Experimental study of O2 diffusion coefficient measurement at a planar gas–liquid interface by planar laser-induced fluorescence with inhibition

Melanie Jimenez, Nicolas Dietrich, Arnaud Cockx, Gilles Hebrard

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

A new method for determining the molecular diffusivity of oxygen in liquids is described. The technique was applied through a flat air–liquid interface in a Hele-Shaw cell (5 × 5 × 0.2 cm3) and was based on planar laser-induced fluorescence (PLIF) with inhibition. A ruthenium complex (C72H48N8O6Ru) was used as the fluorescent dye sensitive to oxygen. A mathematical analysis was developed to determine the molecular diffusivity of oxygen simply by localizing the gas diffusion front. The specificity of this mathematical analysis is that it does not require the properties of the fluids (such as the saturation concentration) to be considered, which is especially relevant for complex media that are sometimes difficult to characterize properly. This technique was applied to three different fluids (viscosities ranging from 1 to 2.4 mPa·s) corresponding to binary diffusion coefficients ranging from 9.5 × 10−10 to 2 × 10−9 m2/s. Experimental data were found with an uncertainty of about 5% and were in good agreement with the literature. Particle image velocimetry and numerical simulations were also carried out to determine the optimal gas flow rate (0.01 L/s) to reach purely diffusive transfer, and the corresponding hydrodynamic profiles of the two phases
Original languageEnglish
Pages (from-to)325–333
Number of pages9
JournalAIChE Journal
Volume59
Issue number1
Early online date27 Apr 2012
DOIs
Publication statusPublished - Jan 2013

Keywords

  • mass transfer
  • diffusion
  • PIV
  • PLIF

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