自推进Janus粒子从空腔中逃逸动力学的数值模拟
Escape Kinetics of Self-Propelled Janus Particles from a Cavity: Numerical Simulations
摘要：
我们数值研究了椭圆Janus粒子从具有反射壁的二维狭窄腔中的逃逸动力学。Janus粒子的自推进速度沿着它们的长轴（长轴）或短轴（扁轴）。我们发现，平均出口时间是非常敏感的腔的几何形状，粒子的形状和自推进强度。当自推进长度等于空泡尺寸时，平均出口时间最小。我们还发现最佳的平均逃逸时间作为自推进速度，平移扩散和颗粒形状的函数。因此，可以实现通道中Janus粒子的有效传输控制机制。
英文摘要：
We numerically investigate the escape kinetics of elliptic Janus particles from narrow two-dimensional cavities with reflecting walls. The self-propulsion velocity of the Janus particle is directed along either their major (prolate) or minor axis (oblate). We show that the mean exit time is very sensitive to the cavity geometry, particle shape and self-propulsion strength. The mean exit time is found to be a minimum when the self-propulsion length is equal to the cavity size. We also find the optimum mean escape time as a function of the self-propulsion velocity, translational diffusion, and particle shape. Thus, effective transport control mechanisms for Janus particles in a channel can be implemented.
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