Numerical study of agglomerate abrasion in a tumbling mixer

Nguyên, Thanh Trung; Willemsz, Tofan A; Frijlink, Henderik W.; Maarschalk, Kees van der Voort

doi:10.1016/j.ces.2014.03.015

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…Some scholars used the bonding model in the discrete element method to disperse the continuum to predict the wear of the continuum. Nguyen, a Dutch scholar, used the discrete element method to numerically simulate the wear and fragmentation of agglomerates in a diffusion blender and distinguished the wear and fragmentation behavior of agglomerates by comparing the amount of agglomerate shrinkage due to bond breakage with the amount of agglomerate shrinkage calculated on a particle-by-particle basis [25]. Luo used a homemade experimental device to measure the discrete element parameters of ellipsoidal pellets and analyzed the effect of different roasting temperatures and equivalent diameters on the discrete element parameters of pellet ores, in addition to measuring and extracting the wear rate and movement velocity of different pellets inside the drum [26].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Microscopic Damage Evolution of Functional Groove in Cageless Bearings

et al. 2023

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Bearings with partial function grooves as cageless bearings related to magnetic floating bearing protection have characteristics, such as fast offsetting of the impact force caused by rotor fall, and they gradually become important parts of ultra clean and cryogenic transportation systems. However, the functional failure mechanism of the bearing, which is caused by functional groove wear, is not clear. Therefore, this paper establishes a force–motion intrinsic model of particles inside the functional groove, which is based on the discrete element method, which it itself combined with the functional groove damage evolution trend analysis. Then, a hyper-quadratic surface model of inter-particle contact is established to simulate the time-varying friction coefficient of the functional groove by combining particles of different sizes to form particle clusters. Additionally, as the boundary condition, EDEM is used to solve the contact motion state of rolling element rolling through the functional groove for one week to obtain the overlap between particles and contact force change law. The results show that the wide side of the functional groove wears more seriously than the narrow side, and the rolling element leaves the functional groove with more impact than when it enters the functional groove, and the functional groove wears more seriously. In this paper, through the study of local functional groove wear of cageless ball bearing, we propose to characterize the damage extension of functional groove by using the number of particle fracture and motion trend in discrete element method, and this study provides theoretical guidance for the design of cageless bearings.

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Section: Introductionmentioning

confidence: 99%

Characterization of Microscopic Damage Evolution of Functional Groove in Cageless Bearings

et al. 2023

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“…Several numerical studies with the discrete element method (DEM) were conducted recently to model the abrasion process, to estimate the abrasion rate of milling media 8 and to explore the effect of milling conditions on the agglomerate properties . Using DEM, Cleary and Morrison 5 explored the mechanisms of particle surface erosion, i.e., chipping, rounding and abrasion, and the mechanism of incremental breakage in tumbling milling.…”

Section: Introductionmentioning

confidence: 99%

“…The processes of abrasion and breakage of agglomerates in a tumbling powder mixer was investigated using DEM by Nguyen et al Cubic monodisperse agglomerates were prepared with 500 fine particles of radius

r = 30 μ normalm

using the Bonded Particle Model . Rod‐shaped fillers were created by overlapping larger particles of radius

r = 70 μ normalm

.…”

Section: Introductionmentioning

confidence: 99%

DEM–PBM modeling of abrasion dominated ribbon breakage

Loreti

Reynolds

et al. 2017

AIChE Journal

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In dry granulation, fine cohesive powders are compacted into large multi‐particle entities, i.e., briquettes, flakes, or ribbons. The powder compaction is generally followed by milling, a size reduction process, which is crucial to obtain the desired granule size or properties. Abrasion and impact are two primary mechanisms of comminution in ribbon milling, but they are not completely understood. The aim of this article was hence to investigate numerically the fragmentation process induced by abrasion during ribbon milling. The discrete element method (DEM) was employed to simulate abrasion tests, for which three‐dimensional parallelepiped ribbons were generated using auto‐adhesive elastic spheres. The fragmentation rate, and the fragments size and number were determined for various surface energies and abrasive velocities. The DEM results showed that the mass‐equivalent fragment size distributions were bi‐modal, similar to the experimental observations and the numerical results for impact‐dominated ribbon milling reported in the literature. In addition, two quantities were determined from the DEM analysis, i.e., the number of large fragments and the fraction of fines, which was then integrated into the population balance models (PBM) so that a DEM–PBM multiscale modeling framework was developed to predict the granule size distribution during ribbon milling. The DEM–PBM results were compared with the experimental results reported in the literature, and a broad agreement was obtained, implying the proposed DEM–PBM can be used to analyse the ribbon milling behavior. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1191–1204, 2018

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