Advection and Taylor-Aris dispersion in rivulet flow

F. H. H. Al Mukahal, B. R. Duffy, S. K. Wilson

Research output: Contribution to journalArticle

4 Citations (Scopus)
46 Downloads (Pure)

Abstract

Motivated by the need for a better understanding of the transport of solutes in microfluidic flows with free surfaces, the advection and dispersion of a passive solute in steady unidirectional flow of a thin uniform rivulet on an inclined planar substrate driven by gravity and/or a uniform longitudinal surface shear stress are analysed. Firstly, we describe the short-time advection of both an initially semi-infinite and an initially finite slug of solute of uniform concentration. Secondly, we describe the long-time Taylor-Aris dispersion of an initially finite slug of solute. In particular, we obtain the general expression for the effective diffusivity for Taylor-Aris dispersion in such a rivulet, and discuss in detail its different interpretations in the special case of a rivulet on a vertical substrate.
Original languageEnglish
Article number20170524
Number of pages22
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume473
Issue number2207
DOIs
Publication statusPublished - 15 Nov 2017

Keywords

  • mathematical modelling
  • advection
  • Taylor-Aris dispersion
  • rivulet

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