2019: Hydrodynamics and gas-liquid mass transfer around a confined sliding bubble

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 […]

2019: Using the “Red Bottle” Experiment for the Visualization and the Fast Characterization of Gas–Liquid Mass Transfer

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 […]

2018: Mass transfer and diffusion in the wake of single air bubbles rising in polymer aqueous solutions quantified by PLIF with inhibition

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 […]

2018 : Visualization of gas-liquid mass transfer around bubbles

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 […]

2016 : Optical Methods to Investigate the Enhancement Factor of an 2 Oxygen-Sensitive Colorimetric Reaction Using Microreactors

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., […]

2015 : FAST MEASUREMENTS OF GAS-LIQUID DIFFUSION COEFFICIENT IN THE GAUSSIAN WAKE OF A SPHERICAL BUBBLE

    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 […]