the particles' configuration becomes stable at lower density, as the particles have no external drive to promote reorganization into a denser packing. This is coupled with a change in interparticular force balance which takes place under low gravity, as cohesive interactions become predominant. We propose a combination of microscopic and continuum arguments to rationalize our results.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code D'Angelo, Olfa UNSPECIFIED orcid.org/0000-0002-7218-4596 UNSPECIFIED Horb, Anabelle UNSPECIFIED UNSPECIFIED UNSPECIFIED Cowley, Aidan UNSPECIFIED UNSPECIFIED UNSPECIFIED Sperl, Matthias UNSPECIFIED orcid.org/0000-0001-9525-0368 UNSPECIFIED Kranz, W. Till UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-681803
DOI:	10.1038/s41526-022-00235-2
Journal or Publication Title:	NPJ Microgravity
Volume:	8
Number:	1
Date:	2022
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2373-8065
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RANDOM-CLOSE PACKING; RHEOLOGY; DYNAMICS; AGGREGATION; SPHERES; MATTER Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68180