Dilatancy in slow granular flows

Date

2009-06-03

Authors

Kabla, Alexandre J
Senden, Timothy

Journal Title

Journal ISSN

Volume Title

Publisher

American Physical Society

Abstract

When walking on wet sand, each footstep leaves behind a temporarily dry impression. This counterintuitive observation is the most common illustration of the Reynolds principle of dilatancy: that is, a granular packing tends to expand as it is deformed, therefore increasing the amount of porous space. Although widely called upon in areas such as soil mechanics and geotechnics, a deeper understanding of this principle is constrained by the lack of analytical tools to study this behavior. Using x-ray radiography, we track a broad variety of granular flow profiles and quantify their intrinsic dilatancy behavior. These measurements frame Reynolds dilatancy as a kinematic process. Closer inspection demonstrates, however, the practical importance of flow induced compaction which competes with dilatancy, leading more complex flow properties than expected.

Description

Keywords

Keywords: Analytical tool; Complex flow properties; Flow induced; Geotechnics; Granular flows; Granular Packings; Porous space; Practical importance; Reynolds; Confined flow; Granular materials; Soil mechanics; X ray radiography

Citation

Physical Review Letters 102.22 (2009): 228301/1-4

Source

Physical Review Letters

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1103/PhysRevLett.102.228301

Restricted until