Download or read book Transfert de mati re gaz liquide en milieux complexes written by Marupatch Jamnongwong and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'opération de transfert de matière gaz/liquide est une étape essentielle en génie desprocédés. Elle conditionne directement les performances des contacteurs gaz/liquide en représentantbien souvent l'étape limitant l'efficacité du procédé. L'objectif de cette étude est de proposer denouvelles investigations afin d'étudier l'effet de la présence dans l'eau pure, de certains composésgénéralement rencontrés dans les procédés biologiques, sur les coefficients de diffusion de l'oxygèneet de quantifier leurs conséquences sur les coefficients de transfert de matière côté liquide. Lescoefficients de diffusion de l'oxygène DO2 ont été mesurés dans diverses phases liquides contenant dusel (NaCl), du sucre (glucose) ou des tensio-actifs (laurylsulfate de sodium). Comparé à l'eau pure,des réductions de coefficient de diffusion DO2 ont été observées, la variation de DO2 avec laconcentration C de composé a été modélisée, elle dépend de la nature du composé ajouté. Ensuite,des expériences réalisées sur un train de bulles et sur les mêmes phases liquides ont permis ladétermination des coefficients de transfert de matière côté liquide kL. Quelle que soit la solutionaqueuse étudiée, une diminution des valeurs de kL est observée avec l'augmentation de C. Cesrésultats mettent en évidence que, même si les propriétés de l'eau pure (densité, viscosité, tensionsuperficielle) ne sont pas significativement modifiées par l'ajout de sels (NaCl), les coefficients detransfert de matière côté liquide kL peuvent être modifiés. Pour les solutions aqueuses de glucose, laréduction de kL avec DO2 est bien corrélée, et principalement due à la variation de viscosité avec laconcentration. Pour les solutions de tensio-actif, les nombres de Reynolds restent presque constantspour toutes les concentrations. Le seul responsable de la réduction du coefficient de transfert dematière côté liquide kL est donc le coefficient de diffusion de l'oxygène qui diminue avec laconcentration. La présente étude a clairement confirmé la nécessité de compléter et/ou rendre comptedes données liées aux coefficients de diffusion de l'oxygène DO2 et aux coefficients de transfert dematière côté liquide kL dans des milieux complexes (solution électrolytique, solution organique ettensioactif). Ces informations sont nécessaires pour décrire et modéliser correctement lesphénomènes de transfert de matière gaz/liquide.

Download or read book Deux tudes de transfert de mati re written by Hai Huang and published by . This book was released on 1985 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book CJChE written by and published by . This book was released on 1999-08 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling in Aquatic Chemistry written by OECD Nuclear Energy Agency and published by Nuclear Energy Agency. This book was released on 1997 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book XXth International Congress of Pure and Applied Chemistry written by and published by . This book was released on 1965 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biophysical and Biochemical Aspects of Fluorescence Spectroscopy written by T.G. Dewey and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorescence spectroscopy has traditionally found wide application in bio chemistry and cell biology. Since there are relatively few naturally occurring fluorescent biomolecules, fluorescence spectroscopy offers a combination of great specificity and sensitivity. Historically, these features have been ex ploited with great success utilizing both intrinsic and extrinsic probes. Re cent applications have built upon these traditional strengths and have re sulted in the development of new instrumental techniques, novel and convenient fluorescent probes, and a deeper, theoretical understanding of fundamental processes. Frequently, fluorescence techniques are tailored to attack a specific biological problem. These new methods in turn produce new physical situations and phenomena which are often of interest to the physical chemist. Thus, progress in one area stimulates renewed interest in other areas. The goal of this book is to provide detailed monographs on the use of fluorescence to investigate problems at the forefront of biochemistry and cell biology. This book is not meant to be a comprehensive survey but rather to highlight areas of recent developments. It is designed to be readable to the novice and yet provide sufficient detail for the expert to keep abreast of recent developments. The book is organized so that it proceeds from simple biochemical sys tems to more complex cell biological ones. Chapter I on fluorescence quenching of biological structures is a good introductory chapter. It intro duces a number of elementary concepts and discusses applications to pro teins and biomembranes.

Download or read book Advances in Solid State Fermentation written by S. Roussos and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 641 pages. Available in PDF, EPUB and Kindle. Book excerpt: G.HAINNAUX Departement Milieu et Activites Agricoles, Centre ORSTOM, 911 Avenue d' Agropolis, B.P. 5045, 34032 Montpellier Cedex , France. Solid state fermentation, popularly abbreviated as SSF, is currently investigated by many groups throughout the world. The study of this technique was largely neglected in the past in European and Western countries and there is now a high demand for SSF, meaning in food, environment, agricultural, phannaceutical and many other biotechnological applications. It gives me satisfaction to note that the importance of this technique was realised at my department way back in 1975 since then, our team has put concentrated efforts on developing this technique. xvii Foreword Advances in Solid State Fermentation Foreword M. PUYGRENIER Agropolis Valorisation, Avenue d' Agropolis, 34394 Montpellier Cedex 5, France. On the name of the Scientific Community, I would like to express the wish that this International Symposium on SSF should be successful. Solid State Fermentation is part of biotechnology research. It consists on seeding solid culture medium with bacteria or fungi (filamentous or higher) and on producing, in this medium (solid components and exudates) metabolites and high value products. In fact, this process is very old. In older industries such the food and agricultural, this technique has been extensively used. An example of this is the production of pork sausages and Roquefort cheese. Pharmaceutical industry could make extensive use of SSF in the production of secondary metabolites of many kinds and development in this direction is soon expected.

Download or read book An Introduction to Fluid Mechanics and Transport Phenomena written by G. Hauke and published by Springer Science & Business Media. This book was released on 2008-08-26 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the foundations of fluid mechanics and transport phenomena in a concise way. It is suitable as an introduction to the subject as it contains many examples, proposed problems and a chapter for self-evaluation.

Download or read book Bubbly Flows written by Martin Sommerfeld and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book summarises the outcom of a priority research programme: 'Analysis, Modelling and Computation of Multiphase Flows'. The results of 24 individual research projects are presented. The main objective of the research programme was to provide a better understanding of the physical basis for multiphase gas-liquid flows as they are found in numerous chemical and biochemical reactors. The research comprises steady and unsteady multiphase flows in three frequently found reactor configurations, namely bubble columns without interiors, airlift loop reactors, and aerated stirred vessels. For this purpose new and improved measurement techniques were developed. From the resulting knowledge and data, new and refined models for describing the underlying physical processes were developed, which were used for the establishment and improvement of analytic as well as numerical methods for predicting multiphase reactors. Thereby, the development, lay-out and scale-up of such processes should be possible on a more reliable basis.

Download or read book Journal de physique written by and published by . This book was released on 1999 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Principles and Practice of Variable Pressure Environmental Scanning Electron Microscopy VP ESEM written by Debbie Stokes and published by John Wiley & Sons. This book was released on 2008-12-22 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers a simple starting point to VPSEM, especially for new users, technicians and students containing clear, concise explanations Crucially, the principles and applications outlined in this book are completely generic: i.e. applicable to all types of VPSEM, irrespective of manufacturer. Information presented will enable reader to turn principles into practice Published in association with the Royal Microscopical Society (RMS) -www.rms.org.uk

Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.

Download or read book Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.

Download or read book A Textbook of Translation written by Peter Newmark and published by . This book was released on 1987 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas cooled Nuclear Reactors written by France. Commissariat à l'énergie atomique and published by . This book was released on 2006 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aspects th oriques et industriels de la lyophilisation written by Louis Rey and published by . This book was released on 1964 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: