Eric Foucault

Université de Poitiers | UP · Institut de recherche de Poitiers : Recherche ingénierie en matériaux, mécanique et énergétique pour les transports, l'énergie et l'environnement (Institut Pprime)

In an attempt to redefine and improve the ISO9300 norm, it is possible to see the emergence of a universal (Cd) curve. For this, all the influential factors must be correctly understood within their range of variation. In recent discussions, the experimental calibration point could be limited, and a low-pressure measurement could be sufficient to e...

An original method is presented to measure time resolved unsteady flow rate. From the kinetic energy theorem, the balance equation of the kinetic energy is integrated on a conical control volume (Venturi type). A non-linear ODE is obtained, simple enough to be resolved in real-time (that is to say in less than one time step). The two coefficients o...

This paper describes a part of a research project aimed at reducing the uncertainty of the determination of the CFVN discharge coefficient. In the current state of the work, there are two parallel studies: an experimental and a numerical. Experiments have been carried out to determine the impact of roughness on the CD and to demonstrate the need fo...

Visualizations by light amplification by stimulated emission of radiation (laser) tomographies have allowed the study of the flow resulting from the interaction between a circular jet and a cross boundary layer. This type of flow is dominated by the presence of many complex vortices that come from the recombining of the vorticity created in the inj...

Transition to turbulence for an acoustically oscillating flow (without any mean motion) in a resonant wave guide is considered. Departure from the laminar behaviour of the Stokes boundary layer formed in the near wall region is studied both experimentally and numerically for increasing acoustic levels. Laser Doppler Velocimetry is used to measure v...

A promising alternative to the use of conventional mechanical ventilators to treat pulmonary syndromes such as acute respiratory distress and meconium aspiration consists of employing total liquid ventilators, an experimental device which uses an oxygenated perfluorochemical liquid instead of a gas mixture of air and oxygen. Liquid ventilator devel...

An unsteady flowmeter was developed for implementation in the Inolivent-4 total liquid ventilator prototype. The proposed design consists of a symmetrical venturi tube comprising three pressure sensors and in which flow measurement is obtained by numerically solving a slightly modified version of the unsteady Bernoulli equation. A prototype was val...

Le jet annulaire tournant permet le mélange particulièrement efficace de fluides et se rencontre fréquemment dans des applications variées du génie des procédés (e.g. combustion). Des résultats expérimentaux sont comparés à une analyse de stabilité linéaire spatio-temporelle. Des progrès significatifs ont été récemment accomplis grace à l'étude de...

Brevet Français (déposants CNRS, Université de Poitiers), n° 0852026, 28 mars 2008.

Rapport final du contrat CNRS/Université de Poitiers n° 781936 - CHU - Association CoeurPlus, 2008.

This paper concerns the stability of the von Kármán swirling flow between coaxial disks. A linear stability analysis shows that for moderate Reynolds numbers ($Re\le50$) and for any rotation ratio $s\in[-1,1[$ there is a radial location $r_{pc}$ from which the self-similar von Kármán solutions become unstable to axisymmetric disturbances. When the...

The bifurcations and the nonlinear dynamics of the von Kármán swirling flow between exactly counter-rotating disks in a stationary cylinder are numerically and experimentally investigated. The dynamics are governed by two parameters, the radius-to-height ratio A = R / H and the Reynolds number, Re, based on disk rotation speed and cylinder height....

Contrat UP/Renault n° 781705, 2006.

Experimental investigations of near-field structure of coaxial flows are presented for four different configurations: coaxial jets without rotation (reference case), outer flow rotating only (OFRO), inner-jet rotating only (IJRO) and corotating jets (CRJ). The investigations are performed in a cylindrical water tunnel, with an independent rotation...

Rapport du contrat de collaboration de recherche n° 781027 entre Hispano-Suiza, le CNRS, l'Université de Poitiers et l'UMR CNRS 6609

An experimental investigation of film cooling of a wall in a case of double rows of staggered hot jets (65 degrees C) in an ambient air flow. The wall is heated at a temperature value between the one of the jets and the one of the main flow. Experiments have been carried out for different injection rates, the main flow velocity is maintained at 32...

The aim of this study is the characterization of the cylindrical mixing layer resulting from the interaction of two coaxial swirling jets. The experimental part of this study was performed in a cylindrical water tunnel, permitting an independent rotation of two coaxial jets. The rotations are generated by means of 2×36 blades localized in two swirl...

The structure of the flow generated by the interaction of a circular jet and a transverse boundary layer has been studied by means of visualizations, realized by LASER tomography, and velocity measurements, obtained by LASER anemometry. In this study we have made an inventory of the different kinds of observed vortices, then we have tried to specif...

The recent developments in the field of Advanced Oxidation Processes (AOP) require improvements in reactor design. Indeed, light-induced procedures cannot be used for the removal of micropollutants in strong absorbing solutions. In this work, the technical design concept for mixing in a cylindrical reactor has been approached in a rational way for...

Visualisations by LASER topographies and velocity measurements by LDV have allowed the study of the flow resulting from the interaction between a circular jet and a cross boundary layer. This type of flow is dominated by the presence of many complex vortices that come from the recombining of the vorticity created in the injection tube and that crea...

The recent developments in the field of Advanced Oxidation Processes (AOP) require improvements in reactor design. Indeed, light-induced procedures cannot be used for the removal of micropollutants in strong absorbing solutions. In this work, the technical design concept for mixing in a cylindrical reactor has been approached in a rational way for...

Visualizations by light amplification by stimulated emission of radiation (laser) tomographies have allowed the study of the flow resulting from the interaction between a circular jet and a cross boundary layer. This type of flow is dominated by the presence of many complex vortices that come from the recombining of the vorticity created in the inj...