AustralieFrV1, Main, Exploration, bibRecord, 008C17

Liquid distribution and cohesion in wet granular assemblies beyond the capillary bridge regime

Identifieur interne : 008C17 ( Main/Exploration ); précédent : 008C16; suivant : 008C18

Liquid distribution and cohesion in wet granular assemblies beyond the capillary bridge regime

Auteurs : M. Scheel [Allemagne] ; R. Seemann [Allemagne] ; M. Brinkmann [Allemagne] ; M. Di Michiel [France] ; A. Sheppard [Australie] ; S. Herminghaus [Allemagne]

Source :

Journal of physics. Condensed matter : (Print) [ 0953-8984 ] ; 2008.

RBID : Pascal:09-0251271

Descripteurs français

Pascal (Inist)
- Interface, Tension superficielle, Structure granulaire, Résistance traction, Rigidité, Propriété mécanique, Distribution aléatoire, Mode empilement, Fluidisation, Eau, Capillarité.
Wicri :
- topic : Eau.

English descriptors

KwdEn :
- Capillarity, Fluidization, Granular structure, Interfaces, Mechanical properties, Random distribution, Stacking sequence, Stiffness, Surface tension, Tensile strength, Water.

Abstract

Dry sand turns into a stiff and moldable material as soon as it is mixed with some liquid. This is a direct consequence of the internal liquid-air interfaces spanning between the grains which causes capillary cohesion by virtue of the surface tension of the liquid. As a model for wet granulates we investigated random packings of submillimeter spherical beads mixed with water. Measurements of the tensile strength and the fluidization threshold demonstrate that the mechanical stiffness is rather insensitive to the liquid content over a wide range. Only for a high liquid content, when more than half of the available pore space is filled with liquid, does the capillary cohesion weaken. In order to understand the interplay between the mechanical properties and the liquid content, we investigated the liquid distribution in random packings of glass spheres by means of x-ray microtomography. The three-dimensional images reveal that the liquid forms a network of capillary bridges fused at local triangular bead configurations. The spontaneous organization of the liquid into these ramified structures, which exhibit a large liquid-air interface, is responsible for the constancy of the cohesive forces in a wide range of liquid contents beyond the onset of capillary bridge coalescence.

Affiliations:

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Le document en format XML

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<term>Propriété mécanique</term>
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<front><div type="abstract" xml:lang="en">Dry sand turns into a stiff and moldable material as soon as it is mixed with some liquid. This is a direct consequence of the internal liquid-air interfaces spanning between the grains which causes capillary cohesion by virtue of the surface tension of the liquid. As a model for wet granulates we investigated random packings of submillimeter spherical beads mixed with water. Measurements of the tensile strength and the fluidization threshold demonstrate that the mechanical stiffness is rather insensitive to the liquid content over a wide range. Only for a high liquid content, when more than half of the available pore space is filled with liquid, does the capillary cohesion weaken. In order to understand the interplay between the mechanical properties and the liquid content, we investigated the liquid distribution in random packings of glass spheres by means of x-ray microtomography. The three-dimensional images reveal that the liquid forms a network of capillary bridges fused at local triangular bead configurations. The spontaneous organization of the liquid into these ramified structures, which exhibit a large liquid-air interface, is responsible for the constancy of the cohesive forces in a wide range of liquid contents beyond the onset of capillary bridge coalescence.</div>
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Liquid distribution and cohesion in wet granular assemblies beyond the capillary bridge regime

Liquid distribution and cohesion in wet granular assemblies beyond the capillary bridge regime

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri