Excess Diffusion of a Driven Colloidal Particle in a Convection Array
Qingqing Yin1 , Yunyun Li1* , Fabio Marchesoni1,2* , Debajyoti Debnath3 , and Pulak K. Ghosh3*
1 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, China2 Dipartimento di Fisica, Università di Camerino, I-62032 Camerino, Italy3 Department of Chemistry, Presidency University, Kolkata, India
Abstract ：We numerically investigate the transport of a passive colloidal particle in a periodic array of planar counter-rotating convection rolls, at high Péclet numbers. It is shown that an external bias, oriented parallel to the array, produces a huge excess diffusion peak, in cases where bias and advection drag become comparable. This effect is not restricted to one-dimensional convection geometries, and occurs independently of the array's boundary conditions.
收稿日期: 2020-11-21
出版日期: 2021-04-06
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2021, Vol. 38 
