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Título

Continuum description of finite-size particles advected by external flows. The effect of collisions.

Autor López, Cristóbal ; Puglisi, Andrea
Palabras clave Chaotic Dynamics
[PACS] Chaos
[PACS] Granular flow: mixing, segregation and stratification
Fecha de publicación 28-abr-2004
EditorAmerican Physical Society
Citación Physical Review E 69, 046306 (1-6) (2004)
ResumenThe equation of the density field of an assembly of macroscopic particles advected by an external flow is derived from the microscopic description of the system. This equation allows to recognize the role and the relative importance of the different microscopic processes implicit in the model: the driving of the external flow, the inertia of the particles, and the collisions among them. The validity of the density description is confirmed by comparisons of numerical studies of the continuum equation with Direct Simulation Monte Carlo (DSMC) simulations of hard disks advected by a chaotic flow. We show that the collisions have two competing roles: a dispersing-like effect and a clustering effect (even for elastic collisions). An unexpected feature is also observed in the system: the presence of collisions can reverse the effect of inertia, so that grains with lower inertia are more clusterized.
Descripción 6 pages, 2 figures.-- PACS nrs.: 47.52.1j, 45.70.Mg.-- Pre-print version available at ArXiv: http://arxiv.org/abs/nlin/0307012.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevE.69.046306
URI http://hdl.handle.net/10261/7474
DOI10.1103/PhysRevE.69.046306
ISSN1539-3755
Aparece en las colecciones: (IFISC) Artículos
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