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Excess Diffusion of a Driven Colloidal Particle in a Convection Array |
| Qingqing Yin1, Yunyun Li1*, Fabio Marchesoni1,2*, Debajyoti Debnath3, and Pulak K. Ghosh3* |
1Center 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
2Dipartimento di Fisica, Università di Camerino, I-62032 Camerino, Italy
3Department of Chemistry, Presidency University, Kolkata, India
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| Cite this article: |
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Qingqing Yin, Yunyun Li, Fabio Marchesoni et al 2021 Chin. Phys. Lett. 38 040501 |
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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.
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Received: 21 November 2020
Published: 06 April 2021
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11875201 and 11935010). P.K.G. is supported by SERB Start-up Research Grant (Young Scientist) (Grant No. YSS/2014/000853) and the UGC-BSR Start-up (Grant No. F.30-92/2015). D.D. thanks CSIR, New Delhi, India, for support through a Junior Research Fellowship. |
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