DEM simulation of the mixing behavior in a spheronization process

Weis, Dominik; Evers, Maria; Thommes, Markus; Antonyuk, Sergiy

doi:10.1016/j.ces.2018.07.057

Cited by 11 publications

(9 citation statements)

References 52 publications

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“…As already described, the drag models according to Bagheri et al [46] and Dioguardi et al [47] are not suitable to simulate the cylindrical particles in the spouted bed, because of the high underestimation of the spouted bed heights (up to 47.7 %) from the experiments. The performed study showed that the correlation of Sanjeevi et al [1] is the best drag model to describe the fluidization of the cylindrical particles.…”

Section: Comparison Of the Experimental And Simulation Resultsmentioning

confidence: 94%

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CFD‐DEM Simulation of Superquadric Cylindrical Particles in a Spouted Bed and a Rotor Granulator

Grohn

Schaedler

Atxutegi

et al. 2022

Chemie Ingenieur Technik

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Dedicated to Prof. Dr.-Ing. Joachim Werther on the occasion of his 80th birthdayThe fluidization behavior of cylindrical particles in a spouted bed was first investigated experimentally using a camera setup. The obtained average spouted bed height was used to evaluate the accuracy of different drag models in CFD-DEM simulations with the superquadric approach to model the particle shape. The drag model according to Sanjeevi et al. showed the best agreement. With this model, cylindrical particles were simulated in a rotor granulator and the particle dynamics were compared with the fluidization of volume equivalent spherical particles.

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Section: Comparison Of the Experimental And Simulation Resultsmentioning

confidence: 94%

“…In the pharmaceutical industry in particular, cylindrical pellets are usually produced by extrusion and then rounded in a spheronizer, dried and coated [1]. Fluidized bed rotor granulators (FBRG), which combine all three process steps, are highly suitable for this purpose.…”

Section: Introductionmentioning

confidence: 99%

CFD‐DEM Simulation of Superquadric Cylindrical Particles in a Spouted Bed and a Rotor Granulator

Grohn

Schaedler

Atxutegi

et al. 2022

Chemie Ingenieur Technik

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“…This Breakage has been investigated in other applications, particularly comminution, by discrete element method (DEM) simulation (e.g., Delaney et al 23 ). In the field of spheronization this technique has been used to investigate the rounding of pellets 8,9 and convective mixing within the rope, 10 for spherical or near-spherical pellets. DEM is well suited to describing the dynamics of extrudates on a rotating friction plate and pellets within a toroidal bed: adding a breakage step to the simulations appears a logical development in the field.…”

Section: Discussionmentioning

confidence: 99%

“…Detailed studies of spheronization dynamics, such as References 5 and 6, have shown that breakage and rounding are effectively sequential processes, with the number of pellets changing little after the initial, short, breakage stage. The time taken to obtain pellets of acceptable sphericity is dominated by the later rounding stage, and this has attracted most attention to date, ranging from dimensional analysis 7 and discrete element modeling 8‐10 . The literature indicates that the friction plate rotational speed, ω , spheronization time, t , and the rheology of the paste are the primary factors governing the rounding process while the amount of extrudates loaded, the friction plate pattern, and extrudate dimensions also play significant roles.…”

Section: Introductionmentioning

confidence: 99%

Modeling the breakage stage in spheronization of cylindrical paste extrudates

Wang

Lim

et al. 2021

AIChE Journal

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Spheronization of cylindrical extrudates on a rotating friction plate involves breakage and rounding. Little attention has been given to the breakage stage and quantitative modeling of this process is scarce. Two simple models are compared with experimental data obtained for the early stages of spheronization of microcrystalline cellulose/water extrudates. Tests were conducted for different times (t), rotational speeds (ω), initial loadings, and on pyramidal friction plates with different dimensions. The first model, describing the number of pellets, validated ω 3 t as a characteristic time scale for the breakage stage. The kinetic parameters obtained by fitting showed a systematic dependence on plate dimensions expressed as a scaled gap width. The second model, a simple population balance, described the evolution of the number and length of pellets. The pseudo rate constants provided insights into the kinetics: extrudates tended to break near the middle, while breakage of smaller pellets was slowed down by more pellet-pellet collisions.

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“…Researchers apply DEM to investigate a large spectrum of unit operations: fluidized and spouted beds; hoppers and silos; mixers; drums; conveyors; furnaces; and spheronizators …”

Section: Applicationsmentioning

confidence: 99%

Experimental Methods in Chemical Engineering: Discrete Element Method—DEM

et al. 2019

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The discrete element method (DEM) is a time-driven simulation technique based on a Lagrangian description of particle motion that predicts the flow of granular matter and fine powders in conveying, mixing, drying, and heterogeneous gas-(liquid)-solids reactors. Powders flowing out of bins form bridges, they segregate in suboptimal pharmaceutical v-blenders, and a stream may split into large gulf streams as they enter fluidized bed reactors from standpipes and diplegs. To reduce the uncertainty in scaling up these and other powder process unit operations, researchers apply DEM. It integrates Newton's second law (acceleration equals the sum of the forces) for each particle and models contacts between the particles with springs and dashpots (dampers). It is computationally intensive since it calculates the trajectory of all particles. The availability of open source codes, commercial software, and parallel computer architectures has accelerated its adoption in pharmaceutical, agro-industrial, and mineral processes, and geophysics. The accuracy of DEM models depends on how well researchers calibrate the contact model expressions and their parameters: friction coefficients and the coefficient of restitution. Systems exceeding 1 × 10 8 particles can require weeks of computational time on large computer clusters. Current research targets non-spherical particle interactions and multiphysics problems including heat transfer, mass transfer, and chemical reactions within the particles. The field has grown to 750 indexed articles in WoS in 2017. A bibliographic analysis recognized four research clusters: granular materials, behaviour, particle shape, and deformation; flows, fluidized beds, and computational fluid dynamics; particles, impact, and validation; and granular flow, dynamics, and segregation.

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DEM simulation of the mixing behavior in a spheronization process

Cited by 11 publications

References 52 publications

CFD‐DEM Simulation of Superquadric Cylindrical Particles in a Spouted Bed and a Rotor Granulator

CFD‐DEM Simulation of Superquadric Cylindrical Particles in a Spouted Bed and a Rotor Granulator

Modeling the breakage stage in spheronization of cylindrical paste extrudates

Experimental Methods in Chemical Engineering: Discrete Element Method—DEM

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