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Effet Des Films Liquides En Evaporation
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Book Synopsis Effet des films liquides en évaporation by : Fabien Chauvet
Download or read book Effet des films liquides en évaporation written by Fabien Chauvet and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail est axé sur l'étude de l'évaporation lente d'un liquide confiné dans un tube capillaire de section carrée, en lien avec l'étude du phénomène de séchage. Dans un tel capillaire, si le liquide est suffisamment mouillant, des films liquides se forment par capillarité le long des coins internes. L'évaporation du liquide en sommet de film engendre un pompage capillaire et l'espèce volatile est alors transportée, sous phase liquide, au plus près du sommet du capillaire. Ce mode de transport dépend de la compétition entre les effets capillaires et les effets visqueux et de gravité qui s'opposent tous deux au mouvement du liquide vers le sommet du capillaire. Ces films liquides sont étudiés en adoptant une approche expérimentale. Le principe des expériences est de laisser un liquide volatil s'évaporer dans un tube capillaire carré. Plusieurs expériences d'évaporation sont réalisées en faisant varier la nature du liquide, la taille du capillaire et son orientation (horizontale et verticale). Une méthode de thermographie infra-rouge permet de mesurer le profil de température le long du capillaire. Le refroidissement induit par le changement de phase liquide-vapeur ainsi que sa position sont alors mesurables. A partir d'une méthode de visualisation par ombroscopie, plusieurs grandeurs sont mesurées : position du ménisque principal, taux d'évaporation et épaisseur relative des films. En s'appuyant sur une analyse simple du transfert de masse, on montre alors que les cinétiques d'évaporation obtenues expérimentalement se divisent en trois principales phases caractéristiques, ressemblant fortement aux trois périodes de la cinétique classique de séchage des milieux poreux capillaires. L'analyse de l'hydrodynamique des films montre qu'il est indispensable de prendre en compte l'arrondi interne des coins des capillaires dans la modélisation de l'écoulement au sein des films. On montre notamment que le phénomène étudié est très sensible à ce paramètre, qui limite l'extension des films. Ce travail expérimental a permis de développer une modélisation du transfert de masse dans la configuration étudiée, couplée à une modélisation de l'écoulement des films, et finalement de proposer un modèle de séchage d'un capillaire carré quantitativement satisfaisant.
Book Synopsis Effect of Adsorbed Monomolecular Films on the Evaporation of Volatile Organic Liquids by : Marianne K. Nernett
Download or read book Effect of Adsorbed Monomolecular Films on the Evaporation of Volatile Organic Liquids written by Marianne K. Nernett and published by . This book was released on 1969 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was made of the effect of adsorbed surface-active films on the rate of evaporation of volatile organic liquids. A series of partially fluorinated compounds were studied either as monolayers adsorbed from solution or as insoluble films spread at the liquid/vapor interface. In no instance was the rate of evaporation significantly reduced by the presence of a monomolecular film. Insoluble multimolecular films of polydimethylsiloxanes, however, were found to reduce effectively the rate of evaporation, provided the film thickness was sufficient to decrease the rate of diffusion of the solvent molecules through the film to a value below their rate of diffusion through the saturated, nonturbulent vapor layer overlying the surface. In addition to polydimethylsiloxane polymolecular layers, thin layers of water, containing suitable fluorocarbon spreading agents, were also found to reduce the rate of evaporation of certain volatile organic liquids. These aqueous films are similar to the thin layers of interlamellar water present in aqueous foams used to extinguish gasoline fires, such as the fluorocarbon-containing Light Water foams. (Author).
Book Synopsis Evaporation from Thin Liquid Films by : Kang Ryul Chun
Download or read book Evaporation from Thin Liquid Films written by Kang Ryul Chun and published by . This book was released on 1969 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaporation and Heating of Laminar and Turbulent Falling Liquid Films by : Amir Faghri
Download or read book Evaporation and Heating of Laminar and Turbulent Falling Liquid Films written by Amir Faghri and published by . This book was released on 1976 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Sensible Heating and Evaporation in Free-falling Liquid Films by : Jeffrey Alan Shmerler
Download or read book A Study of Sensible Heating and Evaporation in Free-falling Liquid Films written by Jeffrey Alan Shmerler and published by . This book was released on 1986 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Surface Films on Evaporation by : Thomas G. Drummond
Download or read book The Effect of Surface Films on Evaporation written by Thomas G. Drummond and published by . This book was released on 1964 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Evaporation and Surface Tension on the Shape of the Profile of a Liquid Film Draining on a Vertical Clean Wetted Glass Plate by : Herbert Givens
Download or read book The Effect of Evaporation and Surface Tension on the Shape of the Profile of a Liquid Film Draining on a Vertical Clean Wetted Glass Plate written by Herbert Givens and published by . This book was released on 1933 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stability and Evaporation of Thin Liquid Films in Two Phase Flow by :
Download or read book Stability and Evaporation of Thin Liquid Films in Two Phase Flow written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Wind on Evaporation Suppressing Films and Methods of Modification by : Franklin R. Crow
Download or read book The Effect of Wind on Evaporation Suppressing Films and Methods of Modification written by Franklin R. Crow and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Etude de l'évaporation d'un film liquide pur et de solutions aqueuses ruisselant sur un cylindre horizontal by : Lahcen El Omari
Download or read book Etude de l'évaporation d'un film liquide pur et de solutions aqueuses ruisselant sur un cylindre horizontal written by Lahcen El Omari and published by . This book was released on 2003 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce mémoire présente une étude numérique et expérimentale de l'évaporation d'un film liquide. Les études expérimentales ont été menées pour le cas où l'alimentation est effectuée par un dispositif de distribution d'eau en nappe, colonnes ou en gouttes. Cette dernière est effectuée dans le cas d'un film d'eau ruisselant sur un cylindre lisse horizontal afin de déterminer le nombre de Nusselt moyen et d'estimer le coefficient d'échange thermique local. L'utilisation du problème inverse de conduction de la chaleur (PICC) a permis de déterminer les conditions aux limites difficiles à mesurer telles que : la température de la surface et la densité de flux thermique sur tout le pourtour du cylindre. L'étude numérique est composée de deux parties : la première traite de l'évaporation d'un film liquide pure et de solutions aqueuses ruisselant autour d'un cylindre horizontal. La seconde traite de l'évaporation d'un film liquide tombant en nappe sur un cylindre horizontal.
