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Deplacement Et Instabilites De Fluides Miscibles Et Immiscibles En Cellule De Hele Shaw
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Book Synopsis DEPLACEMENT ET INSTABILITES DE FLUIDES MISCIBLES ET IMMISCIBLES EN CELLULE DE HELE-SHAW by : ERIC.. LAJEUNESSE
Download or read book DEPLACEMENT ET INSTABILITES DE FLUIDES MISCIBLES ET IMMISCIBLES EN CELLULE DE HELE-SHAW written by ERIC.. LAJEUNESSE and published by . This book was released on 1999 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE PRESENTE UNE ETUDE EXPERIMENTALE DU DEPLACEMENT DE FLUIDES EN CELLULE DE HELE-SHAW (DEUX PLAQUES SEPAREES PAR UNE FAIBLE EPAISSEUR). DANS LA PREMIERE PARTIE, NOUS ETUDIONS LA DESTABILISATION DU DOIGT DE SAFFMAN-TAYLOR EN SECTEUR ANGULAIRE OBSERVE POUR DES FLUIDES NON MISCIBLES. NOUS MONTRONS QUE LA FORME DE LA LIGNE CENTRALE (FJORD) QUI DIVISE LE DOIGT EN DEUX BRANCHES SECONDAIRES EST SEMBLABLE A LA TRAJECTOIRE D'UNE PARTICULE ADVECTEE SUR L'INTERFACE D'UN DOIGT QUI RESTERAIT STABLE. CES FJORDS SE COMPORTENT COMME DES MURS VIRTUELS ENTRE LESQUELS DE NOUVELLES BRANCHES SECONDAIRES SE DEVELOPPENT DE SORTE QUE LE MOTIF SE COMPLEXIFIE RAPIDEMENT. NOUS AVONS CALCULE LA FONCTION DE DISTRIBUTION DE LA TAILLE DES BRANCHES SECONDAIRES. LES RESULTATS, EN ACCORD AVEC LES OBSERVATIONS EXPERIMENTALES, MONTRENT QUE, EN CANAL LINEAIRE, LA PROBABILITE D'OBSERVER UNE BRANCHE DE TAILLE SUPERIEURE A LA LARGEUR DU CANAL EST NEGLIGEABLE. DANS LES SECTEURS DE TRES GRANDS ANGLES, ON OBSERVE LA FORMATION DE FJORDS INFINIS SEPARANT DES STRUCTURES DE GRANDE TAILLE. LA SECONDE PARTIE DE CE MEMOIRE EST CONSACREE A L'ETUDE DU DEPLACEMENT DE FLUIDES MISCIBLES EN CELLULE RECTANGULAIRE VERTICALE DANS LA LIMITE DES GRANDS NOMBRES DE PECLET (DIFFUSION NEGLIGEABLE) ET EN GRAVITE STABILISANTE. IL SE FORME ALORS UNE MINCE LANGUE DE FLUIDE INJECTE ENTRE LES PLAQUES DE LA CELLULE. L'AVANCEE ET L'EPAISSEUR DE CETTE LANGUE SONT MESUREES PAR ABSORPTION DE LA LUMIERE. NOUS PRESENTONS UN MODELE, CONFIRME PAR LES EXPERIENCES, QUI PREVOIT L'EXISTENCE DE TROIS DOMAINES DIFFERENTS EN FONCTION DES VALEURS DES PARAMETRES DE CONTROLE. LE PREMIER CORRESPOND A UNE INTERFACE DONT LA FORME EST CELLE D'UNE LANGUE AUTOSIMILAIRE. LE SECOND DOMAINE EST MARQUE PAR LA PRESENCE D'UNE POINTE DE FAIBLE DIAMETRE. LE TROISIEME DOMAINE CORRESPOND A LA FORMATION D'UN MOTIF DE DIGITATION A TROIS DIMENSIONS, DE LONGUEUR D'ONDE EGALE A CINQ FOIS L'EPAISSEUR DE LA CELLULE.
