Catégorie : Flow visualization

Nicolas DietrichChemical Engineering

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., […]

Nicolas DietrichChemical Engineering

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 […]

Nicolas DietrichChemical Engineering

Vizualization of hydrodynamics around a bubble by Kalliroscopic techniques

Vizualization of hydrodynamics around a bubble by Kalliroscopic techniques Visualisation de l’hydrodynamique autour d’une bulle en ascension dans une cellule de Hele-Shaw Property of Milnes, Kherbeche, Jimenez, Dietrich, Lheklif and Hérard (2012) La solution utilisee est un mélange contenant 50% d’eau démineralisée et 50% de Kalliroscope AQ-1000, une suspension de 1 a 2% de paillettes […]

Nicolas DietrichChemical Engineering

Multi-scale analysis of physicochemical parameters on the hydrodynamic and gas-liquid mass transfer in thriphasic reactor

Property of Abderrahmane Kherbechea, Nicolas Dietrich, Gilles Hébrard and Brahim Lekhlif; 2012 The use of three-phasic reactors in industrial sector remains, today, the priority of lot of researches around the world,  three-phasic reactors, so-called biofilters in wastewater treatment domain, are widely used for their efficiency and their small plug of space. Therefore, the main objective […]