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  • Letter

Advection-enhanced diffusion in biased convection arrays

Yunyun Li1, Qingqing Yin1, Fabio Marchesoni1,2,*, Tanwi Debnath3, and Pulak K. Ghosh4,†

  • 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, University of Calcutta, Kolkata 700009, India
  • 4Department of Chemistry, Presidency University, Kolkata 700073, India

  • *fabio.marchesoni@pg.infn.it
  • †pulak.chem@presiuniv.ac.in
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Phys. Rev. E 103, L030106 – Published 29 March, 2021

DOI: https://doi.org/10.1103/PhysRevE.103.L030106

Abstract

We numerically investigated the transport of a passive colloidal particle in a one-dimensional periodic array of planar counter-rotating convection rolls at high Péclet numbers. We show that advection-enhanced diffusion is drastically suppressed by an external transverse bias but strongly reinforced by a longitudinal drive of appropriate intensity. Both effects are magnified by imposing free-slip flows at the array's edges. The dependence of the diffusion constant on an external forcing is interpreted as a measure of the fluid-mechanical robustness of the flow boundary layer mechanism governing diffusion in convection rolls.

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Phys. Rev. E 103, L030106– Published 29 March, 2021
  • Received 13 December 2020
  • Accepted 11 March 2021
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