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

Yang, Shiliang; Wang, Hua; Wei, Yonggang; Hu, Jianhang; Chew, Jia Wei

doi:10.1002/aic.16799

Cited by 15 publications

(10 citation statements)

References 31 publications

(54 reference statements)

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“…Segregation is a natural incidence that occurs in granular particle mixtures with different shapes, sizes, and densities. The mixing of particles to create a uniform blend is challenging and becomes even more difficult if there is a variation in physical properties of blending particles. − The handling of granules (grains, fertilizers, pharmaceuticals, and detergents) is a particular concern during composite processing and manufacturing where both storage (caking) and transport (natural segregation and blockage) of granules are often considered as problematic. Transport of such blends inevitably leads to a natural segregation process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Mixing of Nonspherical Particles in a Vibrated Packed Bed Mixer

Yogi

Verma

Kumar

et al. 2021

Ind. Eng. Chem. Res.

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The effect of the shape of particles on mixing and segregation is studied in a vibrated packed bed mixer. Binary mixtures (unequal sized) of four types of nonspherical glass particles (cube, prolate, oblate, and elongated needle) with different aspect ratios are used alongside spherical particles. The overarching goal is to explore the effect of the nonsphericity of granules (particles > 2 mm) used in the food and pharmaceutical industries. The experimental studies analyze the mixing behavior based on the particle (shape and size) and system (frequency and amplitude) parameters. The results show the existence of a critical vibration intensity (Γ = 4.64) below which there is little mixing. In addition, the axial segregation index (SI) value is also significantly correlated to the random monodisperse packing fraction of coarse particles. The axial SI follows the decreasing trend: cube > sphere > oblate > prolate > elongated needle. Similarly, increasing the fine particles’ angularity from 0 to 0.15, the axial segregation is reduced from 0.40 to 0.24. The nonsphericity of particles reveals the tendency to mix more than spherical particles. These results have important industrial design implications and provide heuristics to reduce segregation by selecting the particle shape.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Mixing of Nonspherical Particles in a Vibrated Packed Bed Mixer

Yogi

Verma

Kumar

et al. 2021

Ind. Eng. Chem. Res.

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“…They proposed that the growth and stabilization of a regular streak pattern required the two sets of particles to differ significantly in angle of repose. Yang et al 27 studied the segregation of cylindrical particles with different length ratios. They argued that the cylindrical particles tend to align their major axis perpendicular to the drum axis.…”

Section: Introductionmentioning

confidence: 99%

A Discrete Element Method Study of Monodisperse Mixing of Ellipsoidal Particles in a Rotating Drum

Gan

Pinson³

et al. 2020

Ind. Eng. Chem. Res.

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Rotating drums are widely used in the industry for mixing, milling, coating, and drying processes. In the past decades, mixing of granular materials in rotating drums has been extensively investigated, but most of the studies are based on spherical particles. Particle shape has a significant effect on the flow behavior and thus mixing performance, but studies and understanding are still limited. In this work, discrete element method is employed to study the radial mixing of ellipsoids in a rotating drum. The effects of rotation speed and aspect ratio of ellipsoids on mixing quality and rate are investigated, and the underlying mechanisms are further developed. The results show that mixing index increases rapidly over time for both spheres and ellipsoids. Particles with various shapes of ellipsoids can reach wellmixed states after sufficient revolutions. The increase in rotation speed decreases the mixing rate for both spheres and ellipsoids. Generally, ellipsoids exhibit a higher mixing rate when the rotational speed ranges between 25 and 40 rpm. At 40 rpm, as the aspect ratio of ellipsoids deviates from 1.0, the mixing rate increases significantly and achieves the maximum when the aspect ratio is 0.75 or 1.5. A further increase in particle non-sphericity incurs a decrease in mixing rate. The increase in the deviation of aspect ratio from 1.0 contributes to stronger "slipping" of particles relative to the drum wall. Compared with ellipsoids, spheres have stronger diffusive mixing and weaker convective mixing in rolling or cascading regimes.

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“…machines, where the rotation axis of the vessel is orthogonal to the direction of gravity vector. Most of them are so-called "ball mills" and are used for the raw material processing [4][5][6][7][8][9]. 2. machines, where the rotation axis of the vessel is parallel to the direction of gravity vector.…”

Section: Disc Pelletezing Processmentioning

confidence: 99%

Numerical modeling of bulk flow on a pelletizing disc in different rotational regimes

Gladky

Lieberwirth

Lampke³

et al. 2021

Granular Matter

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Pelletizing processes are used in various industries to agglomerate fine materials. Investigation of this process is important for optimizing corresponding equipment and machines. In this article the particle-based discrete element method is used to simulate the particle behavior of a dry material on an inclined rotating disc (pelletizing disc). The process is modelled in different rotation regimes and by varying the inclination angle of the disc. Qualitative model verification is performed by a comparison of numerical simulations with experimental data. Contact data is used to analyze the flow mode of the simulated material and for detecting critical rotation speeds.

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

Cited by 15 publications

References 31 publications

Experimental Study of Mixing of Nonspherical Particles in a Vibrated Packed Bed Mixer

Experimental Study of Mixing of Nonspherical Particles in a Vibrated Packed Bed Mixer

A Discrete Element Method Study of Monodisperse Mixing of Ellipsoidal Particles in a Rotating Drum

Numerical modeling of bulk flow on a pelletizing disc in different rotational regimes

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