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Dissertations / Theses on the topic 'Transport in fractured porous media'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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1

Kang, Peter Kyungchul. "Anomalous transport through porous and fractured media." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90043.

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Thesis: Ph. D. in Hydrology, Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 132-144).<br>Anomalous transport, understood as the nonlinear scaling with time of the mean square displacement of transported particles, is observed in many physical processes, including contaminant transport through porous and fractured geologic media, animal and human foraging patterns, tracer diffusion in biological systems, and transport in complex networks. Understanding the orig
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2

Deng, Hailin. "Upscaling reactive transport parameters for porous and fractured porous media." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-10292009-103844/.

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Thesis (Ph. D.)--Florida State University, 2009.<br>Advisor: Ming Ye, Zhenxue Dai, Florida State University, College of Arts and Sciences, Dept. of Geological Sciences. Title and description from dissertation home page (viewed on Apr. 26, 2010). Document formatted into pages; contains xxii, 167 pages. Includes bibliographical references.
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3

ALVARENGA, JULIO ERNESTO MACIAS. "NUMERICAL MODELING OF VIRUS TRANSPORT IN FRACTURED-POROUS MEDIA." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=11744@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>GRUPO DE TECNOLOGIA DE COMPUTAÇÃO GRÁFICA - PUC-RIO<br>A avaliação do potencial de contaminação de capatações de água, por causa das águas residuais provenientes dos sistemas de tanque séptico, é feita a partir da definição da distância de separação mínima que deve existir entre a captação e o local de infiltração do efluente. A determinação dessa distância define a zona de proteção da captação. Existem três metodologias para definir o tamanho dessa zona de proteção: metodologias baseadas em distâncias fixas e tempos de
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4

Botros, Farag Elia Farag. "On upscaling groundwater flow and transport parameters in porous and fractured media." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3275828.

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5

Pollard, Adam Spencer. "A numerical study of flow and contaminant transport in fractured porous media." Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284632.

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6

Graf, Thomas. "Modeling coupled thermohaline flow and reactive solute transport in discretely-fractured porous media." Thesis, Québec : Université Laval, 2005. http://www.theses.ulaval.ca/2005/23197/23197.pdf.

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7

Graf, Thomas. "Modeling coupled thermohaline flow and reactive solute transport in discretely-fractured porous media." Doctoral thesis, Université Laval, 2006. http://hdl.handle.net/20.500.11794/18230.

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Tableau d’honneur de la Faculté des études supérieures et postdoctorales, 2005-2006<br>Un modèle numérique tridimensionnel a été développé pour la simulation du système chimique quartz-eau couplé avec l’écoulement à densité et viscosité variable dans les milieux poreux discrètement fracturés. Le nouveau modèle simule aussi le transfert de chaleur dans les milieux poreux fracturés en supposant que l’expansion thermique du milieu est négligeable. Les propriétés du fluide, densité et viscosité, ainsi que les constantes chimiques (constant de taux de dissolution, constant d’équilibre, coefficient
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8

TELLES, ISABELLE DE ARAUJO. "DEVELOPMENT OF AN INTEGRATED SYSTEM FOR THE MODELLING OF FLOW AND TRANSPORT IN POROUS AND FRACTURED MEDIA." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8662@1.

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AGÊNCIA NACIONAL DE PETRÓLEO<br>Este trabalho apresenta o desenvolvimento de um sistema integrado de modelagem, tridimensional, de fluxo e transporte em meios porosos e fraturados. O sistema é composto de seis programas computacionais, que são responsáveis pela geração de superfícies geológicas (Gocad), geração de sistemas de fraturas (FracGen3D), modelagem geométrica (MG), análise numérica de fluxo e transporte (soluto e partículas) (FTPF-3D) e visualização dos resultados (Pos3D e Matlab). Dos programas, dois foram desenvolvidos neste trabalho (FracGen3D e o FTPF-3D) e quatro foram int
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9

Koohbor, Behshad. "Modeling water flow and mass transport in fractured porous media : application to seawater intrusion and unsaturated zone." Thesis, Strasbourg, 2020. http://www.theses.fr/2020STRAH013.

