Size-induced axial band structure and directional flow of a ternary-size granular material in a 3-D horizontal rotating drum

Yang, Shiliang; Sun, Yuhao; Ma, Honghe; Chew, Jia Wei

doi:10.1063/1.5022861

Cited by 10 publications

(4 citation statements)

References 61 publications

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“…As shown in Figure S1a, the portion with the highest local SRT is in the radial center at the active–passive interface, which corresponds to the radial core of slow‐moving particles (Figure S1b). This distribution pattern of the binary mixture of cylindrical particles is similar to that of the monodisperse spherical particles and monodisperse cylindrical particles investigated before, which suggests it is not tied to segregation effects but is an intrinsic behavior of the drum.…”

Section: Resultssupporting

confidence: 77%

“…In the industrial processes with intensive heat release, a large local SRT in a specific region leads to an undesirable hot spot, which adversely affects the chemical reaction and may lead to off‐specification products. Similar to the mapping method proposed in our previous work, a cubic geometry with sides of 0.24, 0.24, and 0.72 m is adopted to enclose the whole domain, followed by uniformly dividing the whole cubic geometry with constituent grid cells with equal sides of 3 mm. In the tracking process, a time variable is assigned for each cylindrical particle.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental and numerical work focused on the segregation behavior of spherical particles have been carried out in the rotating drum to understand the segregation mechanisms . However, these reports are all related to the segregation characteristics of spherical particles.…”

Section: Introductionmentioning

confidence: 99%

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Segregation behavior of binary mixtures of cylindrical particles with different length ratios in the rotating drum

et al. 2019

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Particle shape impacts the flow behavior of granular material but this effect is still far from being fully understood. Using discrete element method, the current work explores the segregation phenomena of the binary mixtures of cylindrical particles (differing in length but with the same diameter) in the three-dimensional rotating drum operating in the rolling regime, with each cylindrical particle fully represented by the superquadric equation. The important characteristics and the effect of length ratio on the flow dynamics of the binary mixtures are discussed. Some trends are in sync with those of binary mixtures of spherical particles. Unique to nonspherical particles is the orientation of particles, with results indicating that the cylindrical particles align their major axes perpendicular to the drum axis and this behavior becomes more significant for large particles when the length ratio increases. The length-induced radial segregation causes the orientation of large cylindrical particles to be less uniform.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

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Segregation behavior of binary mixtures of cylindrical particles with different length ratios in the rotating drum

et al. 2019

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“…The segregation extent of binary particles exerts non-negligible influence on the system performance. Here, the segregation index Γ for multicomponent particles is introduced to quantify the extent of binary particle segregation normalΓ = 1 − ξ ξ ideal where ξ is the instantaneous mixing extent at a certain time and ξ ideal stands for the mixing extent under a well-mixed state. The segregation index Γ ranges from 0 to 1.…”

Section: Resultsmentioning

confidence: 99%

Particle-Scale Simulation Study of Size-Induced Segregation Characteristics of Binary Particles in a Liquid–Solid Fluidized Bed

Sun

Yang

Bao

et al. 2023

Ind. Eng. Chem. Res.

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The presence of multiple solid particles in a fluidized bed is widespread and has a significant impact on the bed hydrodynamics and heat/mass transfer. In the present work, the mixing and segregation process of premixed binary particles in a liquid–solid fluidized bed is numerically investigated via the computational fluid dynamics-discrete element method (CFD-DEM). In this method, the particles are assumed to be spherical, and their interactions and collisions are calculated using a soft-sphere model. The bed expansion height, pressure drop, and pressure distribution profile obtained by this model are well validated with experimental data. The aim of this study is to investigate particle-level information (e.g., particle velocity, dispersion coefficient and force) during the segregation process and the effect of the particle size ratio and fluidization velocity on them. The results show that particle velocity has similar distribution with the particle dispersion coefficient (D p). During the initial stage, small particles experience stronger interphase momentum exchange and thus have a higher velocity and D p. Enlarging the particle size ratio from 2 to 4, the radial particle D p and velocity increase while the axial ones decrease, indicating the enhancement of interphase momentum change along the radial direction. Increasing the liquid velocity from 0.140 to 0.170 m/s, the segregation index increases from 34.8% to 69.9%. The numerical results can provide valuable guidance for the optimization design of such apparatus in chemical operations, helping to enhance the efficiency and performance.

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Particle shape-induced axial segregation of binary mixtures of spheres and ellipsoids in a rotating drum

Gan

Pinson³

et al. 2021

Chemical Engineering Science

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Size-induced axial band structure and directional flow of a ternary-size granular material in a 3-D horizontal rotating drum

Abstract: Size-induced axial band structure and directional flow of a ternary-size granular material in a 3-D horizontal rotating drum.

Cited by 10 publications

References 61 publications

Segregation behavior of binary mixtures of cylindrical particles with different length ratios in the rotating drum

Segregation behavior of binary mixtures of cylindrical particles with different length ratios in the rotating drum

Particle-Scale Simulation Study of Size-Induced Segregation Characteristics of Binary Particles in a Liquid–Solid Fluidized Bed

Particle shape-induced axial segregation of binary mixtures of spheres and ellipsoids in a rotating drum

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