Issue
EPL
Volume 87, Number 4, August 2009
Article Number 44004
Number of page(s) 4
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/87/44004
Published online 15 September 2009
EPL, 87 (2009) 44004
DOI: 10.1209/0295-5075/87/44004

An inter-particle contact area and time restoration for softening treatment in thermal discrete element modeling

Luyi Lu1, Zhaolin Gu1 and Kangbin Lei2

1   Xi'an Jiao Tong University - Xi'an, 710049, China
2   Riken Institute - Wako 351-0198, Japan

guzhaoln@mail.xjtu.edu.cn

received 17 July 2009; accepted in final form 14 August 2009; published August 2009
published online 15 September 2009

Abstract
The thermal discrete element method (TDEM), a coupling of the discrete element model (DEM) with the inter-particle heat transfer models, has been applied to the simulation of the particulate systems with heat transfer. Additionally, small normal spring stiffness coefficient has often been adopted instead of the real value in the softening treatment to improve the calculation efficiency. However, present research has indicated that the heat transfer thus simulated is exaggerated even though such softening treatment has almost no effect on the movement of particles. In this letter, we propose a restoration method to restore the inter-particle contact time and contact area in the real heat transfer process even when particle stiffness is softened by several orders. This restoration method keeps the merit of the softening treatment in the DEM simulation of the particulate systems with heat transfer and avoids the unreasonable heat transfer calculations using the softening treatment method.

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

© EPLA 2009