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

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

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)2359-2368
Number of pages10
JournalAIChE Journal
Volume50
Issue number10
DOIs
StatePublished - Oct 2004

Keywords

  • Curved channels
  • Scalar mixing

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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