Spontaneous unidirectional rotation of a symmetric gear driven by spherical active particles

Open Access

Figure 4

(A) and (B) Schematics of collision of a rod-like active object with the gear. Long-time averaged flow field of rod-like active particles (C), time sequence of $ω$ (D) and the corresponding accumulative angle $∆ θ$ (E) all indicate the disappearance of the unidirectional rotation ( $F_{a} = 8$ , $ϕ = 0.15$ and effective $D_{r}$ of a free rod-like active particle ~0.001).

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