Pattern formation in particle systems driven by color field--颗粒学报PARTICUOLOGY

Liu, X., Qi, H., Ge, W., & Li, J. (2008). Pattern formation in particle systems driven by color field. Particuology, 6(6), 515–520. https://doi.org/10.1016/j.partic.2008.07.021

Pattern formation in particle systems driven by color field

Xiaoxing Liu ^{a b}, Huabiao Qi ^{a b}, Wei Ge ^a *, Jinghai Li ^a

a State Key Lab of Multi-phase Complex Systems, Institute of Processing Engineering, Chinese Academy of Sciences, PO BOX 353, Beijing 100080, China
b Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2008.07.021

Volume 6, Issue 6, December 2008, Pages 515-520

Received 10 June 2008, Accepted 15 July 2008, Available online 11 November 2008.

E-mail: wge@home.ipe.ac.cn

Highlights

Abstract

The structural evolution of systems with two kinds of particles driven in opposite directions, i.e., driven by a color field, is investigated by molecular dynamics simulations. Gaussian thermostat, a common treatment to restrict the thermal velocity of the particles in the systems, has been used so as to account for the dissipation of heat and allow the system to reach a steady state. It has been found that with the increase of the strength of driving force (F), the system undergoes an obvious structural transition from an initially random mixing state to a state characterized by separate lanes and in each lane only one kind of particles exists. The analysis shows that the reason for the formation of lane structure is not only the increase of F but also the variation of particle friction coefficient. While using Gaussian thermostat the particle friction coefficient becomes a function of F. Increasing F leads to high particle friction coefficient and inevitably results in lane formation for strong enough driving force. When lifting the effect of F on friction coefficient and choosing a constant friction coefficient, our results show that for a given F there always exists a critical value of friction coefficient higher than which the system will develop into lane structure.

Graphical abstract

Keywords

Color field; Molecular dynamics (MD); Simulation; Lane formation; Driven system

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