Escape kinetics of self-propelled particles from a circular cavity

Abstract

We numerically investigate the mean exit time of an inertial active Brownian particle from a circular cavity with single or multiple exit windows. Our simulation results witness distinct escape mechanisms depending upon the relative amplitudes of the thermal length and self-propulsion length compared to the cavity and pore sizes. For exceedingly large self-propulsion lengths, overdamped active particles diffuse on the cavity surface, and rotational dynamics solely governs the exit process. On the other hand, the escape kinetics of a very weakly damped active particle is largely dictated by bouncing effects on the cavity walls irrespective of the amplitude of self-propulsion persistence lengths. We show that the exit rate can be maximized for an optimal self-propulsion persistence length, which depends on the damping strength, self-propulsion velocity, and cavity size. However, the optimal persistence length is insensitive to the opening windows' size, number, and arrangement. Numerical results have been interpreted analytically based on qualitative arguments. The present analysis aims to understand the transport controlling mechanism of active matter in confined structures.

13 pages

References in corpus (18)

• Self-motile colloidal particles: from directed propulsion to random walk
• Motility-Induced Phase Separation
• Artificial Brownian motors: Controlling transport on the nanoscale
• Physics of Microswimmers - Single Particle Motion and Collective Behavior
• Inertial effects of self-propelled particles: from active Brownian to active Langevin motion
• Entropic Stochastic Resonance
• Activated escape of a self-propelled particle from a metastable state
• Giant Negative Mobility of Janus Particles in a Corrugated Channel
• Active escape dynamics: the effect of persistence on barrier crossing
• Active Brownian motion in a narrow channel
• Brownian transport in corrugated channels with inertia
• Escape Kinetics of Self-Propelled Janus Particles from a Cavity: Numerical Simulations
• Geometric stochastic resonance in a double cavity
• Transport of active particles in an open-wedge channel
• Impact of inertia on biased Brownian transport in confined geometries
• Activated barrier crossing dynamics of a Janus particle carrying cargo
• Escape rate of transiently active Brownian particle in one dimension
• Escape Kinetics of an Underdamped Colloidal Particle from a Cavity through Narrow Pores

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