UNE ETUDE EXPERIMENTALE ET THEORIQUE D'UN ECOULEMENT DISPERSE EST FAITE DANS LE DOMAINE D'ENTREE D'UN CONDUIT CYLINDRIQUE HORIZONTAL. TROIS QUANTITES INITIALES DE LIQUIDE SONT INJECTEES DANS UN ECOULEMENT GAZEUX CARACTERISE PAR DES NOMBRES DE REYNOLDS DIFFERENTS. CETTE ETUDE EXPERIMENTALE EST REALISEE AVEC DEUX TYPES D'ENTREE DU CONDUIT: PROFILEE ET A BORD VIF. NOUS MONTRONS QUE LA FRACTION MASSIQUE DU LIQUIDE EN SUSPENSION EVOLUE LONGITUDINALEMENT DANS LE DOMAINE D'ENTREE. LA CHUTE DE PRESSION EN ECOULEMENT DISPERSE DEPEND DE LA FRACTION MASSIQUE INITIALE DU LIQUIDE INJECTE. NOUS PROPOSONS UNE MODELISATION D'ECOULEMENTS DIPHASIQUES A PARTIR D'UN MODELE D'ECOULEMENT MONOPHASIQUE. NOTRE MODELE TIENT COMPTE DE LA COUCHE LIMITE DYNAMIQUE, DE LA MODIFICATION DE LA TURBULENCE DE LA PAROI DUE A LA RUGOSITE DES GOUTTELETTES A L'INTERFACE ET DE LA TURBULENCE DANS LE CORPS POTENTIEL DUE A L'ENTREE A BORD VIF. NOUS COMPARONS LES VALEURS CALCULEES DES PARAMETRES CINETIQUES ET DYNAMIQUES DE L'ECOULEMENT TURBULENT AVEC NOS RESULTATS EXPERIMENTAUX AINSI QUE CEUX PRESENTES PAR D'AUTRES CHERCHEURS. LA CONCORDANCE THEORIE/EXPERIENCE DE CES VALEURS NOUS PERMET DE PROPOSER UNE RELATION D'EVALUATION DE LA CHUTE DE PRESSION DANS LE DOMAINE D'ENTREE D'ECOULEMENTS DISPERSES EN FONCTION DE LA FRACTION MASSIQUE INITIALE DU LIQUIDE INJECTE ET DU TYPE D'ENTREE DU CONDUIT. CETTE RELATION EST BASEE SUR CELLE PROPOSEE PAR SOLIMAN DANS LE DOMAINE ETABLI EN LUI APPORTANT DES MODIFICATIONS POUR POUVOIR L'APPLIQUER DANS LE DOMAINE D'ENTREE

LES EXPERIENCES EFFECTUEES ONT PORTE SUR CERTAINES CARACTERISTIQUES LOCALES ET GLOBALES DE L'ECOULEMENT SOLIDE-LIQUIDE EN CONDUITE HORIZONTALE. LES PRINCIPALES CARACTERISTIQUES ETUDIEES SONT: LA MESURE DU CHAMP DES VITESSES, LA DETERMINATION DE LA DISTRIBUTION DE CONCENTRATION DES PARTICULES SOLIDES EN SUSPENSION ET LA MESURE DE LA PERTE DE CHARGE; LA MESURE DE LA VITESSE DE GLISSEMENT LOCALE ET LA DETERMINATION SIMULTANEE DES PROFILS DE CONCENTRATION DU TRACEUR ET DES PARTICULES SOLIDES; LA PROPOSITION D'UN MODELE SOUS FORME D'UNE LOI A PUISSANCE ENGLOBANT TOUS LES PARAMETRES LOCAUX ET GLOBAUX POUR LA DETERMINATION DE LA VITESSE MOYENNE DE GLISSEMENT SOLIDE-LIQUIDE DE L'ECOULEMENT. CE TRAVAIL A NECESSITE UNE AMELIORATION DE LA METROLOGIE PARTICULIERE UTILISANT LA METHODE DE VELOCIMETRIE A ULTRASONS PULSES

This new edition of the near-legendary textbook by Schlichting and revised by Gersten presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with particular emphasis on the flow past bodies (e.g. aircraft aerodynamics). The new edition features an updated reference list and over 100 additional changes throughout the book, reflecting the latest advances on the subject.

Arid and semi-arid regions face major challenges in the management of scarce freshwater resources under pressures of population, economic development, climate change, pollution and over-abstraction. Groundwater is commonly the most important water resource in these areas. Groundwater models are widely used globally to understand groundwater systems and to guide decisions on management. However, the hydrology of arid and semi-arid areas is very different from that of humid regions, and there is little guidance on the special challenges of groundwater modelling for these areas. This book brings together the experience of internationally leading experts to fill a gap in the scientific and technical literature. It introduces state-of-the-art methods for modelling groundwater resources, illustrated with a wide-ranging set of illustrative examples from around the world. The book is valuable for researchers, practitioners in developed and developing countries, and graduate students in hydrology, hydrogeology, water resources management, environmental engineering and geography.

This didactic book presents the main elements of acoustics, aeroacoustics and vibrations. Illustrated with numerous concrete examples linked to solid and fluid continua, Acoustics, Aeroacoustics and Vibrations proposes a selection of applications encountered in the three fields, whether in room acoustics, transport, energy production systems or environmental problems. Theoretical approaches enable us to analyze the different processes in play. Typical results, mostly from numerical simulations, are used to illustrate the main phenomena (fluid acoustics, radiation, diffraction, vibroacoustics, etc.).

This book is a collection of extended papers based on presentations given during the SIMHYDRO 2014 conference, held in Sophia Antipolis in June 2014. It focuses on the modeling and simulation of fast hydraulic transients, on 3D modeling, and on uncertainties and multiphase flows. The book explores both the limitations and performance of current models and presents the latest developments based on new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It addresses the interests of practitioners, stakeholders, researchers and engineers active in this field.

Authority and Control in the Countryside looks at the economic, religious, political and cultural instruments that local and regional powers in the late antique to early medieval Mediterranean and Near East used to manage their rural hinterlands.