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

作　　者：Jingwen Wang Ming Xu Deming Nie 汪静文;徐明;聂德明(College of Metrology Measurement and Instrument,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]College of Metrology Measurement and Instrument,China Jiliang University,Hangzhou 310018,China

出　　处：《Chinese Physics B》2024年第11期305-311,共7页中国物理B（英文版）

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

摘　　要：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 P´eclet 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.

关 键 词：Brown motion self-propelled particle orientation movement 

分 类 号：O552.1[理学—热学与物质分子运动论]