Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2011-04-18
Physics
Condensed Matter
Soft Condensed Matter
4 pages, 4 figures, submitted to Phys. Rev. Lett. (2011)
Scientific paper
We investigate the effective long-range interactions between intruder particles immersed in a randomly driven granular fluid. The effective force $F$ between two intruders, induced by the fluctuations of the hydrodynamic fields, is attractive when the volume fraction of the granular fluid $\phi$ is sufficiently high. However, a crossover from attraction to repulsion occurs as $\phi$ decreases. This behavior is explained by competing dynamical effects, resulting in a non-uniform collision distribution around the intruders. We present the phase diagram of the transition with three control parameters: the volume fraction $\phi$, the distance between the intruders $D$, and the restitution coefficient $\alpha$. Our results reveal that $F$ is proportional to the steady-state temperature and grows logarithmically with increasing the system size in two dimensions. Moreover, by increasing the number of intruders, we verify that the fluctuation-induced interaction is not derived from a pair-potential. These results shed new light on the mechanisms of segregation in granular media.
Sarabadani Jalal
Shaebani Reza M.
Wolf Dietrich E.
No associations
LandOfFree
Transition from Attractive to Repulsive Casimir-Like Forces in Granular Media does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transition from Attractive to Repulsive Casimir-Like Forces in Granular Media, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transition from Attractive to Repulsive Casimir-Like Forces in Granular Media will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-72362