Large Force Fluctuations in a Flowing Granular Medium

Details Large Force Fluctuations in a Flowing Granular Medium Large Force Fluctuations in a Flowing Granular Medium

2002-03-19

arxiv.org/abs/cond-mat/0203379v1

Phys. Rev. Lett. 89, 045501 (2002)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.89.045501

We report the characteristics of the temporal fluctuations in the local force delivered to the wall of a 2D hopper by a granular medium flowing through it. The forces are predominantly impulsive at all flow rates for which the flow does not permanently jam. The average impulse delivered to the wall is much larger than the momentum acquired by a single particle under gravity between collisions, reflecting the fact that momentum is transferred to the walls from the bulk of the flow by collisions. At values larger than the average impulse, the probability distribution of impulses is broad and decays exponentially on the scale of the average impulse, just as it does in static granular media. At small impulse values, the probability distribution evolves continuously with flow velocity but does not show a clear signature of the transition from purely collisional flow to intermittently jamming flows. However, the time interval between collisions tends to a power law distribution, $P(\tau)\sim \tau^{-3/2}$, thus showing a clear dynamical signature of the approach to jamming.

Affiliated with

Also associated with

No associations

Rating

Large Force Fluctuations in a Flowing Granular Medium 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 Large Force Fluctuations in a Flowing Granular Medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large Force Fluctuations in a Flowing Granular Medium will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-620081