Journal
POWDER TECHNOLOGY
Volume 374, Issue -, Pages 353-376Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2020.07.051
Keywords
Discrete element method; Maize seed; Particle modelling; Multi-sphere method; Artificial roughness; Multi-contact
Categories
Funding
- National Natural Science Foundation of China [51675218]
- National Key Research and Development Program of China [2016YFD0701901]
- Outstanding Young Talents Fund of Science and Technology Department of Jilin Province of China [20180520049JH]
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To build a widely applicable modelling method for maize seed particles, nine major maize varieties in mainland China are analysed. According to the analysis, maize seed particles can be simplified into 5 shapes, i.e., horse-tooth shape, truncated triangular pyramid shape, ellipsoid cone shape, spheroid shape and irregular shape, and there is a certain functional relationship between the characteristic sizes of each shape of maize seeds. On this basis, the particle models of four shapes of seeds with different accuracy are built using the multi-sphere method. Meanwhile, artificial roughness values are used for evaluation of the filling accuracy of the multi-sphere model, and the calculation formula of the artificial roughness is given. An analysis of the multiple contacts in the multisphere model is also performed. Based on the above works, the feasibility of the modelling method of the maize seed proposed in this paper is verified by comparing the experimental and simulation results of bulk density, angle of repose and self-flow screening. These results show that, when the artificial roughness values of the horse-tooth seed model, the truncated triangular pyramid seed model and the ellipsoid cone seed model are approximately 0.7 or less than 0.7 and the number of filling spheres of the spheroid seed model is no less than 9, then the corresponding simulation results are close to the experimental results. In addition, by comparing the results of the Hertz-Mindlin (no-slip) contact model and the HM-new-restitution contact model, it is also proven that the multiple contacts have less impact on the movement of an assembly of the particle models of maize seeds proposed in this paper. (C) 2020 Elsevier B.V. All rights reserved.
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