Analyzing mixing behavior in a double paddle blender containing two types of non-spherical particles through discrete element method (DEM) and response surface method (RSM)

Jadidi, Behrooz; Ebrahimi, Mohammadreza; Ein‐Mozaffari, Farhad; Lohi, Ali

doi:10.1016/j.powtec.2023.118761

Cited by 11 publications

(2 citation statements)

References 43 publications

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“…The surface of the pyrite and brass ore particles used in the research is smooth and homogeneous, with diameters of R and R , respectively, and the center position vectors of the two ore particles are r and r . The contact area between two types of ore particles is very small, and there is only elastic deformation on the contact surface of the particles, the contact force generated is perpendicular to the contact surface of the two particles [20][21]. The formula for the normal force F between the contact particles of pyrite and brass ore is:…”

Section: Normal Force Acting On Non Cohesive Spherical Ore Particles ...mentioning

confidence: 99%

Study on the segregation effect of pyrite and brass ore particles under combined pendulum vibration

Zhang,

Juanatas,

Niguidula

et al. 2024

J. Phys.: Conf. Ser.

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This article uses a combined pendulum mode to study the segregation behavior of spherical particles of pyrite and brass ore with different diameters using the discrete element method. The numerical simulation program includes extensive oscillation tests on binary mixed particles of pyrite and brass ore spherical particles in different steel U-shaped oscillation grooves, different oscillation frequencies, oscillation angles, and particle sizes. The dispersion coefficient γ calculated from the Lacey mixing index M is used to characterize the segregation behavior of binary mixed particles and track the evolution of segregation. Numerical simulation shows that the oscillation frequency is 8 Hz, the oscillation amplitude is 14°, and the dispersion coefficient γ of the first group with protrusions reaches 0.8, which is about 19.4% higher than the dispersion coefficient 0.67 of the first group with light grooves. The dispersion coefficient γ of the second group with added protrusions reached 0.69, which is about 16.95% higher than the dispersion coefficient 0.59 of the second group when using a light groove. The addition of protrusions improved the particle layering effect. The oscillation amplitude is taken as 14°, and the oscillation frequencies are taken as 6Hz, 8Hz, 10Hz, and 12Hz, respectively. As the oscillation frequency increases, collisions between particles become more intense, and the dispersion coefficient γ between particles increases to a certain extent when it changes from 6Hz to 8Hz. Then, as the oscillation frequency increases, the dispersion coefficient γ decreases in severe fluctuations, and the particle stratification effect actually deteriorates. The oscillation frequency is taken as 8Hz, and the oscillation amplitude is taken as 10°, 14°, and 18°, respectively. After the oscillation amplitude increases to 14°, the dispersion coefficient γ of the particles remains basically stable, and changing the oscillation amplitude has almost no effect on the particle stratification effect. The oscillation frequency is 8Hz, and the oscillation amplitude is 14°. When adding protrusions to the steel U-shaped oscillation groove, the average relative errors of both experimental schemes are less than 1%, and the correlation coefficients are close to 1. The data points are very close to the 45° line. It indicates that the experimental data and simulation values have high consistency, and the discrete element method is feasible and reliable as a method for studying mineral particulate matter. The in-depth study of the separation and stratification behavior of ore particles under combined oscillation is of great scientific significance for the development of new combined vibration equipment.

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Section: Normal Force Acting On Non Cohesive Spherical Ore Particles ...mentioning

confidence: 99%

Study on the segregation effect of pyrite and brass ore particles under combined pendulum vibration

Zhang,

Juanatas,

Niguidula

et al. 2024

J. Phys.: Conf. Ser.

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“…At present, experts at home and abroad have conducted a lot of research on the mixing uniformity between various materials. For example, Jadidi et al [6] developed and calibrated two non-spherical particle models based on discrete element theory to study the effect of factors such as vessel fill level, paddle speed, and the particle number ratio on mixing performance. Yaraghi et al [7] Used a calibrated DEM model to check the impeller speed and investigate the effect of vessel fill level and particle loading method on the overall mixing quality, and the experimental and simulation results were in good agreement.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of soil-agent particle distribution in a new chain plate soil remediation device based on discrete element

Wang,

Zhu,

Wang

et al. 2024

Preprint

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To improve the working efficiency of the in-situ soil remediation equipment, this paper takes black soil particles as the object, and the structural design of the new chain plate soil remediation equipment is carried out based on Solidworks.The mixing process of soil and chemicals under different parameters was investigated using the discrete element method and the orthogonal test method. The experimental designs were all based on horizontal movement speed, chain knife speed, screw speed, and uniform mixing distance as test factors and discrete coefficient and soil fragmentation rate as indices. The test method uses a unidirectional test to determine the value of the reference centre level for the orthogonal test and a combined balancing method to determine and validate the optimum parameters of the soil remediation device. The optimised parameters were determined as follows: the horizontal movement speed of the mechanism is 0.15 m/s, the rotational speed of the chain knife is 5.25 m/s, the rotational speed of the screw is 187.5 rpm, and the homogeneous mixing pitch is 98mm, respectively. The dispersion coefficient was reduced by 7.43% and the soil fragmentation rate increased by 5.45% compared to the operating parameters of the baseline group.

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Optimisation of soil-agent particle distribution in a new chain plate soil remediation device based on discrete element method

Wang,

Zhu,

Wang

et al. 2024

Granular Matter

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Analyzing mixing behavior in a double paddle blender containing two types of non-spherical particles through discrete element method (DEM) and response surface method (RSM)

Cited by 11 publications

References 43 publications

Study on the segregation effect of pyrite and brass ore particles under combined pendulum vibration

Study on the segregation effect of pyrite and brass ore particles under combined pendulum vibration

Optimisation of soil-agent particle distribution in a new chain plate soil remediation device based on discrete element

Optimisation of soil-agent particle distribution in a new chain plate soil remediation device based on discrete element method

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