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Ce mémoire de thèse traite de la modélisation des écoulements et du transport dans les milieux poreux fracturés, avec deux applications : l'intrusion saline dans les aquifères côtiers et l'écoulement dans la zone non saturée fracturée. Les principaux objectifs sont d'améliorer l'efficacité et la précision des modèles numériques afin de renforcer leur capacité à traiter des situations réelles de terrain. Une partie importante est consacrée au développement de solutions semi-analytiques pour l'intrusion d'eau de mer avec le modèle d'écoulement densitaire. Ces solutions sont utiles à des fins d'a
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10

Süß, Mia. "Analysis of the influence of structures and boundaries on flow and transport processes in fractured porous media." [S.l. : s.n.], 2005. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11759360.

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11

Momeni, Sina. "Non-linear diffusion in fractured porous media and application to dual-medium inter-porosity flux." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS496.

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Les transferts en milieu poreux fracturés sont importants dans de nombreuses applications industrielles telles que la production pétrolière, l'exploitation géothermique, la dépollution des sols ou le stockage géologique. L'analyse dimensionnelle des transferts matrice-fracture doit prendre en compte tous les mécanismes physiques entraînant les transferts, la diffusivité de la pression, la gravité/ségrégation, la force capillaire, l'écoulement visqueux, la diffusion moléculaire pour les transferts de composition et l'altération chimique du fluide/de la roche. La modélisation et la mise à l'éche
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12

Langer, Vera Waltraud. "Investigation of trichloroethene (TCE) transport in fractured porous media with emphasis on sorption onto stylolites and matrix diffusion." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0011/NQ41616.pdf.

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13

Zhang, Keni. "The modal reduction method for simulation of groundwater flow and multi-species contaminant transport in fractured porous media." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0026/NQ51676.pdf.

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14

Samardzioska, T. "Boundary element dual reciprocity method with multi domains for modelling fractured porous media : single and two-phase flow and transport." Thesis, Cardiff Metropolitan University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521506.

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15

Süß, Mia [Verfasser]. "Analysis of the influence of structures and boundaries on flow and transport processes in fractured porous media / Institut für Wasserbau der Universität Stuttgart. Vorgelegt von Mia Süß." Stuttgart : Inst. für Wasserbau, 2005. http://d-nb.info/974748897/34.

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16

Kordilla, Jannes Verfasser], Martin [Akademischer Betreuer] Sauter, Alexandre [Akademischer Betreuer] Tartakovsky, and Insa [Akademischer Betreuer] [Neuweiler. "Flow and transport in saturated and unsaturated fractured porous media: Development of particle-based modeling approaches / Jannes Kordilla. Gutachter: Martin Sauter ; Alexandre Tartakovsky ; Insa Neuweiler. Betreuer: Martin Sauter." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2014. http://d-nb.info/1059570092/34.

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17

Lekmine, Gregory. "Caractérisation de la dynamique de transports dans les milieux fractures par tomographie de resistivité électrique : développements méthodologiques et expérimentaux." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112097.

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La tomographie de résistivité électrique (ERT) est une méthode courante géophysique de terrain, souvent utilisée pour détecter et l’évolution suivre les panaches de polluants en zone saturée. L’ERT est cependant une méthode intégratrice dont la fiabilité des modèles est confronte aux problèmes de non unicité des solutions du problème inverse. Ces contraintes limitent l’interprétation des modèles a un aspect qualitatif de la distribution des contrastes de résistivité modélises en 2D ou 3D, résultant du choix des paramètres d’inversion et de l’association de paramètres du milieu non identifiable
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18

Dashti, Hameeda. "Miscible displacement in fractured porous media." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq64994.pdf.

