Rapid granular flows on a vibrated rough chute: Behaviour patterns and interaction effects of particles

Dolgunin, V. N.; Kudi, A. N.; Ukolov, A. A.; Tuev, M. A.

doi:10.1016/j.cherd.2017.03.038

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…Obviously, under this condition, dynamic equilibrium in the flow will be achieved in the boundary zone due to an increase in the shear rate and a decrease in the volume fraction of the solid phase, which is confirmed by the results of experimental studies [2,3,25,26].…”

Section: Discussionsupporting

confidence: 62%

“…In accordance with the molecular kinetic theory, the permeability of a medium is characterized by the mean free path of particles. According to the research results presented in [19,25,26], under conditions of the rapid gravity flow of granular materials, the mean free path of particles can be taken equal to the average distance between particles s. This is due to the dominance of the relative shear velocity of particles over the average rate of their fluctuations ( ( )…”

Section: Resultsmentioning

confidence: 99%

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Transversal mass transfer and shear stress formation during rapid gravity flow of a granular medium

Dolgunin

Иванов²,

Akopyan

2021

JAMT

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The micro structural models for shear stress generation during rapid gravity flow of granular materials on a rough chute are discussed. The mechanism of the shear stress formation, taking into account the tangential impulse formed under transversal mass transfer of particles, is suggested. The analogy between granular media during rapid shear deformation and dense gases is used to develop the suggested mechanism on the basis of kinetic theory. The total shear stress is determined as the sum of the stress components induced by collisions, transversal mass transfer and contact interactions of uniform cohesionless inelastic spherical particles. The mathematical models describing the components of shear kinetic stresses are developed as the functions of particle properties, structural and kinematical gravity flow characteristics. The equations of impulse and energy conservation in the course of rapid gravity flow of uniform cohesionless particles are formulated. A variant of the formulation of boundary conditions at the flow bottom is proposed for mathematical modeling of the dynamics of rapid gravity flows of granular materials on a rough chute. The variant assumes the displacement of the area with the most intense shear rate inside the flow and into its layers adjacent to the rough chute surface.

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Section: Discussionsupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Transversal mass transfer and shear stress formation during rapid gravity flow of a granular medium

Dolgunin

Иванов²,

Akopyan

2021

JAMT

View full text Add to dashboard Cite

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“…Many authors have pointed out that rapid shear flows are analogous to molecular gas dynamics, e.g. Savage [5], Ackermann and Shen [12], Hutter et al [13], Jenkins and Berzi [14], Dolgunin et al [15]. This allowed some of them to Proc.…”

Section: Introductionmentioning

confidence: 99%

Interrelation of structural and kinematic characteristics during free-surface gravity flows of granular materials

Kudi¹,

Tuev²,

Иванов³

et al. 2018

Seventh International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2018

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The interrelationship of flow parameters during free surface gravity flow of cohesionless nonelastic particles is investigated on the basis of a granular medium state equation. The equation establishes the relationship between dilatation, normal pressure and granular temperature. The granular temperature is defined as the sum of three elementary types of kinetic energy of particles in the course of its mutual displacements: relative shear movement, chaotic fluctuation and transversal mass transfer. The investigation was carried out by means of the earlier developed experimental and analytical method presupposing the distribution analysis of particles, falling from the discharge threshold of a rough chute. The profiles of velocity and fraction of the void volume have been determined in rapid gravity flows of modeling materials at simultaneous identification of the interrelationship coefficient of the granular medium state equation. The granular materials consisting of uniform spherical particles differing dominantly in roughness were used as model materials. It was found out the coefficient is equal to 10.3 for a wide range of the chute angle and the flow depth of smooth particles. The analogous coefficient value is observed for rough particles when the high chute angle or small bed depth take place only. However, the coefficient value increases more than four times for rough particles at high values of the bed depth and the chute angle close to the angle of repose of the material. This phenomenon is explained hypothetically by the effect of particle rotation.

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Mechanisms and Kinetics of Separation of Impurities of Large and Small Particles in Gravity Flow of Granular Material

Dolgunin

Kudi²,

Tarakanov³

2022

Chem Petrol Eng

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Rapid granular flows on a vibrated rough chute: Behaviour patterns and interaction effects of particles

Cited by 10 publications

References 35 publications

Transversal mass transfer and shear stress formation during rapid gravity flow of a granular medium

Transversal mass transfer and shear stress formation during rapid gravity flow of a granular medium

Interrelation of structural and kinematic characteristics during free-surface gravity flows of granular materials

Mechanisms and Kinetics of Separation of Impurities of Large and Small Particles in Gravity Flow of Granular Material

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