Directional motion of dust particles at different gear structures in a plasma
Dai Chao-Xing, Song Chao, Zhou Zhi-Xiang, Sun Wen-Tao, Guo Zhi-Qiang, Liu Fu-Cheng, He Ya-Feng
       

Schematic diagram of the experimental setup. The upper right corner is a magnified view of the gears with asymmetric sawtooth. The depths of the sawtooth in the inner and outer gears are 3 mm and 4 mm, respectively. The radii of the inner and outer gears are 26 mm and 40 mm, respectively. The heights of the two gears are both 7 mm.