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Fast Measurements of the Gas‐Liquid Diffusion Coefficient in the Gaussian Wake of a Spherical Bubble
Author(s) -
Dietrich Nicolas,
Francois Jessica,
Jimenez Mélanie,
Cockx Arnaud,
Guiraud Pascal,
Hébrard Gilles
Publication year - 2015
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.201400471
Subject(s) - wake , bubble , diffusion , laminar flow , thermal diffusivity , mechanics , quenching (fluorescence) , gaussian , chemistry , thermodynamics , materials science , analytical chemistry (journal) , physics , optics , chromatography , fluorescence , computational chemistry
A fast method is proposed for determining the oxygen gas‐liquid diffusion coefficient from measurements of the fluorescence quenching behind a bubble. The approach consists of capturing pictures of the concentration field at micro‐scale in the laminar bubble wake. The Gaussian concentration profiles measured in the wake are demonstrated to be systematically equivalent to an instantaneous plane diffusion case. The approach permits to accurately evaluate the gas‐liquid diffusivity in a very short time of around one second.