Analysis of threshed rice mixture separation through vibration screen using discrete element method
Keywords:
rice mixture separation, vibration screen, discrete element method, numerical computation, mechanismAbstract
The discrete element method was utilized to construct three-dimensional discrete element models for the rice mixture, and their motions were analyzed numerically on a planar vibration screening device. The results showed that, after falling onto the vibrating screen surface, the mixture undergoes a reciprocating motion within the same cycle. During the screening process, the mixture undergoes segregation, slides along the screen surface, passes through the screen and then falls. In comparing the movement of grains and shriveled grains, it can be seen that the velocity of shriveled grains experiences cyclical changes, which is consistent with the grains’ motion cycle. The impact on grains is shown to be greater than that on shriveled grains, and the average speeds of shriveled grains and grains converge. The curve shows that the screening of repetitive movements has a significant effect on the average velocity of shriveled grains, but also the velocity of shriveled grains and the vibration parameters can be well represented by a fitting equation. It is beneficial for the separation of grains from shriveled grains to choose a greater vibration frequency and screen surface inclination in the range of commonly used. Keywords: rice mixture separation, vibration screen, discrete element method, numerical computation, mechanism DOI: 10.25165/j.ijabe.20171006.2910 Citation: Li H, Wang J S, Yuan J B, Yin W Q, Wang Z M, Qian Y Z. Analysis of threshed rice mixture separation through vibration screen using discrete element method. Int J Agric & Biol Eng, 2017; 10(6): 231–239.References
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[2] Cleary P W. DEM simulation of industrial particle flows: Case studies of dragline excavators, mixing in tumblers and centrifugal mills. Powder Technology, 2000; 109(1–3): 83–104.
[3] Li J, Webb C, Pandiella S S, Campbell G M. Discrete particle motion on sieves—a numerical study using the DEM simulation. Powder Technology, 2003; 133(1-3): 190–202.
[4] Li J, Wee C, Pandiella S S, Campbell G M. A numerical simulation of separation of crop seeds by screening–effect of particle bed depth. Food and Bioproducts Processing, 2002; 2: 109–117.
[5] Chen Y H, Tong X. Application of the DEM to screening process: a 3D simulation. Mining Science and Technology, 2009; 19: 493–497.
[6] Jiao H G, Li J R, Zhao J F, Zhao Y M. Discussion on the calculation parameters of discrete element method. Journal of Henan Polytechnic University (Natural Science), 2007; 1: 88–93. (in Chinese)
[7] Wiącek J. Geometrical parameters of binary granular mixtures with size ratio and volume fraction: experiments and DEM simulations. Granular Matter, 2016; 18(3): 42.
[8] Zhao Y M, Zhang S G, Jiao H G, Tie Z J. Simulation of discrete element of particles motion on the vibration plane. China University of Mining & Technology, 2006; 35(5): 586–590. (in Chinese)
[9] Jiao H G, Zhao Y M. Screen simulation using a particle discrete element method. China University of Mining & Technology, 2007; 36(2): 232–236. (in Chinese)
[10] Jiao H G, Zhao Y M. Computer emulation of particle motion on the screen plate and its validation by test. Mining & Metallurgy, 2006; 15(1): 63–67. (in Chinese)
[11] Lenaerts B, Aertsen T, Tijskens E, de Ketelaere B, Ramon H, de Baerdemaeker J, et al. Simulation of grain–straw separation by Discrete Element Modeling with bendable straw particles. Computers and Electronics in Agriculture, 2014; 101: 24–33.
[12] Zhao L L, Liu C S, Yan J X, Jiang X W, Zhang Y. Numerical simulation of particle segregation behavior in different vibration modes. Acta. Phys. Sin., 2010; 59(04): 2582–2588. (in Chinese)
[13] Zhao L L, Liu C S, Yan J X, Jiang X W, Zhu Y. Numerical simulation on segregation process of particles using 3D discrete element method. Acta Phys Sin, 2010; 59(3): 1870–1877. (in Chinese)
[14] Zhao L L, Liu C S, Yan J X, Jiang X W, Zhu Y. Numerical simulation of particles flow on the vibrating screen plate using a 3D discrete element method. China University of Mining & Technology, 2010; 39(3): 414–419. (in Chinese)
[15] Zhao L L, Liu C S, Yan J X, Xu Z P. Numerical simulation of particles screening process based on 3D discrete element method. China Coal Society, 2010; 35(2): 307–311. (in Chinese)
[16] Oda M, Iwashita K, Kakiuchi T. Importance of particle rotation in the mechanics of granular materials. Powders & grains, 1997; 97: 207–210.
[17] Zhao Y Z, Jiang M Q, Xu P, Zheng J Y. Discrete element simulation of the microscopic mechanical structure in sandpile. Acta Phys Sin, 2009; 58(03): 1819–1825. (in Chinese)
[18] Li H, Yin W Q, Gao X, Liu Y. Construction of three-dimensional model of grain based on reverse engineering. Nat. Sci. Ed., 2011; 39(12): 201–206. (in Chinese)
[19] Zhou Z E. Agricultural materials. Beijing: Agriculture Press, 1994. (in Chinese)
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Published
2017-11-30
How to Cite
Hua, L., Jinshuang, W., Jianbo, Y., Wenqing, Y., Zhiming, W., & Youzhang, Q. (2017). Analysis of threshed rice mixture separation through vibration screen using discrete element method. International Journal of Agricultural and Biological Engineering, 10(6), 231–239. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/2910
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Agro-product and Food Processing Systems
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