Role of vibrations in the jamming and unjamming of grains discharging from a silo

Details Role of vibrations in the jamming and unjamming of grains discharging from a silo Role of vibrations in the jamming and unjamming of grains discharging from a silo

2009-07-28

arxiv.org/abs/0907.4871v1

Phys. Rev. E 80 (2009), 011309

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.80.011309

We present experimental results of the jamming of non-cohesive particles discharged from a flat bottomed silo subjected to vertical vibration. When the exit orifice is only a few grain diameter wide, the flow can be arrested due to the formation of blocking arches. Hence, an external excitation is needed to resume the flow. The use of a continuous gentle vibration is a usual technique to ease the flow in such situations. Even though jamming is less frequent, it is still an issue in vibrated silos. There are, in principle, two possible mechanisms through which vibrations may facilitate the flow: (i) a decrease in the probability of the formation of blocking arches, and (ii) the breakage of blocking arches once they have been formed. By measuring the time intervals inside an avalanche during which no particles flow through the outlet, we are able to estimate the probability of breaking a blocking arch by vibrations. The result agrees with the prediction of a bivariate probabilistic model in which the formation of blocking arches is equally probable in vibrated and non-vibrated silos. This indicates that the second aforementioned mechanism is the main responsible for improving the flowability in gently vibrated silos.

Affiliated with

Also associated with

No associations

Rating

Role of vibrations in the jamming and unjamming of grains discharging from a silo 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 Role of vibrations in the jamming and unjamming of grains discharging from a silo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Role of vibrations in the jamming and unjamming of grains discharging from a silo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-681838