Relationship between self-propelled velocity and Brownian motion for spherical and ellipsoid particles

doi:10.1088/1674-1056/ad7727

Abstract The Brownian motion of spherical and ellipsoidal self-propelled particles was simulated without considering the effect of inertia and using the Langevin equation and the diffusion coefficient of ellipsoidal particles derived by Perrin. The Péclet number (Pe) was introduced to measure the relative strengths of self-propelled and Brownian motions. We found that the motion state of spherical and ellipsoid self-propelled particles changed significantly under the influence of Brownian motion. For spherical particles, there were three primary states of motion: 1) when $Pe< 30$, the particles were still significantly affected by Brownian motion; 2) when $Pe> 30$, the self-propelled velocities of the particles were increasing; and 3) when $Pe> 100$, the particles were completely controlled by the self-propelled velocities and the Brownian motion was suppressed. In the simulation of the ellipsoidal self-propelled particles, we found that the larger the aspect ratio of the particles, the more susceptible they were to the influence of Brownian motion. In addition, the value interval of $Pe$ depended on the aspect ratio. Finally, we found that the directional motion ability of the ellipsoidal self-propelled particles was much weaker than that of the spherical self-propelled particles.

Keywords: Brown motion self-propelled particle orientation movement

Received: 18 July 2024
Revised: 26 August 2024
Accepted manuscript online: 04 September 2024

PACS:	46.65.+g	(Random phenomena and media)
	05.40.Jc	(Brownian motion)
	47.27.ek	(Direct numerical simulations)
	05.10.Gg	(Stochastic analysis methods)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12372251 and 12132015) and the Fundamental Research Funds for the Provincial Universities of Zhejiang (Grant No. 2023YW69).

Corresponding Authors: Deming Nie
E-mail: nieinhz@cjlu.edu.cn

Cite this article:

Jingwen Wang(汪静文), Ming Xu(徐明), and Deming Nie(聂德明) Relationship between self-propelled velocity and Brownian motion for spherical and ellipsoid particles 2024 Chin. Phys. B 33 114601

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Relationship between self-propelled velocity and Brownian motion for spherical and ellipsoid particles

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