Role of flying buttresses in the jamming of granular matter through multiple rectangular outlets

Mondal, Somnath; Sharma, Mukul M.

doi:10.1007/s10035-013-0461-5

Cited by 20 publications

(12 citation statements)

References 32 publications

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“…In recent times, this multi-opening case has been examined and it was found that the positioning of two openings can significantly change jamming dynamics in a silo. In particular, it was found in discrete element modelling (DEM) simulations that the presence of a second nearby opening allowed spontaneous jamming and unjamming of an orifice, and the probability of jamming decreased as the openings were moved closer together [33,34]. Furthermore, DEM experiments were carried out to show how mixing could be controlled in a silo with multiple openings.…”

Section: Introductionmentioning

confidence: 99%

The dynamics of granular flow from a silo with two symmetric openings

et al. 2019

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The dynamics of granular flow in a rectangular silo with two symmetrically placed exit openings is investigated using particle image velocimetry (PIV), flow rate measurements and discrete element modelling (DEM). The flow of mustard seeds in a Perspex silo is recorded using a high-speed camera and the resulting image frames are analysed using PIV to obtain velocity, velocity divergence and shear rate plots. A change in flow structure is observed as the distance L between the two openings is varied. The mass flow rate is shown to be at a maximum at zero opening separation, decreasing as L is increased; it then reaches a minimum before rising to an equilibrium rate close to two times that of an isolated (non-interacting) opening. The flow rate experiment is repeated using amaranth and screened sand and similar behaviour is observed. Although this result is in contrast with some recent DEM and physical experiments in silo systems, this effect has been reported in an analogous system: the evacuation of pedestrians from a room through two doors. Our experimental results are replicated using DEM and we show that inter-particle friction controls the flow rate behaviour and explains the discrepancies in the literature results.

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Section: Introductionmentioning

confidence: 99%

The dynamics of granular flow from a silo with two symmetric openings

et al. 2019

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“…This behavior-which has also been explained by a simple model [8]-seems very robust. Indeed, deviations from it have only been found when anisotropy is introduced in the particles [4] or in the outlet geometry [9,10]. From the exponential decay of the avalanche size, the average can be calculated and used to investigate whether or not there exists a critical outlet size above which clogging will never occur.…”

Section: Introductionmentioning

confidence: 99%

Stability of clogging arches in a silo submitted to vertical vibrations

2015

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We present experimental results on the endurance of arches that block the outlet of a two-dimensional silo when subjected to vertical vibration. In a recent paper [C. Lozano et al., Phys. Rev. Lett. 109, 068001 (2012)], it was shown that the arch resistance against vibrations is determined by the maximum angle among those formed between each particle in the bridge and its two neighbors: the larger the maximum angle is, the weaker the bridge. It has also been reported that the breaking time distribution shows a power-law tail with an exponent that depends on the outlet size, the vibration intensity, and the load [I. Zuriguel et al., Sci. Rep. 4, 7324 (2014)]. Here we connect these previous works, demonstrating the importance of the maximum angle in the arch on the exponent of the breaking time distribution. Besides, we find that the acceleration needed to break an arch does not depend on the ramp rate of the applied acceleration, but it does depend on the outlet size above which the arch is formed. We also show that high frequencies of vibration reveal a change in the behavior of the arches that endure very long times. These arches have been identified as a subset with special geometrical features. Therefore, arches that cannot be broken by means of a given external excitation might exist.

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“…Paradoxically, the situation is much more complex than expected and, despite the numerous efforts devoted to unveil if there is a transition from clogged to unclogged regimes, there is not a robust and definitive answer yet. At this time, it has been shown that both the avalanche duration and the avalanche size distributions display an exponential tail analogous to the flowing times interval distribution observed in the vibrated silo [23][24][25][26][27][28][29][30][31][32][33][34][35]. This exponential tail, which extends to other systems such as fluid driven particle flow [36,37] has been explained in terms of the existence of a constant probability of clogging [28,38,39].…”

Section: The Static Silo As a Special Casementioning

confidence: 92%

Clogging and unclogging of many-particle systems passing through a bottleneck

Zuriguel

Janda²,

Arévalo

et al. 2017

EPJ Web Conf.

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When a group of discrete particles pass through a narrowing, the flow may become arrested due to the development of structures that span over the size of the aperture. Then, it is said that the system is clogged. Here, we will discuss about the existence of a phase diagram for the clogged state that has been recently proposed, arguing on its usefulness to describe different systems of discrete bodies ranging from granular materials, to colloidal suspensions and live beings. This diagram is built based on the value of a flowing parameter which characterizes the intermittent flow observed in all these discrete systems provided that there is an external or internal energy supply. Such requirement, which is necessary to destabilize the clogging arches, is absent in a standard static silo, which is therefore examined as a particular case. This view will help to understand some a priori inconsistencies concerning the role of driving force in the clogging process that have been found in the last years.

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Role of flying buttresses in the jamming of granular matter through multiple rectangular outlets

Cited by 20 publications

References 32 publications

The dynamics of granular flow from a silo with two symmetric openings

The dynamics of granular flow from a silo with two symmetric openings

Stability of clogging arches in a silo submitted to vertical vibrations

Clogging and unclogging of many-particle systems passing through a bottleneck

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