Le CO2 mis en cage avec une technologie innovante

Le CO2 mis en cage avec une technologie innovante (2015). Magazine Émergences – Les faits marquants de la recherche à l’UPP

Rapport d’activité Institut Carnot ISIFoR 2015-2016: développement d'une nouvelle cellule calorimétrique haute pression agitée

Les 10 ans des Instituts Carnot (2016). Rapport d’activité Institut Carnot ISIFoR 2015-2016. Les faits marquants en 2015-2016. Cellule agitée MIXCEL

Plateforme CATHY : Plateforme experimentale multi-échelle pour l’étude et la caractérisation d’hydrates de gaz

Plateforme CATHY : Plateforme experimentale multi-échelle pour l’étude et la caractérisation d’hydrates de ga

MIXCEL : des calorimètres plus performants pour déterminer les propriétés de fluides complexes sous pression

MIXCEL : des calorimètres plus performants pour déterminer les propriétés de fluides complexes sous pression (2013). Rapport d’activité Aquitaine Science Transfert (septembre 2012, décembre 2013). Chapitre 3.6 : Energie-Filières verte

Une cellule calorimétrique innovante pour mieux étudier les hydrates de gaz

Une cellule calorimétrique innovante pour mieux étudier les hydrates de gaz (2015). Les 10 ans des Instituts Carnot. 23 septembre 2015, Bibliothèque nationale de France, Pari

ISIFoR livre les secrets des hydrates de gaz

ISIFoR livre les secrets des hydrates de gaz (2015). Les instituts Carnot : la recherche pour les entreprises. Association Instituts Carnot

An experimental and CFD study of liquid jet injection into a partially baffled mixing vessel: a contribution to process safety by improving the quenching of runaway reactions

Thermal runaway remains a problem in the process industries with poor or inadequate mixing contributing significantly to these incidents. An efficient way to quench such an uncontrolled chemical reaction is via the injection of a liquid jet containing a small quantity of a very active inhibiting agent (often called a stopper) that must be mixed into the bulk of the fluid to quench the reaction. The hazards associated with such runaway events mean that a validated computational fluid dynamics (CFD) model would be an extremely useful tool. In this paper, the injection of a jet at the flat free surface of a partially baffled agitated vessel has been studied both experimentally and numerically. The dependence of the jet trajectory on the injection parameters has been simulated using a single-phase flow CFD model together with Lagrangian particle tracking. The comparison of the numerical predictions with experimental data for the jet trajectories shows very good agreement. The analysis of the transport of a passive scalar carried by the fluid jet and thus into the bulk, together with the use of a new global mixing criterion adapted for safety issues, revealed the optimum injection conditions to maximise the mixing benefits of the bulk flow pattern

An experimental and computational study of the vortex shape in a partially baffled agitated vessel

The vortex shape in a non-standard partially baffled agitated vessel in the form of a glass-lined, under-baffled stirred vessel has been investigated using both experimental and numerical approaches for an air/water system for different rotation speeds of the agitator. A simple and flexible experimental strategy was developed for determination of the time-averaged location of the unstable free surface using a process involving superimposition of images. CFD simulations were made to predict the vortex shape by using an Eulerian–Eulerian multiphase model coupled with a homogenous turbulence model. The simplifying assumptions of a constant bubble size, a constant drag coefficient and use of the k–ε turbulence model were made. An assessment of the capability of the numerical method to predict the vortex shape was carried out through comparison between experimental data and numerical results. Considering for comparison purposes a water isosurface volume fraction equal to 0.9, to account for the existence of air/water mixture present at the interface in the experiments, instead of the classical value of 0.5, gave very good agreement with the experimental data

Quenching runaway reactions : hydrodynamics and jet injection studies for agitated reactors with a deformed free-surface

To quench a thermal runaway reaction in a chemical rector, an efficient approach is the introduction of a small quantity of a liquid inhibiting agent, named a “killer”, into the mixing vessel. In this thesis, an experimental approach has been coupled tightly with numerical modelling using Computational Fluid Dynamics (CFD). The first part of this thesis is devoted to a study of the hydrodynamics of partially-baffled mixing vessels, including the free-surface deformation caused by the central vortex. The use of an inhomogeneous, multiphase approach allowed simulation of the free-surface deformation. The capability of this novel method was demonstrated by very good agreement between the numerical predictions and experimental data. In the second part, liquid jet injection at the free-surface was coupled with the vessel hydrodynamics. Numerical results, obtained using an Eulerian-Lagrangian approach, have again shown good agreement with experimental data. These results allowed the jet trajectory to be modelled and its penetration into the agitated vessel was quantified. New mixing criteria were introduced that are specific to this application. Finally, the numerical methods validated at the pilot scale were applied at the industrial scale and allowed the proposal of practical improvements to the safety of the synthesis reactors studie

Plateforme CATHY

Catalogue plateforme Filière Extra & Co : « Des compétences et des moyens techniques au service de la filière Industries Extractives et Première Transformation. Plateforme expérimentale multi-échelles pour l’étude et la CAracTérisation d’HYdrates de ga