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Flows of cohesive granular media
- Source :
- EPJ Web of Conferences, Vol 249, p 01001 (2021)
- Publication Year :
- 2021
- Publisher :
- EDP Sciences, 2021.
-
Abstract
- Cohesive granular media have broad applications in industries. However, our understanding of their flow behavior is still limited compared to dry granular media, although rich knowledge about their static and plastic properties has been gained. In this paper, we provide some insights into the flow behavior of cohesive granular media from our recent numerical studies using an inclined plane and a plane shear cell. We evidence that the cohesive nature of flows is significantly affected by material properties of the particles like stiffness and inelasticity in addition to the inter-particle adhesion and introduce the concept of “effective” adhesion, which incorporates the effects of these three variables. We propose constitutive relations involving dimensionless inertial number and “effective” cohesion number, based on the “effective” adhesion to describe the rheology. We also show that increasing adhesion increases the hysteresis in granular media, evidencing the existence of a prominent shear weakening branch in the friction coefficientversusinertial number rheological curve. Moreover, we reveal that this increasing hysteresis gives rise to the increasing occurrence of shear banding instability, pointing to the increasing possibility of jamming in cohesive granular media. Finally, we present a promising experimental approach to investigate the flow behavior of cohesive granular materials, based on a simple method of preparing a long time stable medium with a controlled adhesion between particles.
- Subjects :
- business.product_category
Materials science
Physics
QC1-999
Jamming
Adhesion
Mechanics
Granular material
01 natural sciences
Quantitative Biology::Cell Behavior
010305 fluids & plasmas
Condensed Matter::Soft Condensed Matter
Shear (sheet metal)
Rheology
0103 physical sciences
Cohesion (chemistry)
Inclined plane
010306 general physics
business
Material properties
Subjects
Details
- ISSN :
- 2100014X
- Volume :
- 249
- Database :
- OpenAIRE
- Journal :
- EPJ Web of Conferences
- Accession number :
- edsair.doi.dedup.....dd91006b826b1e7e8f396fdbfe17b4f5
- Full Text :
- https://doi.org/10.1051/epjconf/202124901001