Particle shape-induced radial segregation of binary mixtures in a rotating drum

He, Siyuan; Gan, Jieqing; Pinson, David; Zhou, Zongyan

doi:10.1016/j.powtec.2018.06.005

Cited by 56 publications

(20 citation statements)

References 39 publications

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“…Given the bewilderingly large parameter space for particle shapes, predicting the segregation of mixtures of arbitrary nonspherical particles is quite challenging. Previous studies have considered segregation of nonspherical particles, including ellipsoids [11,12], cuboids and spheres [13], rods [14], and irregularly shaped particles [15], but the data are so limited that no universal scaling has been proposed.…”

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Remarkable simplicity in the prediction of nonspherical particle segregation

Jones

Ottino

Umbanhowar

et al. 2020

Phys. Rev. Research

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Size-disperse mixtures of noncohesive particles segregate, or demix, during flow. For spherical particles, mixture segregation can be predicted based on the relative particle diameters. However, most particle systems in industry and geophysics involve nonspherical particles. Accounting for the immense range of particle shapes introduces additional parameters. As a proxy for nonspherical particles in general, we perform discrete element method simulations of gravity-driven free-surface flows of bidisperse mixtures of mm-sized particles that vary widely in their size and shape (disks, rods, and spheres). Remarkably, the propensity to segregate, measured in terms of a segregation length scale that characterizes the segregation velocity of the two species, can be predicted based on only the volume ratio of the two particle species. The segregation length scale increases linearly with the log of the volume ratio, as it does for bidisperse mixtures of spherical particles, independent of particle shape.

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“…Simulations. We conduct discrete element method (DEM) simulations [16][17][18][19][20] of superellipsoid particles in a gravitydriven free-surface flow [12][13][14][21][22][23]. The particle shape is determined by the inside-outside function for superellipsoids [24][25][26]…”

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confidence: 99%

Remarkable simplicity in the prediction of nonspherical particle segregation

Jones

Ottino

Umbanhowar

et al. 2020

Phys. Rev. Research

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“…The regulation is automatic and continuous by in-mixer analysis of the sand during mixing [39]. Jiang et al, [3] analyzed the significance of the gravel filling degree, the drum rotational speed, number of lifters and drum diameter selected as the influencing mixing factors in the rotating drum (rotary kiln and ball mill) being widely used in food processing, smelting, cement, pharmaceuticals and other related industries [3,4,40,41]. Wu and Saxena, [42] studied the mixing of light paper pellets in a sand fluidized bed at varying paper pellets proportions (0-20 mass%) over a range of air velocities (0-1.5 m/s) at surface and ambient conditions.…”

Section: Applications To Metal Casting Industries and Fuels In Combustion Enginesmentioning

confidence: 99%

Design and Fabrication of a Multi-Purpose Homogenizer

O.O¹,

O.F²,

Omoyeni³

et al. 2020

NIPES

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The homogenizer is vital equipment in numerous production sectors such as in food processing, animal feed processing, chemical and pharmaceutical industries, waste recycling and mineral and allied industries. In this work, a multi-purpose homogenizer suitable for the mixing of different materials (animal and fish feeds, coal fuel, foundry sand etc) was designed; fabricated and the performance of the machine evaluated. The cost is about #

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“…Using the numerical model based on the DEM method, the particle segregation in the rotary drum can be also investigated. Segregation mechanisms in mixing of cohesive and non-cohesive particles are also analyzed in this way [16,23]. In addition, models for the description of mixing processes the diffusion equation [24].…”

Section: Introductionmentioning

confidence: 99%

DEM Investigation of the Influence of Particulate Properties and Operating Conditions on the Mixing Process in Rotary Drums: Part 2—Process Validation and Experimental Study

et al. 2020

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The process of homogenization of particulates is an indispensable part of many industrial processes, and, therefore, it is necessary to pay a special attention to this area and develop it. This paper deals with a complex study of homogenization of particulate matters in a rotary drum in terms of shape, size, and density of particles. In addition, the influence of operating parameters, such as drum filling capacity, rotational speed, and drum filling pattern are also investigated. Studies of reproducibility of discrete element method simulations, effects of rotary drum sizes or effects of drum volumetric filling to the mixture homogeneity index were also carried out. In general, the least satisfactory values of the homogeneity index resulted from the mixing of particles with different densities. The dominating factor of homogenization was the drum filling-up degree. The course of the homogeneity index in 140, 280, and 420 mm drums was very similar and after five revolutions of the drum, identical values of the homogeneity index were achieved for all the drum diameters. The optimal drum filling-up degree is at 40–50% for the spherical particles and 30–40% for the sharp-edged particles. The repeatability of simulations showed the maximum relative standard deviation of the homogeneity index at 0.6% from ten simulation repetitions with the same parametric conditions.

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Particle shape-induced radial segregation of binary mixtures in a rotating drum

Cited by 56 publications

References 39 publications

Remarkable simplicity in the prediction of nonspherical particle segregation

Remarkable simplicity in the prediction of nonspherical particle segregation

Design and Fabrication of a Multi-Purpose Homogenizer

DEM Investigation of the Influence of Particulate Properties and Operating Conditions on the Mixing Process in Rotary Drums: Part 2—Process Validation and Experimental Study

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