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19

PAITAN, CESAR AUGUSTO TORRES. "NUMERICAL MODELLING OF FLOW IN FRACTURED AND FRACTURED POROUS MEDIA." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23503@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Este trabalho apresenta o desenvolvimento/montagem de um sistema computacional para análise de fluxo em meios porosos, meios fraturados, porosos fraturados e em combinações destes meios, considerando regime permanente ou transiente, sob condições saturadas e não saturadas. O sistema consiste de quatro programas, três programas de funções específicas interligadas por rotinas de programação feitas na linguagem Cmaismais e o quarto é um visualiz
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20

Daher, Ibrahim. "Salt transport experiments in fractured media." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45285.

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During the sequestration of CO2 into down-hole rock formations, salt precipitation may occur due to the drying of the formation brine if the injected CO2 is dry. This can negatively affect the performance of injection wells and can even lead to well clogging, which is a serious risk for such operations. Further, the salt deposition can alter the flow of the CO2 in the formation altering the storage capacity. Therefore, it is very important to explore the effect on CCS (Carbon Capture and Storage) process of drying out and salt precipitation during CO2 injection. This study is focused on CCS in
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21

Mettier, Ralph. "Mass transport in fractured media transition to anomalous transport /." [S.l. : s.n.], 2007.

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22

Reichenberger, Volker. "Numerical simulation of multiphase flow in fractured porous media." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970266049.

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23

Hyun, Yunjung. "Multiscale anaylses of permeability in porous and fractured media." Diss., The University of Arizona, 2002. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_2002_321_sip1_w.pdf&type=application/pdf.

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24

Dyrdahl, Joachim. "Thermal flow in fractured porous media and operator splitting." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for matematiske fag, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25927.

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Thermal flow in fractured porous medium is an area of interest for both the oil and the geothermal energy industry. The mathematical model consists of multiple equations, often various conservation laws and constitutive relations. Solving these equations simultaneously is called the fully implicit approach, an alternative is sequential splitting. We investigate and compare these approaches, applied on incompressible and compressible cases of single-phase and two-phase fluid flow. The experiments show that the difference of the solutions between our approaches is small, and that the results fro
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25

Jing, Wen 1966. "Virus transport through porous media." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/291550.

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Investigated in laboratory column experiments were the effects of 0.01 M and 0.001 M CaPO₄ concentrations and pH on the attachment-detachment of bacteriophages PRD-1 and MS-2. Bacteriophages PRD-1 and MS-2 exhibited attachment to the soil at concentrations of 0.01M CaPO₄ and 0.5M NaCl. Release of attached phage at 0.001 M CaPO₄ and without NaCl was observed. The pH was also found to affect the attachment-detachment of PRD-1 and MS-2. However, they attached at pH 5.5 and detached at pH 8.0 at a limited extent and over an extented long period of time. The effect of salt concentration on deattach
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26

Kilchherr, Rudolf. "Transport phenomena in porous media." Thesis, Kingston University, 2003. http://eprints.kingston.ac.uk/20729/.

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Non-Newtonian flow in heterogeneous media is of enormous theoretical and industrial importance. This phenomenon is studied to reveal macroscopic effects that arise due to the interaction between the non-linear flow behaviour and the spatial variation of the medium through which it is forced to move. The heterogeneity is achieved by using porous granular media, which is naturally non-homogeneous. The non-Newtonian properties of the fluid may have many causes and is an intrinsic property of the fluid that is used: One way of achieving it is by studying dense slurries of neutral particles or natu
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Rhodes, Matthew Edward. "Transport in heterogeneous porous media." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/1296.

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We present a new algorithm for modelling single phase transport of a tracer in porous media which demonstrates that structure on all scales affects macroscopic transport behaviour. We marry the robustness of the continuous time random walk (CTRW) framework with the simplicity of a Monte Carlo approach to reservoir simulation. We simulate transport as a series of particles transitioning between nodes with probability (t).dt that a particle will first arrive at a nearest neighbor in a time t to t + dt. To this end we first determine the mixing rules and transition probability ADE(t) for transpor
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28

Ruthven, Douglas M. "Diffusion through porous media." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-188922.

