Effect of hopper angle on granular clogging

López-Rodríguez, Diego; Gella, Diego; To, Kiwing; Maza, Diego; Garcimartín, Ángel; Zuriguel, Iker

doi:10.1103/physreve.99.032901

Cited by 35 publications

(30 citation statements)

References 32 publications

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“…Although their observation was not based on a systematic study, it is consistent with the results reported here if we consider that the constriction angle in their setup was smaller (45 • ) than the one considered here (60 • ). In a silo full of dry grains, reducing the hopper angle (with respect to the vertical direction) has been shown to decrease the clogging probability in such a quantitative way [7,29].…”

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Transition from clogging to continuous flow in constricted particle suspensions

2020

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When suspended particles are pushed by liquid flow through a constricted channel, they might either pass the bottleneck without trouble or encounter a permanent clog that will stop them forever. However, they may also flow intermittently with great sensitivity to the neck-to-particle size ratio D/d. In this Rapid Communication, we experimentally explore the limits of the intermittent regime for a dense suspension through a single bottleneck as a function of this parameter. To this end, we make use of high time-and space-resolution experiments to obtain the distributions of arrest times (T ) between successive bursts, which display power-law tails (∝T −α ) with characteristic exponents. These exponents compare well with the ones found for as disparate situations as the evacuation of pedestrians from a room, the entry of a flock of sheep into a shed, or the discharge of particles from a silo. Nevertheless, the intrinsic properties of our system (i.e., channel geometry, driving and interaction forces, particle size distribution) seem to introduce a sharp transition from a clogged state (α 2) to a continuous flow, where clogs do not develop at all. This contrasts with the results obtained in other systems where intermittent flow, with power-law exponents above two, were obtained.

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Transition from clogging to continuous flow in constricted particle suspensions

2020

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“…This, along with its applications in industry, has garnered interest among researchers to explore the characteristics of dense granular media flowing out of a silo. Some works (Pournin et al 2007;Hidalgo et al 2013;López-Rodríguez et al 2019) have been dedicated to comprehending the dynamic behaviour of spherical particles in silos or hoppers. However, solid particles involved in either industry or nature are often non-spherical.…”

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“…2013; López-Rodríguez et al. 2019) have been dedicated to comprehending the dynamic behaviour of spherical particles in silos or hoppers. However, solid particles involved in either industry or nature are often non-spherical.…”

Section: Introductionmentioning

confidence: 99%

Granular particle-shape heterogeneous mixtures discharging through a silo

2021

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“…ere exist few works that focus on the influence of hopper angle on granular clogging for high particle bed [6,25]. e existing work reveals that clogging probability decreases by increasing the hopper angle.…”

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confidence: 99%

Study of Clogging Phenomenon for a Conical Hopper: The Influence of Particle Bed Height and Hopper Angle

Khalid

Zhou

2021

Science and Technology of Nuclear Installations

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The granular flow is one of the principal issues for the design of pebble bed reactors. Particularly, the clogging phenomenon raises an important issue for pebble bed reactors. In this paper, we conduct experiments and discrete particle simulation of two-dimensional discharge granular flow from a conical hopper, to study the effect of the particle bed height h and hopper angle α on the clogging phenomenon. In general, the clogging probability J increases with height h and starts to saturate when h is larger than a critical value. The experimental result trends are supported by discrete simulations. To understand the underlying physical mechanism, we conduct discrete particle simulations for various h values, focusing on the following parameters: the statistical averaging of the volume fraction, velocity, and contact pressure of particles near the aperture during the discharge. We found that, among all relevant variables, the contact pressure of particles is the main cause of the increasement of J when h increases. An exponential law between the pebble bed h and clogging probability J has been established based on these observations and Janssen model. As for hopper angle α , J shows an almost constant behavior for any rise in α followed by a sudden regression at α = 75 ° . Surprisingly, the effect of α is most obvious for intermediate values of h , where we observe a sharp increasement of clogging probability. The same trend is observed in the two-dimensional discrete simulation results.

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Effect of hopper angle on granular clogging

Cited by 35 publications

References 32 publications

Transition from clogging to continuous flow in constricted particle suspensions

Transition from clogging to continuous flow in constricted particle suspensions

Granular particle-shape heterogeneous mixtures discharging through a silo

Study of Clogging Phenomenon for a Conical Hopper: The Influence of Particle Bed Height and Hopper Angle

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