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Etude Du Transport Reactif De Particules En Silice En Suspension En Milieux Poreux Sature
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Book Synopsis Etude Du Transport Réactif de Particules en Silice en Suspension en Milieux Poreux Saturé by : Zyed Mesticou
Download or read book Etude Du Transport Réactif de Particules en Silice en Suspension en Milieux Poreux Saturé written by Zyed Mesticou and published by . This book was released on 2014 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suspended particles transport through a saturated porous medium is an important research topic in several sectors related to the environment or industrial problems. The purpose of this thesis is to characterize deposition and release mechanisms in the case of the transport of silt micro particles (silica) flow through saturated sand. The influence of ionic strengh and the flow velocity are studied. The approach is first expérimental. In this context, laboratory column experiments are performed. The results show clearly the presence of both physicochemical and mechanical retention mechanisms. It is show that the suspension ionic strength increase results in increaded deposition rate. This is consistent with the DLVO theory. In addition, the deposit is marked by a gradual saturation of physicochemical and mechanical retention sites. The esperiments show also that the release phenomenon arises not only from the variation of the hydraulic speed but also from the ionic strength value and expecially of this variation. In this framework, experiments show clearly the presence of a clogging front. The latter moves in the flow direction with a rate proportional to the ionic strength and the flow velocity. The study shows that the clogging increases with the ionic strength. It is more pronounced at low speeds. In a second approach, a multiphasic model is developed to simulate the suspension particle transport under the influence of the ionic strength and the flow velocity. The two effects are coupled. Thus, the deposition and release kinetics are proposed to model these two phenomena. These kinetics are expressed as a function of the suspension flow rate and salinity in accordance with experimental results. The proposed model is validated with experimental tests. It reproducesin a realistic way the transport dynamics of the micro particles in suspension under the influence of ionic strength and flow velocity variations.
Book Synopsis Transport et dépôt de particules en suspension dans un milieu poreux saturé by : Ahmed Hammadi
Download or read book Transport et dépôt de particules en suspension dans un milieu poreux saturé written by Ahmed Hammadi and published by . This book was released on 2016 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une étude expérimentale sur le transfert des particules en suspension dans les milieux poreux est menée au laboratoire sur des colonnes remplies de sable en utilisant des techniques de traçage. Les effets du milieu poreux, de la taille des particules et de la polydispersivité de ces particules sur leur transport et dépôt sont étudiés. Des injections impulsion et des injections en continue de particules en suspension monodisperses (Latex) et polydisperses (Kaolinite) à différentes vitesses d’écoulement ont été réalisées. Deux milieux poreux de granulométries serrées et un troisième milieu poreux constitué du mélange des deux précédents sont utilisés. Par ailleurs, pour étudier l’effet de la taille et de de la polydispersivité des particules injectées, trois populations monodisperses de particules de latex ainsi que trois mélanges de ces dernières ont été utilisés. Les paramètres caractérisant le transport et le dépôt des particules en suspension sont déterminés en utilisant la solution analytique de l’équation convection-dispersion avec une cinétique de dépôt de premier ordre. L’effet de sélection de taille est étudié à partir des analyses granulométriques des particules prélevées dans les effluents à différents moments de la restitution et des particules déposées à différents horizons dans le milieu poreux. Les résultats ont montré que la vitesse d’écoulement, la distribution granulométrique du milieu poreux, la taille et la polydispersivité des particules en suspension jouent un rôle important dans le transport et le dépôt dans les milieux poreux.
