Flow field during eccentric discharge from quasi‐two‐dimensional silos–extension of the kinematic model with validation

Maiti, Ritwik; Meena, S.; Das, Prasanta Kumar; Das, Gargi

doi:10.1002/aic.15149

Cited by 17 publications

(8 citation statements)

References 26 publications

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“…show, the velocity rises as the aperture widens for a given s. The asymmetry in the velocity profiles about the outlet center (x = 0) is evident, which reduces as s increases. The occurrence of non-zero slip velocity at the wall for s = 0 aligns well with the results reported by Maiti et al 11 . Further, as displayed in Figs.…”

Section: A Velocitysupporting

confidence: 92%

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Self-similar velocity and solid fraction profiles in silos with eccentrically-located outlets

Bhateja,

Jain

2021

Preprint

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We examine the gravity-induced flow of dry and cohesionless granular media through an outlet placed eccentrically in a planar silo, employing computations based on a soft-sphere discrete element method. The vertical velocity profiles, measured at the outlet, are self-similar when the eccentricity is given in terms of the gap (s) between the wall and the corner of the outlet nearest to the wall. On the other hand, the self-similarity of vertical velocity does not always hold for all eccentricities (e) given by the distance between the centers of an outlet and the silo base, which is a typical metric of eccentricity. Similar observations are noted for the profiles of solid fraction. For the former measure of eccentricity, the flow conditions are observed to be similar for different outlet sizes. In contrast, we observe, the latter leads to differing flow patterns for the highest eccentricity wherein the largest outlet touches the sidewall and the rest are located at a distance. This study establishes the importance of s compared to e from the viewpoint of the self-similarity of the vertical velocity and solid fraction profiles at the outlet, and generalizes the notion of the scaling of velocity and solid fraction reported by Janda et al. [Phys. Rev. Lett. 108, 248001 (2012)] in a silo with a centric exit to the one with eccentric granular discharge.Note that the aforestated investigations on the scaling of velocity and solid fraction are carried out in silos having centric apertures. Therefore, naturally, one could think of the appearance of self-similar velocity and solid-fraction profiles in silos having eccentrically-located outlets, especially those placed in proximity to the walls.

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Section: A Velocitysupporting

confidence: 92%

“…which is a edition of Eq. (11). For the data, all points within the orifice are taken into account except for s = 0, wherein the points located upto the Legend for all plots is given in (d).…”

Section: B Solid Fractionmentioning

confidence: 99%

Self-similar velocity and solid fraction profiles in silos with eccentrically-located outlets

Bhateja,

Jain

2021

Preprint

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“…The velocity distribution curve gradually flattens along the upward direction and eventually forms a plateau in the horizontal central zone, that is, a plug flow zone is formed in the upper part of the flowing zone. Such phenomenon has also been experimentally observed for funnel flow discharge 21–25 . Szabo et al 25 found the formation of plug flow zone was closely related to the particle shape.…”

Section: Resultssupporting

confidence: 52%

“…For funnel flow discharge, the flowing zone width first increases with vertical position and then keeps nearly constant 18–20 . Experimentally, it has been found that granular materials in the upper part of the flowing zone could be in plug flow state and notable velocity gradient only appears in the narrow shear region in between the flowing and stagnant zones 16,21–25 . Thus, if we consider the interface between flowing and stagnant zones as a rough surface, the flowing pattern of funnel flow is actually the same as that of mass/semi‐mass flow.…”

Section: Introductionmentioning

confidence: 99%

Fluctuation of particles during funnel flow discharge from flat‐bottomed silos

et al. 2021

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Although resonant motion of particles during mass flow discharge from silos has been extensively investigated by earlier researchers, the appearance of such phenomenon during funnel flow discharge has not been emphasized. In this work, the flow behavior of particles during funnel flow discharge from flat‐bottomed silos has been investigated by conducting three‐dimensional Discrete Element Method (DEM) simulations. It is found that particles in the upper part of flowing zone move collectively, manifested by the oscillatory fluctuations of the velocity and the non‐Gaussian characteristics of the fluctuations of individual velocity around the average. Correlation analysis and discrete Fourier transform have been performed to characterize the emission and propagation of velocity fluctuation. It is found that the observed resonant motion of particles is induced by the regular fluctuation of contact force between particles, and there exists an intermediate region in the converging part of the flowing zone. The bottom boundary of this region corresponds to the emission source from which the velocity wave propagates upward and downward. Its upper boundary coincides with that of the converging part of the flowing zone and is featured by the most violent fluctuation of contact force. The simulation results thus suggest that the discharge of granular assembly seems to be determined by the rheological behavior of particles in this intermediate region.

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“…For example, the flow fields of granular discharge in a two‐dimensional silo were investigated by Maiti et al The kinematic model of granular discharge was extended to simulate the hydrodynamics which was also validated by experiments and examined on its limitations. The mechanics of the arching was analyzed by Wang and Fan in the context of moving bed system during the continuous mass flow.…”

Section: Introductionmentioning

confidence: 99%

A soft‐sphere‐imbedded pseudo‐hard‐particle model for simulation of discharge flow of brick particles

et al. 2016

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A novel hybrid approach of soft-sphere-imbedded pseudo-hard-particle model is proposed to cope with the complex collision of nonspherical particles. In this approach, the boundary of a host hard particle is covered by a series of softspheres, which are allowed to oscillate about the equilibrium position according to the position, orientation, and shape configuration of the host particle. The collision processes are twofold: as a predictive process, particle-particle interaction takes place through the collision between the distributed soft-spheres, which causes subspheres to deviate from the equilibrium positions; as a corrective process, relaxation is superposed to allow the soft-spheres to move back toward the equilibrium positions quickly. Consequentially, this process generates the force and torque on the host particle and determines its movement. Finally, after validation, this new model is used to explore the effects of aspect ratio and base angle on the discharge of brick particles in hoppers.

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Flow field during eccentric discharge from quasi‐two‐dimensional silos–extension of the kinematic model with validation

Cited by 17 publications

References 26 publications

Self-similar velocity and solid fraction profiles in silos with eccentrically-located outlets

Self-similar velocity and solid fraction profiles in silos with eccentrically-located outlets

Fluctuation of particles during funnel flow discharge from flat‐bottomed silos

A soft‐sphere‐imbedded pseudo‐hard‐particle model for simulation of discharge flow of brick particles

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