Journal
PHYSICAL REVIEW E
Volume 103, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.103.L030106
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Funding
- NSF China [11875201, 11935010]
- SERB Start-up Research Grant [YSS/2014/000853]
- UGC-BSR Start-Up Grant [F. 30-92/2015]
- UGC, New Delhi, India
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The numerical investigation on the transport of passive colloidal particles in a one-dimensional periodic array of planar counter-rotating convection rolls at high Peclet numbers reveals that advection-enhanced diffusion is suppressed by external transverse bias but reinforced by longitudinal drive. These effects are magnified by imposing free-slip flows at the array's edges. The dependence of the diffusion constant on external forcing reflects the fluid-mechanical robustness of the flow boundary layer mechanism governing diffusion in convection rolls.
We numerically investigated the transport of a passive colloidal particle in a one-dimensional periodic array of planar counter-rotating convection rolls at high Peclet 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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