We numerically investigate the transport of a Brownian colloidal particle in a square array of planar counter-rotating convection rolls at high Peclet numbers. We show that an external force produces huge excess peaks of the particle's diffusion constant with a height that depends on the force orientation and intensity. In sharp contrast, the particle's mobility is isotropic and force independent. We relate such a nonlinear response of the system to the advection properties of the laminar flow in the suspension fluid.

Anisotropic Diffusion in Driven Convection Arrays

Marchesoni, Fabio
;
2021-01-01

Abstract

We numerically investigate the transport of a Brownian colloidal particle in a square array of planar counter-rotating convection rolls at high Peclet numbers. We show that an external force produces huge excess peaks of the particle's diffusion constant with a height that depends on the force orientation and intensity. In sharp contrast, the particle's mobility is isotropic and force independent. We relate such a nonlinear response of the system to the advection properties of the laminar flow in the suspension fluid.
2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/469279
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