ETUDE EXPERIMENTALE DE LA CONFIGURATION STRATIFIEE LIQUIDE-GAZ PDF Download
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Author: FAROUK.. AL SAMMERAI
Publisher:
ISBN:
Category :
Languages : fr
Pages : 192
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Book Description
ETUDE DE L'ECOULEMENT LIQUIDE-GAZ EN CONDUITE CIRCULAIRE HORIZONTALE OU FAIBLEMENT INCLINEE. MESURE DES PARAMERES A L'EQUILIBRE ET ETUDE DES SITUATIONS TRANSITOIRES CONDUISANT AU DECLANCHEMENT DE BOUCHONS DE LIQUIDE OU A L'ARRACHEMENT DE GOUTTELETTES EN FONCTION DES DEBITS ET DE LA PENTE
Author: FAROUK.. AL SAMMERAI
Publisher:
ISBN:
Category :
Languages : fr
Pages : 192
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Book Description
ETUDE DE L'ECOULEMENT LIQUIDE-GAZ EN CONDUITE CIRCULAIRE HORIZONTALE OU FAIBLEMENT INCLINEE. MESURE DES PARAMERES A L'EQUILIBRE ET ETUDE DES SITUATIONS TRANSITOIRES CONDUISANT AU DECLANCHEMENT DE BOUCHONS DE LIQUIDE OU A L'ARRACHEMENT DE GOUTTELETTES EN FONCTION DES DEBITS ET DE LA PENTE
Author: Tahar Triki
Publisher:
ISBN:
Category :
Languages : fr
Pages : 214
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Book Description
Author: Amir Aleem Hashmi
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832532285
Category : Science
Languages : en
Pages : 162
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Book Description
Aero engine bearing chambers are complex machine elements inside the engines, supporting up to three concentric shafts on bearings. For safety reasons, the aero engines always employ rolling-element type bearings and therefore require a sufficient oil supply for lubrication in order to guarantee a reliable operation. As a consequence, a complex two-phase flow consisting of oil and sealing air governs the bearing chambers. A highly dynamic oil film, flowing along the chamber walls, plays a vital role to fulfill the tasks of cooling, lubricating and cleaning the bearing chambers. The design and optimization process of the bearing chambers requires a detailed understanding in order to accurately simulate the film behaviour inside the bearing chambers. Based on the earlier experimental investigations, it is known that near the scavenge off-take a relatively thick film exists. The numerical model to simulate these films must therefore take into account the elliptical behaviour of such films. Among the different models, the Volume Of Fluid (VOF) Model offers the best compromise between accuracy and efforts. However, preliminary attempts to model a fully developed and turbulent test case from literature revealed an unphysical pressure drop and velocity profile in the gas phase above the film flow. An inadequate turbulence modelling near the gas-liquid interface was identified as the problem source. The 2-Equation turbulence models (k- epsilon & k- omega) were extended to achieve a substantial improvement.
Author: Jean-Michel Rosant
Publisher:
ISBN:
Category :
Languages : fr
Pages : 286
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Book Description
Author: RAMIRO GORDILLO.. GARCIA
Publisher:
ISBN:
Category :
Languages : fr
Pages : 100
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Book Description
ETUDE EXPERIMENTALE ET CONSTRUCTION D'UN MODELE MATHEMATIQUE PERMETTANT LE CALCUL DU TAUX DE GAZ EN TENANT COMPTE DES PHENOMENES, DE DEPLACEMENT SUCCESSIF D'UNE POCHE DE GAZ ET D'UN BOUCHON LIQUIDE DANS LA CONDUITE ET DE PRESENCE DE GAZ (BULLES) DANS LE BOUCHON. DISTRIBUTIONS SPATIALES ET PROFILS VERTICAUX MOYENS DU TAUX DE POCHE ET DU TAUX DE BULLES
Author: Armando Dominguez
Publisher:
ISBN:
Category :
Languages : fr
Pages : 162
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Book Description
LE TRAVAIL PRESENTE DANS CE MEMOIRE CONCERNE L'ETUDE DE LA FORMATION ET DE LA CROISSANCE D'UNE PHASE GAZEUSE PAR DECOMPRESSION D'UN LIQUIDE SURSATURE EN GAZ AU SEIN D'UN MILIEU POREUX. LA MAITRISE DE CETTE SITUATION, QUI SE RENCONTRE LORS DE L'EXPLOITATION DE CERTAINS GISEMENTS DE PETROLE OU GEOTHERMIQUES, EST TOUT A FAIT CAPITALE POUR TRAITER CONVENABLEMENT LES HISTORIQUES DE PRODUCTION DE MASSE OU D'ENERGIE. INSCRIT DANS LA CONTINUITE DES ETUDES ANTERIEUREMENT DEVELOPPEES SUR LE SUJET AU SEIN DE L'INSTITUT DE MECANIQUE DES FLUIDES DE TOULOUSE, LE PRESENT TRAVAIL S'EFFORCE DE REPONDRE A DEUX OBJECTIFS: PREMIEREMENT, COMPLETER L'INVESTIGATION