Extension of silo discharge model based on discrete element method

Oldal, István; Safranyik, Ferenc

doi:10.1007/s12206-015-0825-3

Cited by 27 publications

(26 citation statements)

References 30 publications

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“…The particle factory was a rectangular plane of 555 mm×250 mm. The number of soil particles generated per second by the unilateral particle factory is 9.50×10 4 [21,22] .…”

Section: Simulation and Results Analysis Of The Soil Covering Process mentioning

confidence: 99%

Design and field test of crosswise belt type whole plastic-film ridging-mulching corn seeder on double ridges

Dai

Guo

Song

et al. 2019

International Journal of Agricultural and Biological Engineering

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In order to realize seedbed mechanization of whole plastic-film mulching on double ridges and to overcome the difficulty in crosswise belt type soil covering by whole plastic-film, a kind of crosswise belt type whole plastic-film ridging-mulching corn seeder on double ridges was designed in this study. The key components of the sample machine was designed and its working parameters of seedbed soil covering device, crosswise-belt soil covering mechanism and profiling sowing depth adjustment device were determined. After numerical simulation on the film edge and crosswise soil covering by whole plastic-film on double ridges by discrete element method, the velocity and displacement of the oscillating plate, and the variation rule of amount of covered soil with time were explored. Field test results show that, when the advancing velocity of the machine was 0.50 m/s, the qualified rate of soil width covered on film edge of the seedbed reached 96.1%, qualified rate of crosswise soil belt width was 94.5%, qualified rate of soil thickness on seedbed was 95.3%, qualified rate of sowing depth was 89.3%, qualified rate of spacing between crosswise soil belts reached 93.6%, which all met related standards in China and satisfied design requirements, and could realize seedbed mechanization of whole plastic-film mulching on double ridges. Comparison tests on working performances of practical soil covering show a basic consistence with the seedbed soil covering simulation, and verified the effectiveness of the soil covering model built by using discrete element method.

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“…The particle factory was a rectangular plane of 555 mm×250 mm. The number of soil particles generated per second by the unilateral particle factory is 9.50×10 4 [21,22] .…”

Section: Simulation and Results Analysis Of The Soil Covering Process mentioning

confidence: 99%

Design and field test of crosswise belt type whole plastic-film ridging-mulching corn seeder on double ridges

Dai

Guo

Song

et al. 2019

International Journal of Agricultural and Biological Engineering

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“…The newly found displacement is then used to determine the contact forces and torques in that place because of the particle interactions in their new position. This cycle repeats multiple times to model the bulk material's mechanical behavior [43]. This approach is ideal for analysing the special behavior and motion of granular materials [44] or to examine the effect of vibration [43].…”

Section: Dem Simulationmentioning

confidence: 99%

Evaluation the effect of particle sphericity on direct shear mechanical behavior of granular materials using discrete element method (DEM)

Talafha

Oldal

2021

IJEM

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Granular materials are an essential component of many fields, such as the medicine and agriculture industries, where their behavior is affected by the properties of constituent particles. The Discrete Element Method (DEM) is a potential technique used to describe the mechanical behavior of granular materials by making a mechanical model which describes the affected parameters, and one of these parameters is the shape of particles. It is an important characteristic that is represented by a sphericity index. In this study, the macro and micromechanical shear behaviors of granular materials are investigated using the Discrete Element Method (DEM). For this purpose, a three-dimensional (3D) program (EDEM) was developed on the basis of (DEM) and was used to model various particle shapes for a direct shear test. An assembly with a different particle center distance was prepared. The results showed a changing relationship between shear strength and the sphericity index, and micro-mechanical responses showed that particle shape affected the shape and the thickness of the shear zone.

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“…First-order upwind scheme was adopted for the turbulent flow kinetic energy and turbulent dissipation rate with residual accuracy of 10 -3 s. In coupling calculation, since the solid phase volume fraction was less than 10%, which belongs to dilute phase pneumatic conveying system, so the Euler-Lagrangian coupling model was selected. The Ergun and Wen & Yu model that can well adapt to the void ratio was adopted as drag force model, meanwhile, Magnus lift and Sevman shear were recorded [16,17] .…”

Section: Coupling Parameter Setting Of the Modelmentioning

confidence: 99%

Simulation and test on separating cleaning process of flax threshing material based on gas-solid coupling theory

Dai

Song

Guo

et al. 2020

International Journal of Agricultural and Biological Engineering

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In order to further clarify and improve the working performance of separating cleaning device of flax threshing material, and study the motion law and characteristics of components of flax threshing material, in this paper, numerical simulation was carried out on the separating cleaning process of flax threshing material based on CFD-DEM method. Simulation results showed that the components of flax threshing material were separated and cleaned under the influence of airflow field, meanwhile, variation curves of quantity and mean velocity of flax seeds in the separating cleaning system were obtained. By referring to streamline distribution of gas-solid coupling, the quantity variation law of components of flax threshing material with time was explored and their motion curves and variation tendency of average velocity were studied. Verification test results showed that the cleaning rate of separating cleaning device for flax threshing material was 92.66% with 1.58% of total separation loss. Compared with simulation results, the test results were 1.34% and 0.93% lower, showing that it is feasible to apply the gas-solid coupling theory and method to simulate the separating and cleaning operation of flax threshing material.

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Extension of silo discharge model based on discrete element method

Cited by 27 publications

References 30 publications

Design and field test of crosswise belt type whole plastic-film ridging-mulching corn seeder on double ridges

Design and field test of crosswise belt type whole plastic-film ridging-mulching corn seeder on double ridges

Evaluation the effect of particle sphericity on direct shear mechanical behavior of granular materials using discrete element method (DEM)

Simulation and test on separating cleaning process of flax threshing material based on gas-solid coupling theory

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