Exit times of a Brownian particle out of a convection roll

Qingqing Yin; Yunyun Li; Fabio MarchesoniTanwi DebnathPulak K. Ghosh

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Exit times of a Brownian particle out of a convection roll

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摘要

We numerically investigated the transient dynamics of a passive colloidal particle in a periodic array of planar counter-rotating convection rolls at high Péclet numbers. We discovered that the distributions of first-exit times out of a single convection roll exhibit distinct regimes: an exponential tail, due to the noise-assisted diffusion of the trapped particle from the center toward the edge of the roll, and a peak structure emerging from a power-law background, associated with the transverse and longitudinal Brownian diffusion of the particle within the rolls' flow boundary layers. These results are interpreted analytically and related to the earlier literature on the topic.

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来源
《Physics of fluids》 |2020年第1期|092010-1-092010-7|共7页
作者
Qingqing Yin; Yunyun Li; Fabio MarchesoniTanwi DebnathPulak K. Ghosh;
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作者单位

Center for Phononics and Thermal Energy Science, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China;

Department of Chemistry, University of Calcutta, Kolkata 700009, India;

Department of Chemistry, Presidency University, Kolkata 700073, India;

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原文格式 PDF
正文语种英语
中图分类流体力学;
关键词
Exit times; Brownian particle out; convection roll;

Exit times of a Brownian particle out of a convection roll

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