TRANSFERT DE MATIERE ET DE CHALEUR PARTICULE-LIQUIDE EN LIT FLUIDISE GAZ LIQUIDE-SOLIDE PDF Download

Author: MARIANO.. DEL POZO
Publisher:
ISBN:
Category :
Languages : fr
Pages :

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ON ETUDIE LES TRANSFERTS DE MATIERE ET DE CHALEUR LIQUIDE-SOLIDE AINSI QUE LE TRANSFERT DE MATIERE GAZ-LIQUIDE DANS DES REACTEURS A LIT FLUIDISE GAZ-LIQUIDE-SOLIDE DE BILLES DE VERRE DE 3 ET 5 MM. L'ETUDE DU TRANSFERT LOCAL DE MATIERE LIQUIDE-SOLIDE UTILISE LA REDUCTION ELECTROCHIMIQUE DE L'OXYGENE DISSOUS; ELLE MET EN EVIDENCE L'INFLUENCE DU NOMBRE DE POINTS DE CONTACT ENTRE BILLES ET LE ROLE DE CHAQUE PHASE DANS LE TRANSFERT. L'ETUDE DU TRANSFERT PARTICULE-LIT FAIT APPEL A UNE TECHNIQUE ORIGINALE ET MET EN EVIDENCE LES LIMITES DES ANALOGIES CLASSIQUES ENTRE LES TRANSFERTS DE MATIERE ET DE CHALEUR. LES RESULTATS DE CES ETUDES SONT INTERPRETES A L'AIDE D'UN MODELE FILM-PENETRATION A RENOUVELLEMENT D'INTERFACE. ON PROPOSE UNE TECHNIQUE D'ETUDE DE LA FREQUENCE DES COLLISIONS ENTRE PARTICULES. CETTE TECHNIQUE MET EN EVIDENCE LA DIFFERENCE DE COMPORTEMENT ENTRE UNE ELECTRODE FIXE ET UNE ELECTRODE MOBILE. LE COEFFICIENT VOLUMETRIQUE D'ABSORPTION EST MESURE A L'AIDE D'UNE VARIANTE DE LA TECHNIQUE CLASSIQUE DE DESORPTION DANS L'AZOTE. L'ENSEMBLE DES RESULTATS OBTENUS MET EN LUMIERE L'INFLUENCE CONSIDERABLE QUE PEUT AVOIR UN ANGLE D'INCLINAISON, MEME MINIME, DE LA COLONNE PAR RAPPORT A LA VERTICALE SUR LES CARACTERISTIQUES HYDRODYNAMIQUES ET DE TRANSFERT

Author: Hai Huang
Publisher:
ISBN:
Category :
Languages : fr
Pages : 244

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1)UNE NOUVELLE METHODE DE DETERMINATION DES PARAMETRES CARACTERISTIQUES D'UN CONTACTEUR A DEUX PHASES FLUIDES MOBILES, BASEE SUR LE SUIVI D'UN TRACEUR TRANSFERABLE, PAR TRANSFORMATION DE FOURIER DES EQUATIONS PISTON-DISPERSION DES DEUX PHASES, ET IDENTIFICATION DANS LE DOMAINE FREQUENTIEL EST ETUDIEE DU POINT DE VUE NUMERIQUE. LES RESULTATS DE SIMULATIONS OU DES "ERREURS EXPERIMENTALES" SONT INTRODUITES PRECISENT LES PRECAUTIONS OPERATOIRES A OBSERVER DANS L'EXPERIENCE FUTURE. 2)LE TRANSFERT GAZ-LIQUIDE EN FLUIDISATION GAZ-LIQUIDE-SOLIDE EST ETUDIE EXPERIMENTALEMENT PAR ENREGISTREMENT DES PROFILS DE CONCENTRATION ET PAR TRACAGE ELECTROLYTIQUE DE LA PHASE CONTINUE LIQUIDE. PAR IDENTIFICATION, ON DEDUIT LES PARAMETRES COMPLETS DU MODELE PISTON DISPERSION: DEGRES DE VIDE, DISPERSION AXIALE DU LIQUIDE, COEFFICIENT DE TRANSFERT VOLUMETRIQUE K::(L)A. DANS LE CAS DE PARTICULES DENSES, LE COEFFICIENT K::(L)A DIMINUE A L'ENTREE DE LA COLONNE, EN RAISON PROBABLEMENT DE LA COALESCENCE. ON OBSERVE TOUJOURS UN BON ACCORD ENTRE LES DEUX DETERMINATIONS DU NOMBRE DE PECLET (TRACAGE ET PROFIL DE CONCENTRATION). 3)LE TRANSFERT LIQUIDE-SPHERE SOLIDE EST ANALYSE NUMERIQUEMENT JUSQU'A DES NOMBRES DE SCHMIDT TRES ELEVES (L SC 25600) PAR DISSOCIATION DE L'INTEGRATION DES EQUATIONS DU MOUVEMENT (ROTATIONNEL ET FONCTION DE COURANT) ET DE L'EQUATION DE TRANSFERT DE MATIERE, REALISE SUR UNE COUCHE BEAUCOUP PLUS MINCE. LA COMPARAISON AVEC LES RESULTATS DE DELMAS PRECISE LE DOMAINE DE VALIDITE DE LA SOLUTION, RE 300 SUR TOUTE LA SPHERE ET RE 2000 SUR LA PARTIE FRONTALE

