Effect of non-sphericity of a narrow-sized binary mixture on mixing in convective vibrated packed bed using Discrete Element Method

Yogi, Jeetram; Dubey, Praveen; Khatoon, Salma; Iyer, Karthik; Kumar, Sunil; Anand, Anshu

doi:10.1016/j.powtec.2023.118600

Cited by 8 publications

(1 citation statement)

References 63 publications

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“…It is calculated by comparing the surface area of the given particle to that of an ideal sphere with the same volume . Particle sphericity is a crucial parameter in understanding various characteristics of particles, such as their behavior in fluid flows, packing ability in a volume, and surface interactions. , Particularly, in the case of bed materials employed within a FB reaction environment, initial particle sphericity as well as sphericity developed throughout the process may offer valuable insights into particle activity and the propensity for attrition or fragmentation.…”

Section: Introductionmentioning

confidence: 99%

Role of Particle Geometry on the Structural Integrity of Sand and Rock Ilmenite Used as Oxygen Carrier in Combustion of Woody Biomass

Valizadeh,

Faust,

Skoglund

et al. 2024

Energy Fuels

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The role of particle geometry in the structural integrity of sand and rock ilmenite bed particles was studied under prolonged exposure to oxygen carrier-aided combustion (OCAC) conditions in a 12 MW th circulating fluidized bed (CFB) boiler. Woody biomass was used as fuel. Bed particles were collected at different stages of the exposure. Fresh bed particles were used as reference samples. All the materials were examined by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray microtomography (XMT). The obtained results showed that over time, sphericity diminishes in sand ilmenite, whereas the sphericity of rock ilmenite particles remains unchanged. For both bed types, it was noticed that cracks are mainly connected to the concave areas on the bed particle surface. It was also observed that in sand ilmenite, the bed particle layer predominantly forms on convex areas, resulting in nonuniform distribution, whereas in rock ilmenite, with infrequent convex and concave features, the layer is thicker and exhibits a more uniform distribution. Consequently, the bed particle layer in rock ilmenite plays a higher protection against the outward migration of iron. This, coupled with a lower frequency of concave areas, contributes to a reduced average volume fraction of porous regions and cracks, which makes rock ilmenite structurally more resistant to breakage than sand ilmenite. Notably, the difference in the structural integrity of the two bed types becomes even more pronounced with longer exposure times.

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Section: Introductionmentioning

confidence: 99%

Role of Particle Geometry on the Structural Integrity of Sand and Rock Ilmenite Used as Oxygen Carrier in Combustion of Woody Biomass

Valizadeh,

Faust,

Skoglund

et al. 2024

Energy Fuels

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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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SIPHPM simulation and analysis of cubic particle mixing in a tilted tumbler and application of a new mixing index construction principle

Zhang,

Gui,

Yang

et al. 2024

Comp. Part. Mech.

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Effect of non-sphericity of a narrow-sized binary mixture on mixing in convective vibrated packed bed using Discrete Element Method

Cited by 8 publications

References 63 publications

Role of Particle Geometry on the Structural Integrity of Sand and Rock Ilmenite Used as Oxygen Carrier in Combustion of Woody Biomass

Role of Particle Geometry on the Structural Integrity of Sand and Rock Ilmenite Used as Oxygen Carrier in Combustion of Woody Biomass

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

SIPHPM simulation and analysis of cubic particle mixing in a tilted tumbler and application of a new mixing index construction principle

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