Statistical characterization of the forces on spheres in an upflow of air

Details Statistical characterization of the forces on spheres in an upflow of air Statistical characterization of the forces on spheres in an upflow of air

2004-06-30

arxiv.org/abs/cond-mat/0406742v2

Phys. Rev. E 71, 016313 (2005)

Physics

Condensed Matter

Statistical Mechanics

7 pages, experiment

Scientific paper

10.1103/PhysRevE.71.016313

The dynamics of a sphere fluidized in a nearly-levitating upflow of air were previously found to be identical to those of a Brownian particle in a two-dimensional harmonic trap, consistent with a Langevin equation [Ojha {\it et al.}, Nature {\bf 427}, 521 (2004)]. The random forcing, the drag, and the trapping potential represent different aspects of the interaction of the sphere with the air flow. In this paper we vary the experimental conditions for a single sphere, and report on how the force terms in the Langevin equation scale with air flow speed, sphere radius, sphere density, and system size. We also report on the effective interaction potential between two spheres in an upflow of air.

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