EXPERIMENTALE DEJA EFFECTUEE, EN UTILISANT UNE GAMME PLUS LARGE DE SOLUTIONS, AFIN D'EVALUER NON SEULEMENT L'INFLUENCE DU NOMBRE DE JACOB ET DU TAUX DE DECOMPRESSION MAIS EGALEMENT DE LA MOUILLABILITE ET DE LA GRAVITE SUR LES PHENOMENES ETUDIES, DEUXIEMEMENT, PROPOSER DES MODELES DE SIMULATION NUMERIQUE OFFRANT DES POSSIBILITES D'ANALYSE ET DE PREDICTION AUSSI BIEN DE LA FORMATION DE LA PHASE GAZEUSE (NUCLEATION) QUE DE SA CROISSANCE. POUR DEVELOPPER CE PROGRAMME, EN L'OCCURENCE LIMITE A LA CONFIGURATION 2D (AFIN DE POUVOIR ASSOCIER AUX DONNEES QUANTITATIVES DES OBSERVATIONS PHENOMENOLOGIQUES) ET AUX REGIMES PRINCIPALEMENT CONTROLES PAR LA CAPILLARITE ET LA DIFFUSION MOLECULAIRE (AFIN D'EVITER LA COMPLEXITE DU COUPLAGE DES PHENOMENES HYDRODYNAMIQUES ET MASSIQUES DANS LA SIMULATION NUMERIQUE) DIFFERENTS MOYENS METHODOLOGIQUES ONT ETE ADAPTES, DEVELOPPES ET EVALUES. CES MOYENS CONCERNENT: DU POINT DE VUE EXPERIMENTAL: L'IMPLANTATION D'UN SYSTEME D'ACQUISITION ET DE TRAITEMENT D'IMAGES PERMETTANT LE SUIVI INSTANTANE DE L'APPARITION DES BULLES DE GAZ ET DE LEUR CROISSANCE, DU POINT DE VUE NUMERIQUE: LA CONCEPTION D'UN AUTOMATE PERMETTANT DE REPRODUIRE LA LOCALISATION SPATIALE DES SITES DE NUCLEATION ET SURTOUT LA CROISSANCE DES AMAS GAZEUX. OUTRE LA CONFIRMATION DES MECANISMES DE FORMATION DE LA PHASE GAZEUSE: PREEXISTENCE DE BULLES, PIEGEAGE CAPILLAIRE, ACTIVATION SEQUENTIELLE DES SITES ET CROISSANCE PAR DIFFUSION, LES RESULTATS EXPERIMENTAUX ONT PERMIS DE DISTINGUER ET DE QUANTIFIER LES CONSEQUENCES DE LA SURSATURATION DU MOUILLAGE ET DE LA GRAVITE SUR LA CROISSANCE DE LA PHASE GAZEUSE. LES LOIS OBTENUES SONT TRES DIFFERENTES DE CELLES CONNUES HORS MILIEU POREUX. COMME L'INDIQUE L'ETUDE DE CERTAINS FACTEURS GEOMETRIQUES, ISSUS DE L'ANALYSE D'IMAGES, CES DIFFERENCES SONT FORTEMENT CORRELEES AVEC L'EVOLUTION SPECIFIQUE DE L'AIRE INTERFACIALE, GAZ-LIQUIDE, AU SEIN DE LA MICROSTRUCTURE. LA SIMULATION DU PROCESSUS DE CROISSANCE D'UN AMAS GAZEUX ET D'ENVAHISSEMENT DU MILIEU POREUX A ETE EFFECTUEE A L'AIDE D'UN AUTOMATE NUMERIQUE CONSTRUIT A PARTIR DES OBSERVATIONS, ANALYSES ET INTERPRETATIONS DES PHENOMENES A L'ECHELLE DES PORES. FONDE SUR UNE SUCCESSION D'
Author: Geoffrey Frederick Hewitt
Publisher: Chem/Mats-Sci/E
ISBN:
Category : Science
Languages : en
Pages : 624
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Book Description
This volume in the series on heat and mass transfer encompasses papers presented at a conference in Dubrovnik in 1990. The topics covered include the physical interactions between phases and their interface, waves on interfaces, coalescence phenomena and surface tension and surfactant effects.
Author: Don Montague
Publisher: Taylor & Francis
ISBN: 9780419199106
Category : Architecture
Languages : en
Pages : 472
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Book Description
This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Author:
Publisher:
ISBN:
Category : Nuclear fuels
Languages : en
Pages : 304
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Book Description
Author: W. Brutsaert
Publisher: Springer Science & Business Media
ISBN: 9789027716972
Category : Science
Languages : en
Pages : 666
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Book Description
The transfer across the surface of environmental waters is of interest as an important phase in the geophysical and natural biochemical cycles of numer ous substances; indeed it governs the transition, one way or the other, be tween the dissolved state in the water and the gaseous state in the atmo sphere. Especially with increasing population and industrialization, gas transfer at water surfaces has become a critical factor in the understanding of the various pathways of wastes in the environment and of their engineering management. This interfacial mass transfer is, by its very nature, highly complex. The air and the water are usually in turbulent motion, and the interface be tween them is irregular, and disturbed by waves, sometimes accompanied by breaking, spray and bubble formation. Thus the transfer involves a wide variety of physical phenomena occurring over a wide range of scales. As a consequence, scientists and engineers from diverse disciplines and problem areas, have approached the problem, often with greatly differing analytical and experimental techniques and methodologies.