Author: Martine Grandclaudon
Publisher:
ISBN:
Category :
Languages : fr
Pages : 400

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Nous nous sommes proposés d'utiliser une réaction de chimiluminescence afin d'étudier le transfert de matière dans des réacteurs gaz-liquide. Nous avons choisi trois appareils qui sont: le réacteur à film laminaire tombant cylindrique, le réacteur à jet laminaire et une colonne à bulles de type gazosiphon. La réaction de chimiluminescence est l'oxydation du luminol par l'oxygène singulet produit par action du chlore sur le peroxyde d'hydrogène en milieu basique. L’analyse de la lumière émise permet l'étude du transfert de matière. Pour le film et le jet, l'intensité de la lumière est proportionnelle au coefficient de transfert de matière cote liquide; dans la colonne à bulles, le transfert est limité par la consommation du luminol. La chimiluminescence a aussi été utilisée pour étudier le mélange dans un réacteur à jets liquides

Author: Saïd Mohammed Abdel-Magid Hassanien (auteur d'une thèse de sciences.)
Publisher:
ISBN:
Category :
Languages : fr
Pages :

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Author: Linda Strande
Publisher: IWA Publishing
ISBN: 1780404735
Category : Technology & Engineering
Languages : en
Pages : 428

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It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.

Author: Stuart Hill
Publisher: Birkhäuser
ISBN: 3034863101
Category : Science
Languages : en
Pages : 364

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Author: H. R. Sasse
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 792

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Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.

Author: Deryle Lonsdale
Publisher: Routledge
ISBN: 1135973504
Category : Foreign Language Study
Languages : en
Pages : 974

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A Frequency Dictionary of French is an invaluable tool for all learners of French, providing a list of the 5000 most frequently used words in the language. Based on a 23-million-word corpus of French which includes written and spoken material both from France and overseas, this dictionary provides the user with detailed information for each of the 5000 entries, including English equivalents, a sample sentence, its English translation, usage statistics, and an indication of register variation. Users can access the top 5000 words either through the main frequency listing or through an alphabetical index. Throughout the frequency listing there are thematically-organized lists of the top words from a variety of key topics such as sports, weather, clothing, and family terms. An engaging and highly useful resource, the Frequency Dictionary of French will enable students of all levels to get the most out of their study of French vocabulary. Former CD content is now available to access at www.routledge.com/9780415775311 as support material. Designed for use by corpus and computational linguists it provides the full text in a format that researchers can process and turn into suitable lists for their own research work. Deryle Lonsdale is Associate Professor in the Linguistics and English Language Department at Brigham Young University (Provo, Utah). Yvon Le Bras is Associate Professor of French and Department Chair of the French and Italian Department at Brigham Young University (Provo, Utah).

Author: Yu S. Matros
Publisher: VSP
ISBN: 9789067641272
Category : Science
Languages : en
Pages : 728

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In the last decades the investigation methods of unsteady state catalytic processes have been widely developed by the response-technique methods. From this research emerged the realization that under unsteady state conditions and, especially under artificially created ones, it is possible to increase the productivity or selectivity of a catalyst or a catalytical process as a whole. The scientific literature in this field is mostly theoretical and aims at structuring and analysing mathematical models of unsteady state catalytical processes. In this book the theoretical and applied aspects of an efficiency of artificially created unsteady conditions in catalysis are discussed. It contains the lectures from researchers from all over the world that were held during the International Conference ''Unsteady State Processes in Catalysis'', 5--8 June 1990, Novosibirsk (USSR). Topics include: -- The problems of dynamics of a catalyst surface -- Kinetic models of unsteady processes -- Dynamics of chemical reactors -- Artificially created unsteady processes in a catalytic reactor.

Author: Roy MacLeod
Publisher: Springer Science & Business Media
ISBN: 1402054904
Category : Science
Languages : en
Pages : 292

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This book represents a first considered attempt to study the factors that conditioned industrial chemistry for war in 1914-18. Taking a comparative perspective, it reflects on the experience of France, Germany, Austria, Russia, Britain, Italy and Russia, and points to significant similarities and differences. It looks at changing patterns in the organisation of industry, and at the emerging symbiosis between science, industry and the military.