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利用棘轮结构可以对随机运动的颗粒进行整流使其产生定向的输运。不同尺寸的颗粒对棘轮整流的响应不同，因此可以利用棘轮实现颗粒分离。基于前期气相等离子体中颗粒整流与分离实验，本文通过构建三维模型对双分散颗粒分离的物理机理进行研究。首先通过等离子体流体模拟及双正弦函数插值的方法，得到实验难以测得的不对称棘轮通道内等离子体参量分布，并对微米级尘埃颗粒在棘轮鞘层中的受力进行分析，进一步利用Langevin方程对尘埃等离子体棘轮中双分散颗粒定向输运过程进行数值模拟，重现了颗粒分离实验现象。结果分析表明，双分散的尘埃颗粒悬浮在鞘层中不同的高度，并受到相反取向的不对称势的作用，造成其向相反方向的输运。A ratchet can be employed to rectify randomly moving particles,generating directional transport.Taking advantage of the distinct responses of particles with different sizes to the system,bi-dispersed particles can be effectively separated.Based on previous experiments demonstrating the rectification and separation of dust particles in gas-phase plasma,a three-dimensional model is constructed to reveal the physical mechanism behind the separation of bi-dispersed dust particles here.Utilizing plasma fluid simulation and double sine function interpolation,the distribution of plasma parameters in the asymmetric ratchet channel is obtained,which is challenging to measure experimentally.Subsequently,a numerical simulation of the directional transport process of bi-dispersed dust particles in a dusty plasma ratchet is conducted by solving the Langevin equation.The results analyze the forces acting on micro-sized dust particles in the sheath and reproduce the experimental phenomenon of particle separation.The numerical simulation reveals that the bi-dispersed dust particles,suspended at different heights within the sheath,experience asymmetric potentials with opposite orientations,leading to their distinct transport and subsequent separation.
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Keywords:
- dusty plasma /
- ratchet /
- particle separation
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