Numerical analysis of flow pattern transition in a conical silo with ellipsoid particles

Han, Yingpeng; Jia, Fuguo; Li, Gengrun; Liu, Hanru; Li, Jiming; Chen, Peiyu

doi:10.1016/j.apt.2019.06.004

Cited by 24 publications

(6 citation statements)

References 45 publications

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“…To improve the validity of the simulation and calculation, parts not in contact with fertilizer particles were removed. 24,25 The geometric model was created with Pro/E software (the scale was 1:1) and imported into the EDEM software in .igs format, as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Numerical analysis and performance optimization of a spiral fertilizer distributor in side deep fertilization of a paddy field

Tang

Jiang

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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To improve the quality of side deep fertilization in paddy fields and study the dynamic change in fertilizer particles in fertilizer boxes, a model connecting the mechanical components and fertilizer based on the discrete element method was established, and a numerical simulation analysis of the spiral fertilizer distributor was conducted with EDEM software. The primary factors affecting the uniformity and stability of the fertilizer were studied. Using an orthogonal experimental design and numerical simulation technology, the speed, lead and diameter of a steel wire were selected as experimental factors, the mean fertilization value and the fertilization coefficient of the variation were selected as evaluating indicators, a mathematical model between the factors and indicators was established by virtual orthogonal testing, and the numerical processing was optimized with Design-Expert 6.0.10 software. The results showed that the primary and secondary factors affecting the comprehensive performance occurred in the following sequence: steel wire speed > steel wire diameter > steel wire lead. When the speed, lead, and diameter of the steel wire were 15 r/min, 65 mm and 7 mm, respectively, the operation performance was superior. High-speed video camera analysis and bench tests showed that the results were consistent with the simulation optimization. The mean value and the coefficient of variation of fertilization were 9.39 g and 3.71%, respectively, which satisfy the agronomic requirements for paddy field side deep fertilization.

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Section: Methodsmentioning

confidence: 99%

Numerical analysis and performance optimization of a spiral fertilizer distributor in side deep fertilization of a paddy field

Tang

Jiang

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In DEM simulations, properties of individual particles are considered to simulate the overall behavior of the whole system discretely. Each particle is tracked and its motion is governed by Newton's second law [27].…”

Section: Mechanical Contact Modelmentioning

confidence: 99%

Numerical Analysis of Friction-Filling Performance of Friction-Type Vertical Disc Precision Seed-Metering Device Based on EDEM

Wang,

Kang,

Wang

et al. 2023

Agriculture

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A seed-metering device is a key component for precision seeding and the core component of precision seed-metering devices. Nowadays, high-speed seeding is a trend in the development of seed-metering devices, but the filling performance of mechanical seed-metering devices decreases under the condition of high speed. Therefore, this paper explores a controllable method to improve the filling force of seeds, thereby increasing the limit operation speed of the existing mechanical seed-metering devices, so as to achieve high-speed seeding. The friction-filling method of friction vertical disc precision seed-metering devices was numerically simulated using the DEM. In this paper, the relationship between the relevant parameters and seed-filling force was confirmed via comparing theoretical formulas. The friction-filling method was studied via numerical simulation and experimental verification. This research demonstrated that during the process of friction filling, the pressure on the side wall of the tube increased with the e exponent with the change in the position of the particles. When the friction coefficient between the particles and the side wall is less than the friction coefficient between the particles, the e exponent increases. A surge occurs when the ratio of the square tube side length to the particle radius is n3+2(n=1,2,3).

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“…In reality, most of particle shapes are usually not spherical, therefore it is scientifically and industrially important to study how particle shape affects flow rheology and clogging mechanism. Several studies [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] have been performed to understand the effect of particle shape on the discharge flow through simula-tion by using DEM. Li et al [22] and Langston et al [23] found that elliptical particles discharge faster than the circular ones, which was explained by particle alignment yielding a lower resistance to flow.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle shape on packing fraction and velocity profiles at outlet of a silo

Gao¹,

Chen²,

H³

2023

Chinese Phys. B

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Many studies on how the particle shape affects the discharge flow mainly focus on discharge rates and avalanche statistics. In this study, the effect of the particle shape on the packing fractions and velocities of particles in the silo discharge flow was investigated by using discrete element method. The time-averaged packing fraction and velocity profiles through the aperture were systematically measured for superelliptical particles with different blockiness. Increasing the particle blockiness is found to increase resistance to flow and reduces the flow rate. At an identical outlet size, larger particle blockiness leads to lower velocities and packing fractions at the outlet. The packing fraction profiles display evident self-similar features that can be appropriately adjusted by fractional power laws. The velocity profiles for particles with different shapes obey a uniform self-similar law that is in accord with previous experimental results, which is compatible with the free fall arch hypothesis. To further investigate the origin of flow behaviors, the packing fraction and velocity fields in the region above the orifice were computed. Based on these observations, the flow rate of superelliptical particles was calculated and agrees with the simulated data.

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Numerical analysis of flow pattern transition in a conical silo with ellipsoid particles

Cited by 24 publications

References 45 publications

Numerical analysis and performance optimization of a spiral fertilizer distributor in side deep fertilization of a paddy field

Numerical analysis and performance optimization of a spiral fertilizer distributor in side deep fertilization of a paddy field

Numerical Analysis of Friction-Filling Performance of Friction-Type Vertical Disc Precision Seed-Metering Device Based on EDEM

Effect of particle shape on packing fraction and velocity profiles at outlet of a silo

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