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This paper considers permeation through microporous or nanoporous inorganic membranes under the influence of an applied pressure gradient. In general membrane permeation may be considered as a diffusive process, driven by the gradient of chemical potential (which depends on both composition and pressure). The relative importance of these two factors varies greatly for different types of system. The general features of such processes are reviewed and the diffusional behavior of selected systems is examined. (membrane permeation, osmosis, diffusion, zeolite membrane, DDR-3, SAPO-34)
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29

Ekanem, Aniekan Martin. "Analysis of P-wave attenuation anisotropy in fractured porous media." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7621.

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Fractures exert a strong influence on fluid flow in subsurface reservoirs, and hence an adequate understanding of fracture properties could provide useful information on how they may be managed optimally to produce oil and gas or to be used as repositories for carbon dioxide (CO2) to mitigate climate change. Since fractures are commonly aligned by the stress field, seismic anisotropy is a key tool in investigating their properties. Velocity anisotropy is now a well-established technique for determining properties such as fracture orientation and density, but in recent years, attention has focu
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Galvin, Robert John. "Elastic wave attenuation, dispersion and anisotropy in fractured porous media /." Full text available, 2007. http://adt.curtin.edu.au/theses/available/adt-WCU20071218.143340.

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31

Galvin, Robert. "Elastic wave attenuation, dispersion and anisotropy in fractured porous media." Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/1735.

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Development of a hydrocarbon reservoir requires information about the type of fluid that saturates the pore space, and the permeability distribution that determines how the fluid can be extracted. The presence of fractures in a reservoir can be useful for obtaining this information. The main objectives of this thesis are to investigate how fracturing can be detected remotely using exploration seismology. Fracturing will effect seismic data in a number of ways. Firstly, if the fractures are aligned preferentially in some direction, the medium will exhibit long wavelength anisotropy. In turn, if
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Galvin, Robert. "Elastic wave attenuation, dispersion and anisotropy in fractured porous media." Curtin University of Technology, Department of Exploration Geophysics, 2007. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=17486.

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Development of a hydrocarbon reservoir requires information about the type of fluid that saturates the pore space, and the permeability distribution that determines how the fluid can be extracted. The presence of fractures in a reservoir can be useful for obtaining this information. The main objectives of this thesis are to investigate how fracturing can be detected remotely using exploration seismology. Fracturing will effect seismic data in a number of ways. Firstly, if the fractures are aligned preferentially in some direction, the medium will exhibit long wavelength anisotropy. In turn, if
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33

Awan, Faisal Ur Rahman. "Electrokinetic investigation of coal fines in fractured and porous media." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2523.

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Coal seams are unconventional subsurface formations that host methane and are weaker (relative to conventional subsurface) formations. Coal seams are prone to coal fines generation within the fractured porous space throughout the life of the reservoir. These coal fines damage the permeability, deliverability and productivity of coal seams. Furthermore, the coal fines mobility/blockage in the hydraulically induced fractures and proppant packs negatively impacts the proppant conductivity. In this work, a comprehensive study has been conducted to augment the understanding of coal fines and their
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Maghami, Nick Hamidreza. "Towards large-scale modelling of fluid flow in fractured porous media." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6118.

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To date, the complexity of fractured porous media still precludes the direct incorporation of small-scale features into field-scale modelling. These features, however, can be instrumental in shaping and triggering coarsening instabilities and other forms of emergent behaviour which need to be considered on the field-scale. Here we develop numerical simulation methods for this purpose and demonstrate their improved performance in single-and two-phase flow simulations with models of fractured porous media. Material discontinuities in fractured porous media strongly influence single-and multi-pha
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Ippisch, Olaf. "Coupled transport in natural porous media." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96376022X.

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Ippisch, Olaf. "Coupled transport in natural porous media." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10605053.

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37

Watanabe, Norihiro. "Finite element method for coupled thermo-hydro-mechanical processes in discretely fractured and non-fractured porous media." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-104411.

