Effect of vibration characteristics on the performance of mixing in a vertically vibrated bed of a binary mixture of spherical particles

Menbari, Amir; Hashemnia, Kamyar

doi:10.1016/j.ces.2019.07.026

Cited by 28 publications

(15 citation statements)

References 33 publications

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“…In conclusion, high processing intensity could significantly elevate the mixing speed for cohesive powders. Similar phenomenon has also been reported in another work 57 …”

Section: Numerical Results and Discussionsupporting

confidence: 92%

Discrete element method simulation of binary blend mixing of cohesive particles in a high‐intensity vibration system

2022

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The effects of processing intensity, time, and particle surface energy on mixing of binary cohesive powder blends in high‐intensity vibration system were investigated via discrete element method simulations. The mixedness was quantified by the coefficient of variation, Cv; lower being better. The mixing rate, which is the speed at which homogeneity was achieved, was inversely proportional to the mixing Bond number, defined as the ratio of particle cohesion to the shear force resulting from the mixing intensity. Results show that both increasing processing intensity and reducing surface energy led to a faster mixing rate. However, the mixedness improved initially as mixing action (the product of mixing rate and mixing time) increased, but later deteriorated upon its further increase. Thus, both mixing rate and mixing intensity need to be tuned for optimum mixing performance depending on the cohesion level of particles; too high or too low mixing action should be avoided.

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“…In conclusion, high processing intensity could significantly elevate the mixing speed for cohesive powders. Similar phenomenon has also been reported in another work 57 …”

Section: Numerical Results and Discussionsupporting

confidence: 92%

Discrete element method simulation of binary blend mixing of cohesive particles in a high‐intensity vibration system

2022

View full text Add to dashboard Cite

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“…Any further increase in vibration intensity does not improve mixing any better. 1 The motor−camshaft arrangement connected to the vibrated packed bed is used to fix the amplitude of vibration. The frequency is fixed at 12 Hz and the amplitude is varied in the range of 4−16 mm.…”

Section: Resultsmentioning

confidence: 97%

“…This is the main mechanism of mixing in the system. Any further increase in vibration intensity does not improve mixing any better …”

Section: Resultsmentioning

confidence: 98%

“…This result is true for spherical and nonspherical particles and gives good agreement with previous simulation and experimental results. 1,41,47 Fixing the system to this critical value (Γ = 4.64) gives us the "optimum added energy" needed to mix the system. Higher values would cost more energy (more money) in real-life situations without necessarily improving the mixing.…”

Section: Resultsmentioning

confidence: 99%

“…Nonspherical particles are ubiquitously present in industry and nature. Some of the real-life applications include the pharmaceutical and food processing units, − cement, and mining factories. , Nonspherical particles are used in various forms like tablets, catalyst pellets, powder, breakfast, cereal, pasta, candies, grains, plastic, and so forth. The shape of naturally occurring grains like wheat is close to a prolate-shaped particle.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Influence of aspect ratio of ellipsoidal particles on mixing in vibrated packed bed using discrete element method

Khatoon,

Kumar,

Yogi

et al. 2024

AIChE Journal

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The uniform mixing of particles is crucial in many industrial applications. In industries, most granular materials are nonspherical, with ellipsoids being a common deviation from the sphere. The study employs the DEM model to investigate the mixing of a binary mixture in a vibrated packed bed with fixed amplitude and frequency. The study explores the behavior of the binary mixture of coarse and fine particles, with one particle being ellipsoid of aspect ratios (0.25–3.0) and the other being a sphere. The subdomain mixing index quantifies the mixing. The mixing of binary mixtures is determined by the aspect ratio of coarse and fine particles. The mixing efficiency is indicated by the average velocity of reference spherical particles, reflecting the convection strength within the bed. The results show higher average velocity in an ellipsoidal‐sphere mixture than in a sphere‐sphere mixture. The DEM results are validated with an identical experimental system.

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Effect of vibration characteristics on the performance of mixing in a vertically vibrated bed of a binary mixture of spherical particles

Cited by 28 publications

References 33 publications

Discrete element method simulation of binary blend mixing of cohesive particles in a high‐intensity vibration system

Discrete element method simulation of binary blend mixing of cohesive particles in a high‐intensity vibration system

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

Influence of aspect ratio of ellipsoidal particles on mixing in vibrated packed bed using discrete element method

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