Segregation phenomena in gravity separators: A combined numerical and experimental study

Kannan, Ananda Subramani; Lassen, N.C. Krieger; Carstensen, Jens Michael; Lund, Jacob; Sasic, Srdjan

doi:10.1016/j.powtec.2016.07.003

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…Separators were used to separate grains from stones or other impurities. Kannan et al [197] simulated the separation process of the discarding of a heavy product (stones) and accumulation of a light product (grains) on the deck of a destoner. Then, the effect of deck inclination vibration speed and fluidizing air velocities at the surface on the segregation performance was investigated and their optimal combination value was obtained [198].…”

Section: Simulation Of Grain Separationmentioning

confidence: 99%

Applications of Discrete Element Method in the Research of Agricultural Machinery: A Review

et al. 2021

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As a promising and convenient numerical calculation approach, the discrete element method (DEM) has been increasingly adopted in the research of agricultural machinery. DEM is capable of monitoring and recording the dynamic and mechanical behavior of agricultural materials in the operational process of agricultural machinery, from both a macro-perspective and micro-perspective; which has been a tremendous help for the design and optimization of agricultural machines and their components. This paper reviewed the application research status of DEM in two aspects: First is the DEM model establishment of common agricultural materials such as soil, crop seed, and straw, etc. The other is the simulation of typical operational processes of agricultural machines or their components, such as rotary tillage, subsoiling, soil compaction, furrow opening, seed and fertilizer metering, crop harvesting, and so on. Finally, we evaluate the development prospects of the application of research on the DEM in agricultural machinery, and look forward to promoting its application in the field of the optimization and design of agricultural machinery.

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Section: Simulation Of Grain Separationmentioning

confidence: 99%

Applications of Discrete Element Method in the Research of Agricultural Machinery: A Review

et al. 2021

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“…The results showed that the seed movement predicted by the model conformed to the experimental result at moisture contents of 12.8-13.2% w.b. Kannan et al (2016) applied a CFD-DEM model to predict the separation of gravel from seeds by a screen-type separator. They studied the effects of the shaking speed and the speed of air that was blown through the sieve from the bottom to keep the particles buoyant.…”

Section: Introductionmentioning

confidence: 99%

Discrete element simulation of brown rice and paddy rice on shaking separator machine

2022

ANRES

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Importance of the work:The operational performance of the tray of a rice separator point is critical to the productivity of a system. Objectives: To determine the angle effects and the influence of the mixing ratio on the separation efficiency of materials. Materials & Methods: Rice seed movement was described based on Newton's law and the Hertz-Mindlin contact model. In the simulation, the paddy rice was mixed in the range 5-50%, the tray was angled 3.5-5.0°, the average particle diameter was 2.13 mm and length was 8.38 mm, with 14% wet basis moisture content. The shaking separator machine for brown and paddy rice was evaluated using discrete element simulation and experiments at the same scale. Results: The simulations predicted the motion of particles very well. The simulation showed that 4.30° was the most appropriate tilt angle of the tray for separating the paddy, with a maximum rejection efficiency of 0.89 Main finding: Several tests or one test with several results are necessary to better select all parameters. The simulation result was confirmed by the experiment in terms of the efficiency of separation and movement on the tray.

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“…9) The DEM has also been applied to the shaking table in an investigation of the separation efficiency under various operating conditions. 10,11) However, these simulation studies were performed using a shaking table with no riffles. Accordingly, there is little information about stratification and segregation in the riffles of the shaking table, though these mechanisms strongly affect the separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Density Segregation on a Shaking Table Using the Discrete Element Method

Tsunazawa

Kon

2021

Mater. Trans.

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A shaking table is used in gravity separation utilizing the difference in density of solid particles and has been widely employed in mineral processing and recycling processes. Although the principle of the table separation is simple, there is still limited knowledge about the segregation and separation mechanisms. To better understand these mechanisms, in this study, the discrete element method was applied to simulations of density segregation associated with the stratification of particles between riffles on a shaking table. The behavior of binary particles having the same diameter and different densities was simulated under various operating conditions. The mixing index was employed to evaluate the segregation state on the shaking table and the progress of segregation was investigated from the viewpoint of the vertical velocity difference between binary particles. Simulation results showed that although a larger amplitude and longer frequency of the shaking table promoted density segregation with time, an excessive amplitude and frequency of vibration was ineffective in promoting density segregation on the shaking table. It was also shown that the time variation of the average vertical velocity difference within one period of the shaking table can explain the progress of density segregation under conditions of various shaking table amplitudes and frequencies. In addition, the velocity difference between particles became larger near the wall than near the center, independent of the amplitude and frequency conditions. Consequently, the discrete element simulation newly revealed density segregation due to the vertical velocity difference between heavy and light particles, especially near the wall. This result will contribute to the optimization of shaking tables.

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Segregation phenomena in gravity separators: A combined numerical and experimental study

Cited by 7 publications

References 17 publications

Applications of Discrete Element Method in the Research of Agricultural Machinery: A Review

Applications of Discrete Element Method in the Research of Agricultural Machinery: A Review

Discrete element simulation of brown rice and paddy rice on shaking separator machine

Numerical Investigation of Density Segregation on a Shaking Table Using the Discrete Element Method

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