Book Synopsis Étude des mécanismes de transport et la cinétique de dépôt des particules en suspension dans un milieu poreux saturé by : Nasre-dine Ahfir
Download or read book Étude des mécanismes de transport et la cinétique de dépôt des particules en suspension dans un milieu poreux saturé written by Nasre-dine Ahfir and published by . This book was released on 2006 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux de recherche abordés dans cette thèse concernent l'étude expérimentale du transport et dépôt des particules en suspension dans un milieu poreux saturé. Les particules en suspension sont impliquées dans de nombreuses problématiques liées aux ouvrages hydrauliques en terre, à l'exploitation des ressources naturelles des sous-sols telles que l'alimentation en eau potable et la production pétrolière. En raison de leur célérité de transport dans les eaux, les particules en suspension peuvent être des vecteurs de pollution ou des freins par leur dépôt. Deux types de particules en suspension ont été sélectionnés pour cette étude : des particules naturelles (limon) et des particules synthétiques (polyamide) caractérisées par une densité proche de celle de l'eau. Des injections brèves du mélange particules en suspension et traceur dissous conservatif (fluorescéine) ont été réalisées sur des colonnes de laboratoire, de longueurs variables, remplies de gravier ou de billes de verre. L'interprétation des résultats de traçages en utilisant l'équation de convection-dispersion avec une cinétique de dépôt de premier ordre (site irréversible), nous a permis de déterminer les différents paramètres hydrodispersifs. La vitesse d'écoulement, la structure interne, la longueur du milieu poreux (effet d'échelle), la taille et la densité des particules en suspension sont les paramètres qui influent sur le transport et dépôt des particules. L'effet d'exclusion de taille où le transport rapide des particules en suspension par rapport au traceur conservatif est mis en évidence. La dispersion des traceurs augmente avec la vitesse moyenne de pore et est décrite par une relation non linéaire. La dispersivité augmente avec la longueur de la colonne. Le taux de restitution des particules en suspension dépend de la nature du milieu poreux, de la vitesse découlement, de la taille et de la densité des particules en suspension. Le coefficient cinétique de dépôt varie avec la vitesse d'écoulement. Il augmente jusqu'à une certaine valeur critique de la vitesse puis diminue. Cette vitesse critique dépend de la longueur du milieu poreux et de la densité des particules en suspension. Les effets géométriques et hydrodynamiques influencent le comportement de transport et dépôt des particules en suspension.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Diffusion in Materials - DIMAT 2011 by : Igor Bezverkhyy
Download or read book Diffusion in Materials - DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
Download or read book Gas Geochemistry written by Claude Dubois and published by . This book was released on 1995 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Physics by : Nelson Bolívar
Download or read book Environmental Physics written by Nelson Bolívar and published by Arcler Press. This book was released on 2018-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth is undergoing constant changes from the beginning of its formation. After the formation of the planet around 4.54 billion years ago, it has been changing ever since. In the beginning, it was in a liquid gas form which eventually cooled down and the surface took a hard-solid form during the time period of nearly 2 billion years after the creation of the earth. First life on the surface of earth was created about 3.8 billion years ago. And only less than 5 million years ago Homo sapiens developed. Within this really short period of time of existence compared to the age of the earth, mankind has been developing fast. And the main fuel of this development has been science and the technological advancements derived from the knowledge of science. The development of science started the moment humans created fire for the first time and now the knowledge of science has become so vast and widespread that it is literally impossible for an individual to even go through the complete knowledge acquired by humans. In the knowledge and the scientific practices, the environment plays an important role. As we are surrounded by the materials of the environment, they affect every single effort of science to understand the unknown and to develop new ways of development. In every aspect of science, the environment plays an important role which cannot be neglected or overlooked. To address the effect of the atmosphere and environment around us in our everyday life as well as in the development of science, the scientists have been feeling the necessity to modify the acquired knowledge to acknowledge and understand the effects of environment on the facts explore. And this is where environmental physics comes in. Environmental physics is a part of physics which discuss and describes the effect of environment on many scientific effects and vice versa. In order to understand and face the rapid changes in the atmosphere and to make proper utilization of the discoveries conducted by science, it is important to understand the physical effects of different simulations on the environment and also to develop the ways of controlling them. This book was developed to make the readers easily understand the close interrelation of physics with biology, chemistry, and environmental science as well as providing knowledge about the interrelations within different natural forces and their effects on each other as well as on the environment. If this book is able to help the reads in understanding the deep relationship within different Book jacket.
Book Synopsis Forest Fire Research by : Universidade de Coimbra
Download or read book Forest Fire Research written by Universidade de Coimbra and published by . This book was released on 2010 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atmosphere and Climate by : Ulrich Foelsche
Download or read book Atmosphere and Climate written by Ulrich Foelsche and published by Springer Science & Business Media. This book was released on 2006-08-11 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents carefully edited and peer-reviewed papers from the 2nd International Workshop on Occultations for Probing Atmosphere and Climate (OPAC-2), held in Graz, Austria. It starts with a general introductory paper and proceeds to address the full range from methodology in general via specific occultation methods (GNSS-LEO, LEO-LEO, stellar and solar) to the use of occultation data, with focus on atmospheric physics, meteorology and climate.
