Using non-intrusive laser-induced fluorescence in the characterisation of mixing in an oscillatory baffled column

A. W. Fitch, X. Ni

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Traditionally the characterisation of mixing in a system is achieved by injecting a tracer solution and monitoring the changes of tracer concentration with time using conductivity probes. In this paper we demonstrate that a non-intrusive laser-induced fluorescence (LIF) technique can be used to quantify the behaviour of viscous fluids in a model oscillatory baffled column (OBC). The OBC is an alternative-mixing device in which longitudinal periodic fluid oscillations are transposed onto a column with evenly spaced 'doughnut' shaped baffles. This combination of baffles and oscillation generates an enhanced yet uniform mixing system. In LIF, a dye fluoresces when it is induced by a laser. The intensity of the light emitted can be converted into the concentration of the dye. The timed profile of average concentration (within a baffled cell) leads to the determination of the mixing time and axial dispersion coefficient. This paper attempts to show that LIF is a powerful tool in studying mixing. © 2003 Society of Chemical Industry.

Original languageEnglish
Pages (from-to)326-331
Number of pages6
JournalJournal of Chemical Technology and Biotechnology
Volume78
Issue number2-3
DOIs
Publication statusPublished - Feb 2003

Keywords

  • Axial dispersion coefficient
  • Laser-induced fluorescence
  • Mixing time
  • Oscillatory baffled column

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