The effect of side walls on particles mixing in rotating drums

Jain, Aman; Evrard, Fabien; Wachem, Berend van

doi:10.1016/j.partic.2022.02.011

Cited by 16 publications

(5 citation statements)

References 51 publications

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“…The motion of nonspherical particles was tracked through Newton's laws by the Lagrangian method. The conservations equations for the position, translational velocity, angular velocity, and particle orientation (quaternions) are expressed as (2) (3) (4) (5) Where m i , I i , and g are the particle mass, moment of inertia tensor, and gravity acceleration, respectively. F c,i and τ i are the total contact force and torque acting on the particle i, respectively.…”

Section: Superquadric Demmentioning

confidence: 99%

“…Using this method, the details of each particle can be monitored . Extensive studies have previously been conducted to achieve many great results in terms of granular motion by using this method, and have tried to figure out many important mechanisms behind the motion, such as the effects of drum geometry or internals on the granular, , the flow regimes transitions in rotating drums, − the mechanism of mixing and segregation of a binary mixture or polydisperse mixtures in rotating drums, − etc. Most DEM codes used by those studies concentrated on spherical particles or assumed granules of spherical shape, which simplified the real process and reduced the computational cost.…”

Section: Introductionmentioning

confidence: 99%

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SuperDEM Simulation and Experiment Validation of Nonspherical Particles Flows in a Rotating Drum

Cui

Dai

et al. 2023

Ind. Eng. Chem. Res.

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Understanding the flow behaviors of nonspherical particles is critical for rotating drum design and optimization. Rotating drum experiments of particles of different properties were conducted and the flow behavior was investigated by high-resolution camera recordings. The superquadric discrete element method (SuperDEM) was employed to simulate the spherical and nonspherical particle flows and validated by comparing the simulation results with the experimental data. A sensitivity study shows that angles of repose of spheres, cubes, and green beans were approximately constant when the friction coefficient was larger than 0.3, while for cylindrical shape particles, angles increased continuously until μ was 0.6. To study the impact of shapes, the validated model was applied to simulate particles of different shapes with the same density and volume. It was found that cylindrical particles with smaller sphericity had larger repose angles and were packed more densely than spheres, and the relationship between sphericity and angle was nonlinear. Nonspherical particles had a higher kinetic energy conversion efficiency, and cylinders’ and cubes’ average rotational kinetic energies were also larger than that for spheres. The ratio of the rotational kinetic energy to the total kinetic energy of cylinders was up to 10.59%, which indicated the significant impacts of particle shapes. Besides, particle shapes significantly affect the anisotropic distribution of the normal contact forces, especially for cylinders and cubes.

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Section: Superquadric Demmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SuperDEM Simulation and Experiment Validation of Nonspherical Particles Flows in a Rotating Drum

Cui

Dai

et al. 2023

Ind. Eng. Chem. Res.

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“…At present, the stirring and mixing mechanisms mainly include convective mixing, diffusion mixing and shear mixing [27] . The mixing process was roughly divided into three stages: the initial stage of mixing, the middle stage of mixing, and the later stage of mixing [28] .…”

Section: Particle Mixing Processmentioning

confidence: 99%

Discrete element simulation of the grain mixing law in brown rice germination device

Yan,

Xie,

Bai

et al. 2024

International Journal of Agricultural and Biological Engineering

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The discrete element method (DEM) was used in this study to numerically simulate the mixing process and motion law of particles in brown rice germination device. And the reliability of simulation experiments was verified through physical experiments. In the discrete element simulation experiment, there were three mixing stages in the mixing process of the particles. The particle motion conditions at different rotational speeds were rolling, cascading, cataracting and centrifuging. The lower the filling degree, the higher the particle mixing efficiency. The radial trajectory of the particles was approximated as an elliptical helix that continuously shrank towards the axis. The research results indicated that under the same speed and filling conditions, the motion of brown rice particles in both the simulated and physical test environments is rolling and the drop height is the same.

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“…The dynamic angle of repose is considered to be the control parameter for axial pattern formation for dry heterogeneous granular mixtures (Inagaki & Yoshikawa 2010). It is noted that the end walls of the rotating drum initiate axial band formation via an axial flow due to friction at the end walls (Chen, Ottino & Lueptow 2010;Arntz et al 2013;Jain, Fabien & van Wachem 2023).…”

Section: Introductionmentioning

confidence: 99%

“…It is noted that the end walls of the rotating drum initiate axial band formation via an axial flow due to friction at the end walls (Chen, Ottino & Lueptow 2010; Arntz et al. 2013; Jain, Fabien & van Wachem 2023).…”

Section: Introductionmentioning

confidence: 99%

Mechanism for axial pattern formation of concentrated suspension in a horizontal rotating cylinder

Konidena,

Vowinckel,

Seto

et al. 2024

J. Fluid Mech.

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We have performed numerical simulations to investigate the phenomenon of axial pattern formation exhibited by a non-neutrally buoyant concentrated suspension. Continuum modelling of the concentrated suspension is done using the suspension balance model to identify the underlying mechanism of the phenomenon. We demonstrate that axial concentration variations become amplified to axial bands owing to the influence of the second normal stress difference ( $N_2$ ), and the first normal difference ( $N_1$ ) accentuates the effect of $N_2$ . We demonstrate that the end walls of the rotating cylinder are necessary to prevent the smearing out of axial bands but are not a direct cause of the phenomenon.

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The effect of side walls on particles mixing in rotating drums

Cited by 16 publications

References 51 publications

SuperDEM Simulation and Experiment Validation of Nonspherical Particles Flows in a Rotating Drum

SuperDEM Simulation and Experiment Validation of Nonspherical Particles Flows in a Rotating Drum

Discrete element simulation of the grain mixing law in brown rice germination device

Mechanism for axial pattern formation of concentrated suspension in a horizontal rotating cylinder

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