Book Synopsis Bulletin de L'Institut International Du Froid by :
Download or read book Bulletin de L'Institut International Du Froid written by and published by . This book was released on 2007 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drying in the Dairy Industry by : Cécile Le Floch-Fouéré
Download or read book Drying in the Dairy Industry written by Cécile Le Floch-Fouéré and published by CRC Press. This book was released on 2020-11-25 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: With more than 12M tons of dairy powders produced each year at a global scale, the drying sector accounts to a large extent for the processing of milk and whey. It is generally considered that 40% of the dry matter collected overall ends up in a powder form. Moreover, nutritional dairy products presented in a dry form (eg, infant milk formulae) have grown quickly over the last decade, now accounting for a large share of the profit of the sector. Drying in the Dairy Industry: From Established Technologies to Advanced Innovations deals with the market of dairy powders issues, considering both final product and process as well as their interrelationships. It explains the different processing steps for the production of dairy powders including membrane, homogenisation, concentration and agglomeration processes. The book includes a presentation of the current technologies, the more recent development for each of them and their impact on the quality of the final powders. Lastly, one section is dedicated to recent innovations and methods directed to more sustainable processes, as well as latter developments at lab scale to go deeper in the understanding of the phenomena occurring during spray drying. Key Features: Presents state-of-the-art information on the production of a variety of different dairy powders Discusses the impact of processing parameters and drier design on the product quality such as protein denaturation and viability of probiotics Explains the impact of drying processes on the powder properties such as solubility, dispersibility, wettability, flowability, floodability, and hygroscopicity Covers the technology, modelling and control of the processing steps This book is a synthetic and complete reference work for researchers in academia and industry in order to encourage research and development and innovations in drying in the dairy industry.
Download or read book ASME 65-HT-39 written by J. R. O'Loughlin and published by . This book was released on 1965 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mass Transfer Effects in Falling Film Evaporation of Ternary Mixtures by : Qi Wang
Download or read book Mass Transfer Effects in Falling Film Evaporation of Ternary Mixtures written by Qi Wang and published by . This book was released on 1990 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat and Mass Transfer by : Alekseĭ Vasilʹevich Lykov
Download or read book Heat and Mass Transfer written by Alekseĭ Vasilʹevich Lykov and published by . This book was released on 1967 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stabilité linéaire des films liquides avec changement de phase à l'interface by : Bertrand Spindler
Download or read book Stabilité linéaire des films liquides avec changement de phase à l'interface written by Bertrand Spindler and published by . This book was released on 1980 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA STABILITE LINEAIRE DE L'ECOULEMENT D'UN FILM LIQUIDE SUR UN PLAN INCLINE AVEC FLUX DE CHALEUR A LA PAROI ET CHANGEMENT DE PHASE A L'INTERFACE. SIMPLIFICATION RATIONNELLE DES EQUATIONS BASEE SUR L'ETUDE DE L'ORDRE DE GRANDEUR DES DIFFERENTS TERMES, A PARTIR D'HYPOTHESES SIMPLES CONCERNANT LA PHYSIQUE DE L'ECOULEMENT. ETUDE DE LA STABILITE D'UN FILM PREEXISTANT ET DE CELLE DE L'ECOULEMENT D'UN FILM DE CONDENSATION. DANS LES DEUX CAS, ON SUPPOSE QU'IL N'Y A PAS DE COURANT IMPOSE DE VAPEUR, MAIS ON TIENT COMPTE DE L'EFFET D'ENTRAINEMENT DE LA VAPEUR PAR LE FILM LIQUIDE
Book Synopsis Etude expérimentale de l'évaporation flash d'un film d'eau by : Didier Saury
Download or read book Etude expérimentale de l'évaporation flash d'un film d'eau written by Didier Saury and published by . This book was released on 2003 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'évaporation flash (ou flashing) est le procédé par lequel de la vapeur est libérée d'un écoulement de liquide ou d'un réservoir contenant un liquide par variation soudaine des propriétés thermodynamiques en dessous des conditions de saturation du liquide. Ce travail présente les résultats de l'étude expérimentale de l'influence de paramètres tels que la surchauffe, le niveau initial de liquide ou encore du taux de dépressurisation sur la cinétique du phénomène d'évaporation flash d'un film d'eau. Au terme de cette étude, des corrélations adimensionnelles reliant le débit maximal évaporé, le temps de flashing (t*) et la masse évaporée à l'instant t* à la température initiale, au taux de dépressurisation, au niveau d'eau initial, et à la surchauffe du liquide ont pu être proposées. Ces dernières mettent aussi en évidence l'évolution de la cinétique du phénomène avec les paramètres cités précédemment et fournissent quelques critères d'optimisation.
