Role of driving force on the clogging of inert particles in a bottleneck

Arévalo, Roberto; Zuriguel, Iker; Maza, Diego; Garcimartín, Ángel

doi:10.1103/physreve.89.042205

Cited by 32 publications

(32 citation statements)

References 38 publications

(42 reference statements)

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“…Although there is a considerable debate on the maximum possible width of the outlet [23][24][25][26][27] in the literature, these observed data is comparable with experimental results obtained by Guo and Zhou [17] for granular materials e.g., glass beads (with d50=5.5 mm) and dense sand on the base angle of 30 o . …”

Section: Experimental Observationssupporting

confidence: 80%

An Experimental Investigation on the Generation of a Stable Arch in Granular Materials Using a Developed Trapdoor Apparatus

Ahmadi

Hosseininia

2017

EPJ Web Conf.

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Abstract. This paper discusses the formation of stable arches in granular materials by using a series of laboratory tests. To this aim, a developed trapdoor apparatus is designed to find dimensions of arches formed over the door in cohesionless aggregates. This setup has two new important applications. In order to investigate the maximum width of the opening generated exactly on the verge of failure, the door can be open to an arbitrary size. In addition, the box containing granular materials (or base angle) is able to be set on optional angles from zero to 90 degrees with respect to the horizontal. Therefore, it is possible to understand the effect of different levels of gravity accelerations on the formed arches. It is observed that for all tested granular materials, increasing the door size and decreasing the base angle, both cause to increase the width and height of the arch. Moreover, the shape of all arches is governed by a parabola. Furthermore, the maximum door width is approximately five to 8.6 times the particle size, depending on the internal friction angle of materials and the base angle.

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Section: Experimental Observationssupporting

confidence: 80%

An Experimental Investigation on the Generation of a Stable Arch in Granular Materials Using a Developed Trapdoor Apparatus

Ahmadi

Hosseininia

2017

EPJ Web Conf.

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“…This √ 2gR scaling of the central velocity has been both experimentally [18] and numerically [19] demonstrated in recent times. Traditionally, it was related to the concept of the free fall arch, which suggests the existence of a hypothetical hemispheric [1] or parabolic [20] region proportional to R, just over the outlet, where the flow properties undergo a transition.…”

Section: Introductionmentioning

confidence: 54%

Role of particle size in the kinematic properties of silo flow

2017

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We experimentally analyze the effect that particle size has on the mass flow rate of a quasi two-dimensional silo discharged by gravity. In a previous work, Janda et al. [Phys. Rev. Lett. 108, 248001 (2012)] introduced a new expression for the mass flow rate based on a detailed experimental analysis of the flow for 1-mm diameter beads. Here, we aim to extend these results by using particles of larger sizes and a variable that was not explicitly included in the proposed expression. We show that the velocity and density profiles at the outlet are self-similar and scale with the outlet size with the same functionalities as in the case of 1-mm particles. Nevertheless, some discrepancies are evidenced in the values of the fitting parameters. In particular, we observe that larger particles lead to higher velocities and lower packing fractions at the orifice. Intriguingly, both magnitudes seem to compensate giving rise to very similar flow rates. In order to shed light on the origin of this behavior we have computed fields of a solid fraction, velocity, and a kinetic-stress like variable in the region above the orifice.

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“…It is worth noting that all these conditions are important in order to find the FIS effect. For example, in the silo under different gravities described in [35,36], FIS is not observed because condition (d) is not fulfilled. Therefore, clogs are not resumed and only the scenario of faster-is-faster is achieved.…”

Section: Discussionmentioning

confidence: 99%

Experimental proof of faster-is-slower in systems of frictional particles flowing through constrictions

et al. 2015

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The "faster-is-slower" (FIS) effect was first predicted by computer simulations of the egress of pedestrians through a narrow exit [D. Helbing, I. J. Farkas, and T. Vicsek, Nature (London) 407, 487 (2000)]. FIS refers to the finding that, under certain conditions, an excess of the individuals' vigor in the attempt to exit causes a decrease in the flow rate. In general, this effect is identified by the appearance of a minimum when plotting the total evacuation time of a crowd as a function of the pedestrian desired velocity. Here, we experimentally show that the FIS effect indeed occurs in three different systems of discrete particles flowing through a constriction: (a) humans evacuating a room, (b) a herd of sheep entering a barn, and (c) grains flowing out a 2D hopper over a vibrated incline. This finding suggests that FIS is a universal phenomenon for active matter passing through a narrowing.

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Role of driving force on the clogging of inert particles in a bottleneck

Cited by 32 publications

References 38 publications

An Experimental Investigation on the Generation of a Stable Arch in Granular Materials Using a Developed Trapdoor Apparatus

An Experimental Investigation on the Generation of a Stable Arch in Granular Materials Using a Developed Trapdoor Apparatus

Role of particle size in the kinematic properties of silo flow

Experimental proof of faster-is-slower in systems of frictional particles flowing through constrictions

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