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 on 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 at understanding the transport controlling mechanism of active matter in confined structures.
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21 November 2021
Research Article|
November 15 2021
Escape kinetics of self-propelled particles from a circular cavity
Tanwi Debnath
;
Tanwi Debnath
1
Department of Chemistry, University of Calcutta
, Kolkata 700009, India
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Pinaki Chaudhury
;
Pinaki Chaudhury
1
Department of Chemistry, University of Calcutta
, Kolkata 700009, India
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Taritra Mukherjee;
Taritra Mukherjee
2
Department of Chemistry, Presidency University
, Kolkata 700073, India
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Debasish Mondal
;
Debasish Mondal
3
Department of Chemistry and Center for Molecular and Optical Sciences & Technologies, Indian Institute of Technology Tirupati
, Yerpedu 517619, Andhra Pradesh, India
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Pulak K. Ghosh
Pulak K. Ghosh
a)
2
Department of Chemistry, Presidency University
, Kolkata 700073, India
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 155, 194102 (2021)
Article history
Received:
September 09 2021
Accepted:
October 28 2021
Citation
Tanwi Debnath, Pinaki Chaudhury, Taritra Mukherjee, Debasish Mondal, Pulak K. Ghosh; Escape kinetics of self-propelled particles from a circular cavity. J. Chem. Phys. 21 November 2021; 155 (19): 194102. https://doi.org/10.1063/5.0070842
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