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Numerical analysis of multi-field problems in porous and fractured media is an important subject for various geotechnical engineering tasks such as the management of geo-resources (e.g. engineering of geothermal, oil and gas reservoirs) as well as waste management. For practical usage, e.g. for geothermal, simulation tools are required which take into account both coupled thermo-hydro-mechanical (THM) processes and the uncertainty of geological data, i.e. the model parametrization. For modeling fractured rocks, equivalent porous medium or multiple continuum model approaches are often only the
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Amoah, Nelson. "Experimental and numerical study of solute transport through saturated fractured porous aquifer." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25764.pdf.

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Ghafouri, H. R. "Finite element modelling of multi-phase flow through deformable fractured porous media." Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637047.

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Based on the theory of 'Double-Porosity', three-phase fluid flow in a fractured porous media has been formulated using continuity and equilibrium equations where displacement is also a primary unknown. Unlike previous models used for fractured media, the pressure of each fluid phase within the fracture network and porous rock has been considered to be coupled with the deformation of porous media. Also coupling between the fracture network and the porous rock is carried out using 'Transfer Function' or 'Leakage Term'. The derived equations are then discretised using 'Finite Element Method' wher
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Bajaj, Reena. "An unstructured finite volume simulator for multiphase flow through fractured-porous media." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54839.

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Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2009.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 77-78).<br>Modeling of multiphase flow in fractured media plays an integral role in management and performance prediction of oil and gas reserves. Geological characterization and nmultiphase flow simulations in fractured media are challenging for several re
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41

Robertson, Mark Donald. "A statistical continuum approach for mass transport in fractured media." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29740.

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The stochastic-continuum model developed by Schwartz and Smith [1988] is a new approach to the traditional continuum methods for solute transport in fractured media. Instead of trying to determine dispersion coefficients and an effective porosity for the hydraulic system, statistics on particle motion (direction, velocity and fracture length) collected from a discretely modeled sub-domain network are used to recreate particle motion in a full-domain continuum model. The discrete sub-domain must be large enough that representative statistics can be collected, yet small enough to be modeled with
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42

Shao, Haibing. "Modelling reactive transport processes in porous media." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-61738.

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Reactive transport modelling has wide applications in geosciences. In the field of hydrogeology, it has been utilised to simulate the biogeochemical processes that disperse and degrade contaminants in the aquifer. For geotechnical applications, such as geological CO2 sequestration, the reaction of CO2 with the ambient saline aquifer determines the final success of storage. In a radioactive waste repository, scientists rely on reactive transport models to predict the mobilisation of hazardous radionuclides within space and time. In this work, the multi-component mass transport code OpenGeoSys
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Nguyen, Khac Long. "Multiscale analysis of transport in porous media." Thesis, Aix-Marseille, 2019. http://theses.univ-amu.fr.lama.univ-amu.fr/190522_NGUYEN_156sqbpnr595zlxet195ycj854nvqyn_TH.pdf.

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La corrélation entre les propriétés structurales des matériaux et les propriétés de transport d’un fluide à travers les matériaux poreux intervient dans de nombreux procédés en physique, chimie, géologie et ingénierie. Les propriétés telles que la porosité et la distribution de taille de pore ne reflètent pas la complexité du réseau poreux qui consiste en un réseau de pores interconnectés irrégulier et de différentes sections. La complexité est décrite par un paramètre appelé la tortuosité. La tortuosité est déterminé par des mesures électriques ou par chromatographie liquide. En chromatograph
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Li, Shimin. "Modeling biocolloid transport in saturated porous media." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186407.

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A forced-gradient experiment of virus and carboxylated microsphere transport was carried out at a two-well system in saturated aquifer at Borden, Ontario. The purpose of experiment was to qualitatively and quantitatively investigate bacteriophage transport relative to that of a conservative solute in porous media. A simplified plane radial advection dispersion equation coupled with reversible first-order and equilibrium mass transfer was found to be adequate to simulate the attachment and transport process. For simulating detachment and transport, all rate parameters were varied with time up/d
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Jewett, David Gordon. "Bacterial transport in variably saturated porous media." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187285.

