Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"heterogeneous porous media"”.
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Scale dependent dispersion in heterogeneous porous media
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1992.
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Nanoparticle Transport Through Fractures And Heterogeneous Porous Media
… through fractures and high permeable zones in heterogeneous porous media. Using carbon based 2-5 nm particles (C-Dots); we inject dual tracers at different flow rates into a permeable core channel (fracture). The KBr tracer has time to diffuse into the surrounding halo much more than the …
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Effective properties for flow in heterogeneous porous media
… at local scale on the mean behavior of heterogeneous flows were investigated via Monte Carlo method. Assuming log-normal distribution of conductivity and capillary pressure head being a stochastic process, the mean behavior model defined by effective properties was derived to predict the …
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Numerical Approximation of Multiphase Flows in Heterogeneous Porous Media
… approximating multiphase flow problems in highly heterogeneous porous media. We first highlight important background information, motivations, governing equations, and past results to the numerical analysis of such problems. Second, we introduce a discontinuous finite element discretization, …
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Effective properties of multiphase flow in heterogeneous porous media
The impact of heterogeneity on multiphase fl.ow is explored using a spectral perturbation technique employing a stationary, stochastic representation of the spatial variability of soil properties. A derivation of the system's effective properties - nonwetting phase moisture content, capillary …
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Geo-Informed Deep Learning for Spatial Downscaling of Solute Transport in Heterogeneous Porous Media
Resolving solute transport in heterogeneous porous media is a complex phenomena as it encounters a data sparsity challenge when investigated experimentally and a computational cost challenge when simulated numerically. This work proposes a unique two-stage deep learning architecture comprising a …
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Sorption and Biodegradation of Organic Solutes Undergoing Transport in Laboratory-scale and Field-scale Heterogeneous Porous Media.
The first study focused on the magnitude and rate of sorption of hydrophobic organic compounds by two, well-characterized soils. The composition of organic matter had a small effect on the magnitude of the organic carbon normalized equilibrium distribution coefficients. The sorbates sorbed more …
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Influence of Soil Moisture Dynamics on DNAPL Spill Zone Architecture and Its Impact on Mass Removal Mechanisms During Soil Vapor Extraction in Heterogeneous Porous Media
… for the migration and distribution of DNAPL in heterogeneous porous media for different NAPL and water loading histories (i.e., soil moisture dynamics). A 2-D vertical cross-section with layered heterogeneity mimicking the Hanford Site was assumed. In cases of co-disposal of NAPL with large …
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A Study of Residual Oil Saturation in Heterogeneous Sandstone Experiments
… oil saturation reduction by polymerflood in heterogeneous porous media is studied. A compositional chemical flooding simulator (UTCHEM) using high resolution numerical method was used to simulate the previous coreflooding experiments as well as to study the sensitivity of different parameters …
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Boiling heat transfer in porous media with/without chimneys
To evaluate the effects of porous deposits over a heating surface on the boiling heat transfer in light water nuclear power reactors, a detailed numerical modeling and evaluation study was conducted. The processes of boiling heat transfer in the porous corrosion deposits deal with two-phase flows …
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Estudos em meio poroso heterogêneo sujeito a bombeamentos periódicos
… of this work is the behavioral study of a heterogeneous porous media, when it suffers an unsteady periodic pumping. For this, we built a special equipment and moulded an artificial porous media to which was applied a steady contour condition upstream and the unsteady pumping was made …
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Transport of solutes in complex hydrogeological media
… of conservative solute transport in a complex heterogeneous porous media. A methodology to incorporate all the available information for describing the heterogeneity is developed. A Particle Tracking Random Walk method is used to simulate the solute transport through a heterogeneous hydraulic …
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Upscaling reactive transport in porous media : laboratory visualization and stochastic models
… assumes complete mixing. Mixing in natural porous media is a slow process that can control the overall rate of chemical reactions, and the lack of mixing causes concentrations to be spatially variable. This thesis develops and experimentally validates a new solute transport modeling …
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Flow and mixing in complex porous media
The flow and mixing of fluids in complex porous media is important in a large range of environmental settings, from groundwater flows to the geological storage of carbon dioxide (CO$_2$). This thesis investigates two distinct and fundamental features of such flows; the mixing of miscible fluids of …
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Multi-scale Investigations of Geological Carbon Sequestration in Deep Saline Aquifers
… on the role of wettability on multiphase flow in porous media, density-driven convection in porous media, and their implications for GCS in deep saline aquifers. Wettability is a critical control over multiphase fluid flow in porous media. However, our understanding on the wettability …
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Numerical studies of reactive polymer flows in porous materials
… new numerical model of reactive polymer flow in heterogeneous porous media. A moment representation of the log-normal polymer molecular weight distribution is used to model polymer as a multi-component species. Three leading moments are used to simulate the polymer transport and reaction …
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Pore scale study of crude oil distribution and interfacial processes in unconsolidated porous media: an application of synchrotron x-ray microtomography
… distribution and morphology in three types of porous media with increasing heterogeneity (in grain size distribution) during sequential surfactant flooding episodes. Multiple columns, packed with three types of sand, were established with residual saturations of light, heavy, and extra-heavy …
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Physical and Deep-Learning-Based Explorations of Microbe-Mediated Reactive Transport Processes in Porous Media Across Scales
… this work investigates microbial motility in porous microfluidic devices, a comparison of particle tracking methods in porous media, and an investigation of biomass growth and chromium reduction in the hyporheic zone. Furthermore, this dissertation details the development and …
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Reduced-Order Modelling and Observations of Geological Carbon Dioxide Storage
… rate at which CO2 dissolves when injected into heterogeneous saline aquifers. As CO2 dissolves into brine, the density of the brine is increased, thereby acting as a mechanism for the stable trapping of CO2. CO2 injected into heterogeneous geological formations results in preferential migration …