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Open Access item Continuum description of finite-size particles advected by external flows. The effect of collisions.
|Keywords:||Chaotic Dynamics, [PACS] Chaos, [PACS] Granular flow: mixing, segregation and stratification|
|Publisher:||American Physical Society|
|Citation:||Physical Review E 69, 046306 (1-6) (2004)|
|Abstract:||The 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.|
|Description:||6 pages, 2 figures.-- PACS nrs.: 47.52.1j, 45.70.Mg.-- Pre-print version available at ArXiv: http://arxiv.org/abs/nlin/0307012.|
|Publisher version (URL):||http://dx.doi.org/10.1103/PhysRevE.69.046306|
|Appears in Collections:||(IFISC) Artículos|
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