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The transport of Pseudomonas fluorescens strain P17 through saturated and unsaturated porous media was investigated. Continuous-flow column experiments examined the effects of ionic strength and pH on P17 transport in saturated porous media. Bacterial penetration was measured and filtration theory was used to calculate bacterial collision efficiencies (ɑ). A decrease in ionic strength from 10⁻¹ to 10⁻⁵ M produced an approximately 90% decrease in bacterial ɑ's (from 0.12 to 0.015). This change in a is consistent with double-layer theory, but suggests that very large changes in ionic strength ar
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46

NASSI, Marianna. "Reactive transport of pollutants in porous media." Doctoral thesis, Università degli studi di Ferrara, 2012. http://hdl.handle.net/11392/2389259.

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Accidental or deliberate crude oil spills have been, and still continue to be, a significant source of environmental pollution, and pose a serious environmental problem, due to the possibility of air, water and soil contamination. Chlorinated volatile organic compounds (VOCs), such as 1,1-dichloroethylene (DCE) and aromatic hydrocarbons, BTEX (benzene, toluene, ethyl benzene and xylene) constitute a significant fraction of hazardous air and water pollution. Human beings are exposed to elevated levels of a wide spectrum of VOCs, many of which have been found to be toxic and potentially carcinog
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47

Ayalur-Karunakaran, Santhosh, and Siegfried Stapf. "Poly (dimethyl siloxane) films in porous media." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192162.

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Poly (Dimethyl siloxane) thin films were prepared by solvent evaporation method in porous alumina hosts. The thickness of these layers ranged from multilayer to sub-monolayer. Different NMR methods (FFC relaxometry, transverse relaxation, 1H Double quantum NMR) were applied to study the dynamics and order in these thin films. We found that dynamic restrictions and order increased with decreasing layer size. The increase of a short component of T2 from CPMG curves was attributed to the thawing of the adsorbed chains as seen in the decrease of the short component from Hahn echoes.
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48

PASSOS, NATHALIA CHRISTINA DE SOUZA TAVARES. "NUMERICAL MODELLING OF TWO-PHASE FLOW IN FRACTURED POROUS MEDIA WITH FLUIDMECHANICAL COUPLING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36897@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Esse trabalho apresenta um modelo numérico para a análise de processos acoplados de efeitos mecânicos e escoamento bifásico em meios porosos fraturados, com a utilização de diferentes métodos numéricos combinados (Elementos finitos contínuos e descontínuos), e utilizando uma mesma malha de elementos finitos para representar uma célula de modelo de simulação de reservatório. As descontinuidades são inseridas na malha como elementos de nós duplicados colapsados. Empregam-se proc
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49

Avesani, Diego. "A new Lagrangian method for transport in porous media (to model chemotaxis in porous media)." Doctoral thesis, Università degli studi di Trento, 2014. https://hdl.handle.net/11572/367738.

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As recently shown in laboratory bench scale experiments, chemotaxis, i.e.the movement of microorganisms toward or away from the concentration gradient of a chemical species, could have a fundamental role in the transport of bacteria through saturated porous media. Chemotactic bacteria could enhance bioremediation by directing their own motions to residual contaminants in less conductive zones in aquifers. The aim of the present work is to develop a proper numerical scheme to define and to quantify the magnitude and the role of chemotaxis in the complex groundwater system framework. We present
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50

Avesani, Diego. "A new Lagrangian method for transport in porous media (to model chemotaxis in porous media)." Doctoral thesis, University of Trento, 2014. http://eprints-phd.biblio.unitn.it/1288/1/avesani_tesi.pdf.

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As recently shown in laboratory bench scale experiments, chemotaxis, i.e.the movement of microorganisms toward or away from the concentration gradient of a chemical species, could have a fundamental role in the transport of bacteria through saturated porous media. Chemotactic bacteria could enhance bioremediation by directing their own motions to residual contaminants in less conductive zones in aquifers. The aim of the present work is to develop a proper numerical scheme to define and to quantify the magnitude and the role of chemotaxis in the complex groundwater system framework. We present
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