Application of DEM modified with enlarged particle model to simulation of bead motion in a bead mill--颗粒学报PARTICUOLOGY

Yamamoto, Y., Soda, R., Kano, J., & Saito, F. (2014). Application of DEM modified with enlarged particle model to simulation of bead motion in a bead mill. Particuology, 14, 103–108. https://doi.org/10.1016/j.partic.2013.06.002

Application of DEM modified with enlarged particle model to simulation of bead motion in a bead mill

Yasuhiro Yamamoto ^a *, Rikio Soda ^b, Junya Kano ^b, Fumio Saito ^b

a Mikuni Color Ltd., 101 Kokubunji, Mikunino-cho, Himeji, Hyogo 671-0234, Japan
b Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

10.1016/j.partic.2013.06.002

Volume 14, June 2014, Pages 103-108

Received 16 October 2012, Revised 31 May 2013, Accepted 10 June 2013, Available online 6 August 2013.

E-mail: yamamoto@mikuni-color.co.jp

Highlights

• Bead motion in a mill was simulated with DEM modified by enlarged particle model.

• Simulated velocity increases with increasing virtual frictional coefficient.

• Simulation data with optimum virtual frictional coefficient agree well with experimental results.

• The computing time in the simulation decreases using the modified DEM.

Abstract

We applied the discrete element method (DEM) of simulation modified by an enlarged particle model to simulate bead motion in a large bead mill. The stainless-steel bead mill has inner diameter of 102 mm and mill length of 198 mm. The bead diameter and filling ratio were fixed respectively at 0.5 mm and 85%. The agitator rotational speed was changed from 1863 to 3261 rpm. The bead motion was monitored experimentally using a high-speed video camera through a transparent mill body. For the simulation, enlarged particle sizes were set as 3–6 mm in diameter. With the DEM modified by the enlarged particle model, the motion of enlarged particles in a mill was simulated. The velocity data of the simulated enlarged particles were compared with those obtained in the experiment. The simulated velocity of the enlarged particles depends on the virtual frictional coefficient in the DEM model. The optimized value of the virtual frictional coefficient can be determined by considering the accumulated mean value. Results show that the velocity of the enlarged particles simulated increases with an increase in the optimum virtual frictional coefficient, but the simulated velocity agrees well with that determined experimentally by optimizing the virtual frictional coefficient in the simulation. The computing time in the simulation decreases with increased particle size.

Graphical abstract

Keywords

Discrete element simulation; Bead mill; Bead motion; Enlarged particle model

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