Reference : How relative humidity affects random packing experiments
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/117604
How relative humidity affects random packing experiments
English
Vandewalle, Nicolas mailto [Université de Liège - ULg > Département de physique > Physique statistique >]
Lumay, Geoffroy mailto [Université de Liège - ULg > Département de physique > Physique statistique >]
Ludewig, François mailto [Université de Liège - ULg > Département de physique > Physique statistique >]
Fiscina, Jorgue Eduardo [ > > ]
2012
Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics
American Physical Society
85
031309
Yes (verified by ORBi)
International
1539-3755
1550-2376
College Park
MD
[en] humidity ; granular material ; compaction
[en] The influence of relative humidity (RH) on the extremely slow compaction dynamics of a granular assembly has been experimentally investigated. Millimeter-sized glass beads are considered. Compaction curves are fitted by stretched exponentials with characteristic time τ and exponent δ, which are seen to be deeply affected by the moisture content. A kinetic model, taking into account both triboelectric and capillary effects, is in excellent agreement with our results. It confirms the existence of an optimal condition at a relative humidity ≈45% for minimizing cohesive interactions between glass beads. The exponent δ is seen to depend strongly on the diffusive character of grains and voids inside the packing: diffusion for cohesiveless particles and subdiffusion when cohesion plays a role. As a consequence, the RH represents a relevant parameter that should be reported for every experimental work on a slowly driven dense random packing.
Researchers ; Professionals
http://hdl.handle.net/2268/117604

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