Book Synopsis Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw by : Hung Truong Trieu
Download or read book Études théorique et expérimentale du transport de fluides miscibles en cellule Hele-Shaw written by Hung Truong Trieu and published by . This book was released on 2011 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, nous avons étudié expérimentalement, numériquement et théoriquement la sédimentation d'un soluté en cellule de Hele-Shaw, modèle analogue de milieu poreux, avec un écoulement zonal horizontal. Une cellule, alimentée par deux grands réservoirs assurant un écoulement zonal uniforme, a été réalisée au laboratoire. La vitesse a été mesurée par PIV. L'injection d'une solution saline dans cet écoulement permet de visualiser la propagation du panache de pollution, et de mesurer le champ de concentration par LIF. Trois configurations typiques ont été observées : panache sans digitation (« stable »), avec une seule digitation (« faiblement instable »), et avec de nombreuses digitations (« fortement instable »). L'influence du contraste de densité, de la vitesse zonale, et du débit d'injection sur la stabilité du panache a été analysée. Ces résultats ont été comparés à des simulations numériques sous COMSOL Multiphysics®. Les champs de concentration simulés sont en accord quantitatif avec les champs expérimentaux. Ces simulations ont de plus permis d'étudier l'influence de l'anisotropie du tenseur de dispersion sur la stabilité du panache. Une étude théorique linéaire, effectuée à partir d'un écoulement de base unidirectionnel et quasi-stationnaire, est venue compléter ces résultats. Elle montre que le panache est toujours convectivement instable pour les valeurs des paramètres considérées, et permet de retrouver et de quantifier les principaux résultats mis en évidence lors des études expérimentale et numérique, comme l'effet stabilisant de la dispersivité longitudinale ou l'effet déstabilisant du contraste de densité
Book Synopsis Sciences de la matière et microgravité by : Dominique Langevin
Download or read book Sciences de la matière et microgravité written by Dominique Langevin and published by . This book was released on 2001 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CJChE written by and published by . This book was released on 2001-08 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis River, Coastal and Estuarine Morphodynamics by : G. Seminara
Download or read book River, Coastal and Estuarine Morphodynamics written by G. Seminara and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluvial Remote Sensing for Science and Management by : Patrice Carbonneau
Download or read book Fluvial Remote Sensing for Science and Management written by Patrice Carbonneau and published by John Wiley & Sons. This book was released on 2012-08-15 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a comprehensive overview of progress in the general area of fluvial remote sensing with a specific focus on its potential contribution to river management. The book highlights a range of challenging issues by considering a range of spatial and temporal scales with perspectives from a variety of disciplines. The book starts with an overview of the technical progress leading to new management applications for a range of field contexts and spatial scales. Topics include colour imagery, multi-spectral and hyper-spectral imagery, video, photogrammetry and LiDAR. The book then discusses management applications such as targeted, network scale, planning, land-use change modelling at catchment scales, characterisation of channel reaches (riparian vegetation, geomorphic features) in both spatial and temporal dimensions, fish habitat assessment, flow measurement, monitoring river restoration and maintenance and, the appraisal of human perceptions of riverscapes. Key Features: • A specific focus on management applications in a period of increasing demands on managers to characterize river features and their evolution at different spatial scales • An integration across all scales of imagery with a clear discussion of both ground based and airborne images • Includes a wide-range of environmental problems • Coverage of cutting-edge technology • Contributions from leading researchers in the field
Book Synopsis Powders and Grains 2009 by : Masami Nakagawa
Download or read book Powders and Grains 2009 written by Masami Nakagawa and published by American Institute of Physics. This book was released on 2009-06-26 with total page 1156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Powders and Grains is an international scientific conference held every 4 years that brings together engineers and physicists interested in the microcmechanics of granular media, powders and grains. The meetings are organized by AEMMG (Association pour L'Etude de la Micromecanique des Milieux Granulaires). Previous meetings were held in Clement-Ferrand, France (1989), Birmingham, England (1993), Durham, USA (1997), Sendai, Japan (2001), and in Stuttgart, Germany (2005). Powders & Grains distinguishes itself from other meetings on granular materials in two ways: (1) It brings together both engineers and physicists. (2) It emphasizes the micromechanics of granular materials. The conference program includes contributions from experts around the world related to the general topic of granular media.
Book Synopsis Philostratus by : Philostratus (the Athenian)
Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analecta: Or, Materials For a History of Remarkable Providences; Mostly Relating to Scotch Ministers and Christians by : Robert Wodrow
Download or read book Analecta: Or, Materials For a History of Remarkable Providences; Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.
Book Synopsis Physical Properties of Amorphous Materials by : David Adler
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
