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A new fluorescence method for measuring cross‐fluctuation fo two non‐reactive components in a mixing device
Author(s) -
André Christophe,
David René,
Villermaux Jacques,
André JeanClaude
Publication year - 1992
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270150306
Subject(s) - tracer , fluorescence , mixing (physics) , chemistry , analytical chemistry (journal) , laser induced fluorescence , intensity (physics) , linear correlation , biological system , optics , chromatography , physics , mathematics , nuclear physics , statistics , quantum mechanics , biology
Abstract A novel method for measuring local deviations from perfect mixing of two non‐reative tracers is presented. It is based on the partially quenched fluorescence of one fluorescent tracer by a second tracer. When the concentration fluctuations are small, the deviation from the linear behaviour yields the cross‐correlation of the fluctuating components of the concentrations of both traces from an – easy to record – average value of fluorescence intensity obtained in the focus of a laser beam. The method was proven to be suitable for measuring these quantities in a 1125 cm 3 well‐stirred tank as a function of location and stirring speed.