Abstract
In this work, granular segregation in a two-compartment cell (Maxwell’s Demon) under zero gravity is studied numerically by DEM simulation for comparison with the experimental observation in satellite SJ-10. The effect of three parameters: the total number of particlesN , the excitation strengthΓ , and the position of the window coupling the two compartments, on the segregatione and the waiting timeτ are investigated. In the simulation, non-zero segregation under zero gravity is obtained, and the segregation e is found independent of the excitation strengthΓ . The waiting time τ, however, depends strongly onΓ .For higher acceleration Γ, |ei | reaches steady state valuee faster.
Highlights
Granular materials’ extremely rich dynamical behaviours have attracted attentions of physicists of different fields in recent years[1-3]
A steady state of the whole system is reached when the dissipation of the system is balanced by the input of the energy
We find that (1) density gradient exists in the cell along excitation direction that particles gather near the end away from the vibration wall; (2) segregation among the two compartments exists even for very small excitation acceleration Γ as long as number of particles N exceeds a critical number and the waiting time is long enough; (3) different from the situation in gravity, segregation ε is independent of Γ when in zero gravity; (4) the waiting time τ is shorter when the acceleration Γ is higher, but reaches a minimum when Γ is large enough
Summary
Granular materials’ extremely rich dynamical behaviours have attracted attentions of physicists of different fields in recent years[1-3]. Fijn = knδ + γ nvn , where kn and γ n are the spring stiffness and the dissipative coefficient, respectively, and vn is the normal component of the relative velocity vij = vi − vj. This is called Linear Spring Dashpot (LSD) model. The flux profile can be found by the counts of collisions per unit time across a given virtual window
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