分仓颗粒布居分聚现象的通量模型

The flux profile of granular gas in compartmentalized system

置于以窗口连接的分隔仓中振动驱动的颗粒气体会出现颗粒在两仓中布居分聚现象,被形象地称为麦克斯韦妖现象.通量模型的建立是理解麦克斯韦妖现象的关键问题.Eggers以颗粒气体动力学为基础得出了简化的理论模型.该模型可以很好地得到分仓中颗粒的布居分聚现象,然而似乎无法用于预测两种颗粒在分仓体系中的布居振荡现象.通过实验研究,测量了颗粒气体的流通量曲线,改进了Eggers模型.改进的模型可以很好地得到两种颗粒在分仓体系中的布居振荡现象.

Vibration driven compartmentalized granular gas is capable of clustering in one of the compartments, which is an effect called Maxwell demon phenomenon. One of the keys for understanding the Maxwell demon phenomenon is establishing a flax model. Based on granular hydrodynamics, Eggers deduced a simplified flax model which has been successfully used in describing the spontaneous symmetry breaking of granular gas in the compartmentalized system, but so far has not been able to predict the oscillation phenomenon of bidisperse granular gas. Experimentally studying the flux of mono-disperse granular gas in one compartment, we modify the flux model of Eggers to fit the experimental results. The modified flux model can be extended to the bidisperse granular case, and the oscillatory state can be well obtained by this modified flux model.