Félicie Theron

IMT Atlantique | IMT · Department of Energy Systems and Environment (DSEE)

This study investigates experimentally the influence of the temporal airflow pattern properties to which microparticles are exposed on the dynamics of the resuspension phenomenon for transient airflow conditions representative of a fan start, i.e., involving a temporal acceleration period before reaching steady state. The extent to which the averag...

This work aims to study the influence of the airflow pattern properties on the evolution of microparticles behaviour with respect to time for fan accelerations followed by a short period of steady state. For that purpose, the transient evolution of the fraction of particles remaining on the duct wall is analysed as a function of time considering th...

The aim of the present study was to investigate the impact of the mean flow velocity on the Floating Treatment Wetland (FTW) roots' network behaviour and associated opportunity for suspended solids entrapment. The objective was to identify the appropriateness of a FTW to reduce turbidity in a retention pond subject to specific flow regimes. A flume...

This study combines experimental velocity measurements and numerical simulations to characterize the airflow in the vicinity of pleated filters used in ventilation systems. Experimental velocity and turbulence intensity profiles were measured using Hot Wire Anemometry (HWA), upstream and downstream of the filter. Significant local velocity gradient...

In this study a geometric anisotropic two-strut model is presented to predict the permeability of fibrous porous media subject to compression. A further novelty of this study is the inclusion of the Klinkenberg effect in the permeability prediction of the two-strut model and existing three-strut model. The specific surface area of the anisotropic m...

The purpose of this study is to develop an experimental methodology with relevant space and time resolutions to track the velocity properties responsible for the resuspension of microparticles during the acceleration stage of a fan start. Microparticles release is investigated over a time period of several seconds, i.e. at short time. This methodol...

The permeability prediction of real fibrous media remains a major challenge due to their complex porous structure. The existing models generally take two parameters into account that depict the average structural properties of fibrous media: porosity (or solid volume fraction) and fibre diameter (or radius). Due to the local variations that those p...

The present study focuses on complementary experimental methods to characterize the structural properties of a high performance composite medium made of a polymer membrane laminated to a fibrous support, and used for air filtration, at global and local scales. This two-scale approach aims to evaluate the in-plane homogeneity of the properties of th...

The aim of this study is to combine numerical and experimental approaches to evaluate the influence of pleat geometrical parameters on the performances of pleated fibrous filters in the depth filtration stage of submicronic aerosols. For a given raw filter, three different geometrical pleat configurations (with various pleat heights and widths) are...

When viscous fluids are involved, laminar hydraulic conditions and heat and mass transfer intensification are conflicting phenomena. A channel geometry based on Split-And-Recombine (SAR) patterns is experimentally investigated. The principle implements the Baker's transformation and ‘chaotic’ structures are generated to promote heat and mass transf...

The use of heat exchanger/reactors (hex/reactors) is a promising way to overcome the barrier of poor heat transfer in batch reactors. However to reach residence time long enough to complete the chemistry, low Reynolds number has to be combined with both a plug flow behaviour and the intensification of heat and mass transfers. This work concerns the...

A novel continuous process is proposed and investigated to produce microcapsules by interfacial polycondensation. Polymeric microcapsules are obtained via a two-step process including an initial emulsification of two immiscible fluids in static mixers and a subsequent interfacial polycondensation reaction performed in two different continuous react...

The aim of this paper is to investigate the influence of physico-chemical parameters on liquid–liquid dispersion at high dispersed phase concentration in Sulzer SMV™ mixer. Four different oil-in-water systems involving two different surfactants are used in order to evaluate the effect of interfacial tension, densities and viscosities ratio on mean...

Process intensification (PI) methodology, introduced in the 1980s, was recently defined1 as “any chemical engineering development that leads to a substantially smaller, safer, cleaner and more energy-efficient technology”. Among the numerous options to intensify a process, the transposition from a batch reactor to a continuous plug flow reactor is...

This paper deals with comparing performances of three different static mixers in terms of pressure drop generated by both single-phase flow and liquid–liquid flow in turbulent flow regime and in terms of emulsification performances. The three motionless mixers compared are the well-known SMX™ and SMV™ and the new version of the SMX called SMXPlus™....

This paper presents an experimental study of pressure drop of single-phase flow and liquid−liquid dispersion through a Sulzer SMX mixer in the turbulent flow regime. Emulsification experiments are performed with various numbers of mixing elements from 2 to 20 and different flow rates ranging from 204 to 600 L/h. Pressure drop in single phase flow w...

A process to produce continuously microcapsules made of polyurea shell and containing cyclohexane as oil phase is proposed. The polymeric microcapsules are obtained via a two-step process involving emulsification of two immiscible fluids in static mixers followed by interfacial polycondensation in an empty pipe. The use of static mixers in turbulen...

De nombreux produits encapsulés sont utilises dans la vie quotidienne. Crèmes cosmétiques, peintures, et pesticides en sont quelques exemples. De nos jours, de plus en plus de technologies innovantes mettent en jeu des substances encapsulées. La microencapsulation a permis a de nouveaux ≪ textiles intelligents ≫ de voir le jour, tels que les textil...