Effects of coefficient of friction and coefficient of restitution on static packing characteristics of polydisperse spherical pebble bed--颗粒学报PARTICUOLOGY

Wang, J., Lei, M., Yang, H., Xu, K., Xu, S., Zhao, P., & Song, Y. (2021). Effects of coefficient of friction and coefficient of restitution on static packing characteristics of polydisperse spherical pebble bed. Particuology, 57, 1-9. https://doi.org/10.1016/j.partic.2020.12.013

Effects of coefficient of friction and coefficient of restitution on static packing characteristics of polydisperse spherical pebble bed

Jian Wang ^{a b}, Mingzhun Lei ^a *, Hao Yang ^a, Kun Xu ^a, Shuling Xu ^a, Pinghui Zhao ^a^b, Yuntao Song ^a

a Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
b University of Science and Technology of China, Hefei 230026, Anhui, China

10.1016/j.partic.2020.12.013

Volume 57, August 2021, Pages 1-9

Received 14 September 2020, Revised 14 December 2020, Accepted 18 December 2020, Available online 3 February 2021, Version of Record 22 February 2021.

E-mail: leimz@ipp.ac.cn

Highlights

• Cylinder polydisperse spherical ceramic pebble bed was simulated via DEM.

• Parametrical effects on static packing characteristics were presented.

• Neither the coefficient of friction nor restitution affected the oscillation width.

• Peak of force and coordination number distribution left-shifted with increasing friction.

• Consideration of effect of difference between coefficients of friction and restitution was essential.

Abstract

The effects of the coefficient of friction and coefficient of restitution on the static packing characteristics of a polydisperse spherical pebble bed are numerically investigated using the discrete element method. Several important static packing characteristics under different coefficients of friction and restitution are presented and discussed. The results show that the coefficients of friction and restitution impose opposite effects on the packing heights and global packing factor. Neither the coefficient of friction nor restitution affected the oscillation width of the wall, whereas their effects are primarily reflected in the oscillation amplitude of the radial local packing factor and the axial local packing factor distribution at the top of the pebble bed. In both the contact force distribution and coordination number distribution, a left-shifted phenomenon appearing as the coefficient of friction occurred, and only the magnitude of the maximum frequency is affected when the coefficient of restitution changed from 0.1 to 0.9. In all simulation cases, the effects of the coefficients of friction and restitution are similar to that of cross-impact.

Graphical abstract

Keywords

Static characteristic; Discrete element method; Input parameter; Polydisperse pebble bed; Ceramic pebble

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