Local investigation of the gas-liquid mass transfer using oxygen sensitive dye. A single vortex leg enclosing transferred oxygen in the confined sliding bubble wake. Angle of inclination of upper wall inclination affects mass transfer. A scaling law between Sherwood numbers and modified Archimedes numbers. Abstract An experimental investigation of gas-liquid mass transfer in the wake of a confined air […]
Abstract This paper presents a demonstration of the visualization and the characterization of gas–liquid mass transfer in a small bubbly column. The aim is to show how simple experiments can be used to directly quantify mass transfer without the need of sophisticated probes or complex titrations. The method here proposed is based on the “red […]
New paper : Mass transfer and diffusion in the wake of single air bubbles rising in polymer aqueous solutions quantified by PLIF with inhibition Based on the planar laser-induced fluorescence with inhibition (PLIF-I) experiments, the mass transfer and diffusion phenomena in the wake of single air bubbles (equivalent diameter ∼ 1–1.4 mm) rising in various aqueous […]
Invited conference: Visualization of gas-liquid mass transfer around bubbles, N. Dietrich, M. Jimenez, M. Mei, L. Yang, F. Felis, F. Xu, K. Loubière & G. Hébrard, Xi’an Jiatong University, Meeting Room 2, School of Aerospace, October the 16th 2018, China Abstract: Mass transfer in gas/liquid systems is of prime interest for several areas (medicine, chemical […]
Our work, titled « Visualization of mass transfer around a bubble swarm in a 2D Hele-Shaw Cell » (Personnal Communication, 2012), has been selected for the cover of Chem. Eng. Technol. 8/2017 (page 1379). DOI: 10.1002/ceat.201770081 Copyright: Hamburg University of Technology and Fédération de Recherche FERMAT – University of Toulouse
Visualization of mass transfer is a powerful tool to improve understanding of local phenomenon. The use of an oxygen-sensitive dye (colorimetric technique) (Dietrich et al., Chem Eng Sci. 2013; 100:172–182) has showed its relevancy for locally visualizing and characterizing gas–liquid mass transfer at different scales (Kherbeche et al., Chem Eng Sci. 2013; 100: 515–528; Yang et al., […]
By : N. DIETRICH, J. FRANCOIS, M. JIMENEZ, A. COCKX, P. GUIRAUD, G. HEBRARD Abstract: 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 concentration field at micro-scale in the laminar bubble wake. The […]
By Mélanie Jimenez, Nicolas Dietrich, John R. Grace, Gilles Hébrard Abstract: Powerful techniques, based on the Planar Laser Induced Fluorescence (PLIF) technique, are deployed to locally visualize and quantify the impact of surfactants in wastewaters on hydrodynamics and oxygen mass transfer. Bubble diameter, aspect ratio, rise velocity, contamination angle, as well as flux, flux density, […]
