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• W2997487666 abstract "The rotary valve is the most frequently used piece of equipment that is suitable for the controlled feeding or discharging of products in powdered or granular form. It is usually connected to silos, hoppers, pneumatic conveying systems, bag filters or cyclones. In this paper, a simulation study is presented on the discharge of solid particles from a silo through a rotary valve. The discrete element method (DEM), which accounts for collisions between particles and particle-wall collisions, was used to model and simulate the motion of individual particles. The diameter of the simulated silo was 0.2 m and a total of 245,000 particles were calculated. In the simulations, the effect of the geometric and operational parameters of the rotary valve on the mass outflow rate was investigated. The diameter of the rotary valve varied between 0.06 and 0.12 m and the rotational speed of the rotor was changed between 0.5 and 5 1 . The simulations showed that the mass outflow rate of the particles from the rotary valve changes periodically due to its rotary cell structure. Within the lower range of rotational speeds of the rotor, the mass outflow rate of particles changes linearly in correlation with the rotational speed. The identification of this linear section is important in terms of control as this would facilitate the implementation of control devices by applying well-established linear control algorithms. Adjacent to the linear section, the dependence of the average mass outflow rate on the rotational speed was found to be nonlinear. Within the upper range of examined rotational speeds for each diameter of the rotary valve, the mass outflow rate reaches a maximum then decreases. The simulations were performed using GPU hardware. The application of parallel programming was an essential aspect of the simulations and significantly decreased the calculation time of simulations. In the treatment of particle-wall contacts, a novel flat triangular-based geometric representation technique was used which allows the particle-wall contacts to be calculated more effectively and their treatment implemented more easily into the parallel programming code. Using the calculated particle positions, the particles were visualized to view the effect of the interactions between the particles and rotor blades on particle motion. The simulation results showed that the discrete element method is capable of determining the detailed flow patterns of particles through the rotary valve at various rotational speeds." @default.
• W2997487666 created "2020-01-10" @default.
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• W2997487666 date "2019-12-12" @default.
• W2997487666 modified "2023-09-23" @default.
• W2997487666 title "GPU-Accelerated Simulation of a Rotary Valve by the Discrete Element Method" @default.
• W2997487666 doi "https://doi.org/10.33927/hjic-2019-18" @default.
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