Issue
EPL
Volume 87, Number 1, July 2009
Article Number 14003
Number of page(s) 4
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/87/14003
Published online 24 July 2009
EPL, 87 (2009) 14003
DOI: 10.1209/0295-5075/87/14003

Impact energy loss from particle surface roughness in particulate systems

Zhaolin Gu1, Luyi Lu1 and Li Ai2

1   Xi'an Jiao Tong University - Xi'an, 710049, China
2   Institute of Earth Environment, Chinese Academy of Sciences - Xi'an 710075, China

guzhaoln@mail.xjtu.edu.cn

received 17 May 2009; accepted in final form 26 June 2009; published July 2009
published online 24 July 2009

Abstract
A majority of mechanics models have been developed to reveal the interaction between two particles in particulate systems under the assumption that particle surfaces are smooth. In this letter, the surface-roughness–induced impact friction model, incorporated with the rolling friction model, was established to study the particle-particle interaction in the particulate system. The results indicate that energy dissipation was caused in part by the impact energy loss in the particulate system with the particle stiffness more than 10 GPa and particle diameter on the order of millimeter magnitude. This letter gives an insight into the assumption that the impact energy loss from particle surface roughness should not be neglected, at least, in some particulate systems.

PACS
47.55.Kf - Particle-laden flows.
47.57.Gc - Granular flow.

© EPLA 2009