Simulation of seed motion in seed feeding device with DEM-CFD coupling approach for rapeseed and wheat

Lei, Xiaolong; Liao, Yitao; Liao, Quan

doi:10.1016/j.compag.2016.11.006

Cited by 92 publications

(50 citation statements)

References 35 publications

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“…The impinging airflow is essentially the relative motion between the particles and the gas, that is, the process by which the ore gravitational potential energy is converted into air kinetic energy. Yu et al 25 and Lei et al 26 used the open source advantages of CFD to edit the API interface and realize the data transfer between EDEM and Fluent. In this paper, the influence of the impact of airflow in the ore pass and the distribution law of the impinging airflow from the generation to the attenuation in the ore pass are studied in the same way.…”

Section: Computational Methods and Experimental Sectionmentioning

confidence: 99%

Research on Control of Ore Pass Dust by Unloading Time Interval and Foam Control Technology

et al. 2020

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To control the dust pollution caused by the unloading of a multilevel ore pass, numerical simulation and similar experiments were carried out to study the airflow and dust migration influenced by the unloading quantity and the continuous unloading at different time intervals in the ore pass. From this research, the following conclusions are drawn: when the first level of the ore pass is unloaded, the third and fourth levels are the main dust-producing positions, and the concentrations of dust in the breathing zone can reach 85 and 325 mg/m 3 , respectively. Increasing the unloading interval and reducing the total single unloading quantity can prevent the superposition of dust production. The foam dust removal technology can reduce the secondary dust generation caused by the backlash of the airflow in the ore pass, and the dust emission rate can reach 60% at the fourth level.

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Section: Computational Methods and Experimental Sectionmentioning

confidence: 99%

Research on Control of Ore Pass Dust by Unloading Time Interval and Foam Control Technology

et al. 2020

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“…The test data was subjected to analysis of variance using Design-Expert [30][31][32]. Table 4 summarizes the significance test results for the regression equation.…”

Section: 2 Multiple-seeding Rate Data and Analysismentioning

confidence: 99%

Design and Experimental Study of a Combined Pneumatic Plot Seed-metering Device for Cotton

Yudao

Xuezhen

2020

IJE

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This study presents a combined pneumatic seed-metering device (SMD) that could not only fill, carry, and meter seeds, but also switch quickly between seed-metering and seed-cleaning modes, and clean seeds thoroughly and rapidly. The seed-filling, seed-carrying, and seed-metering modes of the SMD were analyzed based on a theoretical kinematic model. Furthermore, a three-factor, three-level orthogonal test was conducted by using a performance test bench arranged for the SMD as well as Design-Expert software. The combination of parameters that led to the lowest mis-seeding rate (0.59%) was as follows: an air pressure of 2.67 kPa, a slot width of 2.83 mm, and a seed-metering speed of 20 r/min. The optimized scheme that resulted in a relatively low multiple-seeding rate (4.3%) and met other requirements at the same time was as follows: an air pressure of 2.35 kPa, a slot width of 2.78 mm, and a seed-metering speed of 20 r/min. A field test was subsequently performed by using a combined pneumatic plot cotton planter prototype. While the mis-seeding and re-seeding rates obtained from the field test were both somewhat higher than those obtained from the laboratory bench test, they still met precision planting requirements. The field test validated the accuracy of the theoretical analysis and bench test and served as a foundation for future prototype production and popularization.

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“…In the Eulerian model, the fluid volume fraction term and the motion differential equation are respectively as Equations (1) and (2) [15,16] :…”

Section: Model Description 21 Mathematical Modelmentioning

confidence: 99%

Simulation and experiment of rice cleaning in air-separation device based on DEM-CFD coupling method

Ma¹,

Zhao²,

Guo³

et al. 2020

International Journal of Agricultural and Biological Engineering

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In order to study the movement characteristics and separation mechanism of rice and its impurities under the action of airflow, and lower the impurity rate in the cleaning operation process, rice and its impurities were modeled based on the "overlapping multi-sphere clump method", the DEM-CFD coupling method was used to simulate rice cleaning process under different airflow velocity and airflow inclined angle, and combined with aerodynamics, the motion state and separation behavior of rice and its impurities in the flow field. The results showed that under horizontal airflow conditions, the average impurity rate of rice was the lowest when the airflow velocity was 9 m/s. When the flow velocity remains unchanged and the airflow inclined angle was set at 10°, the average impurity rate decreased, while the entrainment loss rate increased. The airflow velocity was negatively correlated with the impurity rate and positively correlated with the entrainment loss rate, while the airflow inclined angle was negatively correlated with the impurity rate and positively correlated with the entrainment loss rate. By designing and setting up an experimental device, an experiment was carried out with airflow velocity and airflow inclined angle as the factors, and the experimental results were consistent with the simulation results, indicating that it was reliable to study the physical behavior of rice-straw separation in the airflow field by using the DEM-CFD coupling method.

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Simulation of seed motion in seed feeding device with DEM-CFD coupling approach for rapeseed and wheat

Cited by 92 publications

References 35 publications

Research on Control of Ore Pass Dust by Unloading Time Interval and Foam Control Technology

Research on Control of Ore Pass Dust by Unloading Time Interval and Foam Control Technology

Design and Experimental Study of a Combined Pneumatic Plot Seed-metering Device for Cotton

Simulation and experiment of rice cleaning in air-separation device based on DEM-CFD coupling method

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