Flow of granular matter in a silo with multiple exit orifices: Jamming to mixing

Kamath, Sandesh; Kunte, Amit; Doshi, Pankaj; Orpe, Ashish V.

doi:10.1103/physreve.90.062206

Cited by 15 publications

(6 citation statements)

References 17 publications

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“…Furthermore, DEM experiments were carried out to show how mixing could be controlled in a silo with multiple openings. It was shown that stagnant zones could be reduced and a more uniform particle distribution across the silo could be obtained when opening and closing adjacent openings at an appropriate frequency [35]. In recent experimental work [36], the velocity of particle flow in silos with two openings was mapped using particle image velocimetry (PIV) for two symmetrically and then eccentrically placed 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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“…There is a long-standing interest to better understand mobility in granular environments within both the robotics and granular physics communities. [1][2][3][4][5][6][7][8][9] This is important for new mobility and material transfer solutions, particularly in the space sector where increased mass and volume are oen costly while increased moving parts or complexity are regarded as increasing risk. This complexity is further compounded by the variety of granular materials which exist.…”

Section: Introductionmentioning

confidence: 99%

Helically-driven granular mobility and gravity-variant scaling relations

2019

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“…bubbles escaping from an orifice [22] or colloidal hard spheres flowing through a constriction [23]. As a system of practical utility, the multi-orifice hopper can be operated as an efficient mixing device [24] wherein the mixing can be initialized through interaction between different zones of an hopper through either random or controlled closing and opening of orifice.…”

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confidence: 99%

Spontaneous jamming and unjamming in a hopper with multiple exit orifices

2014

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We show that the flow of granular material inside a two-dimensional flat bottomed hopper is altered significantly by having more than one exit orifice. For hoppers with small orifice widths, intermittent flow through one orifice enables the resumption of flow through the adjacent jammed orifice, thus displaying a sequence of jamming and unjamming events. Using discrete element simulations, we show that the total amount of granular material (i.e., avalanche size) emanating from all the orifices combined can be enhanced by about an order of magnitude difference by simply adjusting the interorifice distance. The unjamming is driven primarily by fluctuations alone when the interorifice distance is large, but when the orifices are brought close enough, the fluctuations along with the mean flow cause the flow to unjam.

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Flow of granular matter in a silo with multiple exit orifices: Jamming to mixing

Cited by 15 publications

References 17 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

Helically-driven granular mobility and gravity-variant scaling relations

Spontaneous jamming and unjamming in a hopper with multiple exit orifices

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