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Peripheral mixing of passive scalar at small Reynolds number

Published online by Cambridge University Press:  10 April 2009

G. BOFFETTA ,
F. DE LILLO  and
A. MAZZINO
G. BOFFETTA*
Affiliation:
Dipartimento di Fisica Generale and INFN, Università di Torino, Via P. Giuria 1, 10125 Torino, Italy CNR-ISAC, Sezione di Torino, corso Fiume 4, 10133 Torino, Italy
F. DE LILLO
Affiliation:
Dipartimento di Fisica Generale and INFN, Università di Torino, Via P. Giuria 1, 10125 Torino, Italy
A. MAZZINO
Affiliation:
Dipartimento di Fisica, Università di Genova, INFN and CNISM, Via Dodecaneso 33, 16146 Genova, Italy
*
†E-mail address for correspondence: [email protected]
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Abstract

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 & Turitsyn (Phys. Rev. E, vol. 69, 2004, 036301). 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 modelling.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 624 , 10 April 2009 , pp. 151 - 158
Copyright
Copyright © Cambridge University Press 2009

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References

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