Abstract N-alkyl-D-galactonamides give biocompatible hydrogels that are very delicate and not injectable. To circumvent their mechanical fragility and the injectability issue, we have developed a method of injection based on solvent-water exchange. A solution of the gelator in a good solvent is injected vertically in a bath of water. The diffusion of water inside the solvent jet […]
Abstract This article focuses on the study of the mass transfer involved in the application of a bacterial antifouling technique for membrane bioreactors (MBR), via the addition of solid media. These alginate objects can contain a biological system capable of producing an enzyme that degrades the signal molecules responsible for membrane fouling. The objective of […]
The influence of viscosity and surface tension on oxygen transfer was investigated using planar laser-induced fluorescence with inhibition (PLIF-I). The surface tension and the viscosity were modified using Triton X-100 and polyacrylamide, respectively. Changes in the hydrodynamic parameters of millimetric bubbles were identified, and transfer parameters were calculated. The results revealed a decrease in the […]
Abstract Gas–liquid mass transfer was investigated around Taylor bubbles flowing in a long, in-plane, spiral-shaped milli-reactor involving various configurations. Using a colorimetric technique and image post-treatment, the variation of the equivalent O2 concentration inside the liquid slugs was measured. The coloration positions, corresponding to 99% of the maximum concentration reached in the liquid slug, changed significantly […]
Abstract An experimental investigation of gas–liquid Taylor flows in a millimetric in-plane spiral shaped reactor with various tube curvature ratios (52 < λ < 166) is reported. Thanks to the compactness of the reactor and the use of an ad hoc imaging system and processing, the axial evolution of bubble lengths and velocities could be […]
Abstract In this article three different techniques for visualizing gas-liquid mass transfer are reviewed according to their applications in air-water systems. The three techniques are: Planar Laser Induced Fluorescence (PLIF with the use of fluorescent resorufin), PLIF with Inhibition (PLIF-I with the use of a ruthenium complex), and a colorimetric technique (using a redox reaction […]
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 […]
