Numerical study of scalar mixing in curved channels at low Reynolds numbers

S. P. Vanka; G. Luo; C. M. Winkler

doi:10.1002/aic.10196

Numerical study of scalar mixing in curved channels at low Reynolds numbers

S. P. Vanka, G. Luo, C. M. Winkler

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78 Scopus citations

Abstract

A computational study has been performed to determine the rates of mixing in a curved square duct at low Reynolds numbers of interest to microfluidic applications. Two flow streams with inlet scalar concentrations of zero and unity in the two halves of a duct perpendicular to the plane of curvature were allowed to mix by convection and diffusion. Concentration distributions and unmixedness coefficients are presented for several Reynolds and Schmidt numbers and are compared with values for a straight channel of equivalent length. It is seen that for large Schmidt number fluids, mixing is considerably enhanced at moderately low Reynolds numbers (Re ∼ 10), but is not enhanced at Reynolds numbers of the order of 0.1.

Original language	English (US)
Pages (from-to)	2359-2368
Number of pages	10
Journal	AIChE Journal
Volume	50
Issue number	10
DOIs	https://doi.org/10.1002/aic.10196
State	Published - Oct 2004

All Science Journal Classification (ASJC) codes

Biotechnology
Environmental Engineering
General Chemical Engineering

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AB - A computational study has been performed to determine the rates of mixing in a curved square duct at low Reynolds numbers of interest to microfluidic applications. Two flow streams with inlet scalar concentrations of zero and unity in the two halves of a duct perpendicular to the plane of curvature were allowed to mix by convection and diffusion. Concentration distributions and unmixedness coefficients are presented for several Reynolds and Schmidt numbers and are compared with values for a straight channel of equivalent length. It is seen that for large Schmidt number fluids, mixing is considerably enhanced at moderately low Reynolds numbers (Re ∼ 10), but is not enhanced at Reynolds numbers of the order of 0.1.

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Numerical study of scalar mixing in curved channels at low Reynolds numbers

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