Peripheral mixing of passive scalar at small Reynolds number

Details Peripheral mixing of passive scalar at small Reynolds number Peripheral mixing of passive scalar at small Reynolds number

2008-11-27

arxiv.org/abs/0811.4519v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 5 figures

Scientific paper

Mixing of a passive scalar in the peripheral region close to a wall is investigated by means of accurate direct numerical simulations of both a three-dimensional Couette channel flow at low Reynolds numbers and a two-dimensional synthetic flow. In both cases, the resulting phenomenology can be understood in terms of the theory recently developed by Lebedev and Turitsyn [Phys. Rev. E 69, 036301, 2004]. Our results prove the robustness of the identified mechanisms responsible for the persistency of scalar concentration close to the wall with important consequences in completely different fields ranging from microfluidic applications to environmental dispersion modeling.

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