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 20 of 85 for “"pore scale"”.
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Pore Scale Simulation of Transport in Porous Media
… zones, which may result e.g. from dead-end pores or pores perpendicular to the direction of the flow. A program to simulate transport in porous media was developed and verified using several test-problems. An example calculation with a randomly generated porous medium was performed. The …
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Pore-scale Interfacial and Transport Phenomena in Hydrocarbon Reservoirs
… in these reservoirs. This dissertation performs pore-scale studies of interfacial thermodynamics and multiphase hydrodynamics in shale reservoirs and conventional oil-brine-rock (OBR) systems. In shale gas reservoirs, the imbibition of water through surface hydration into gas-filled mica pores …
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Pore-scale Study of Flow and Transport in Energy Georeservoirs
… that there was stronger anisotropy in larger pore networks that were primarily occupied by the non-wetting fluid. This study advances the fundamental understanding of the multiphysics processes associated with multiphase flow in geologic materials and provides insight into upscaling …
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Pore-scale characterization of rock images: geometrical analysis and hydrodynamic simulation
L'abstract è presente nell'allegato / the abstract is in the attachment
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Pore-scale simulation frameworks for flow and transport in complex porous media
… of better oil and gas recovery processes. Pore-scale simulations, with the advent of advanced algorithms and parallel computing, have become indispensable tools to average the microscopic mechanisms and uncover the macroscopic behaviors. In order to perform direct numerical simulations of …
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Mechanistic modelling of bioavailability: putting soil microbiology in its pore scale context
… structural characteristics of soil at the micro-scale. Data extracted from the CT imaged soil samples were extracted to parameterise the model and thus the simulated soil structures were validated against the original CT imaged structure using the quantification metrics. In general, the model …
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Multiphysics Transport in Heterogeneous Media: from Pore-Scale Modeling to Deep Learning
… of these applications. In this dissertation, nanoscale transport phenomena in porous media are studied through physics-based simulations, and the effective solution of forward and inverse transport phenomena problems in heterogeneous media is tackled using data-driven, deep learning approaches. …
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Pore-scale dynamics of immiscible two-phase flow on porous and fractured media
Pore-scale investigations of immiscible two-phase flow displacement dynamics in porous media provides crucial information to natural and industrial processes such as nonaqueous phase liquid (NAPL) contamination of groundwater, carbon dioxide injection and storage, and enhanced oil recovery (EOR) …
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Two-Phase Flow at the Pore-Scale Using the Volume of Fluid Method
… for understanding flow through porous media. Pore-scale simulations were conducted using the Finite Volume method to solve the Navier-Stokes equations, and the Volume of Fluid method for capturing interface. A workflow is provided, in which primary drainage simulations are performed in order …
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Analysis of Pore -Scale Nonaqueous Phase Liquid Dissolution in Etched Silicon Pore Network
… these mass transfer coefficients varied with pore and NAPL blob geometry. Specifically, the mass transfer coefficient decreased with increasing blob size because larger blobs had more NAPL-water interfacial area not adjacent to flowing water, and with decreasing pore throat width to pore …
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A Pore Scale Study of Substrate Mixing and Biological Degradation in Porous Media
… flow field are compared to results from the full pore scale model. Substrate degradation rates are consistently underpredicted when transverse dispersion coefficients obtained from nonreactive transport simulations are used for reactive transport. The continuum model with values of transverse …
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Modeling the flow of non-Newtonian fluids in packed beds at the pore scale
… to modeling such processes is at the continuum scale. Semi-empirical expressions, such as Darcy's law, are substituted for velocity in the continuity equation, which is then coupled with a momentum, mass, and energy balance. While a continuum approach is acceptable in some cases, additional …
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Image-Based Pore-Scale Modeling of Inertial Flow in Porous Media and Propped Fractures
… flow and fundamentally understanding the pore-scale inertial flow is important to oil and gas production in hydraulic fractures. Image-based pore-scale modeling is a powerful approach to obtain macroscopic transport properties of porous media, which are traditionally obtained from …
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Improving capabilities of pore-scale modeling of multiphase flow for geological storage of CO2
… framework to address current challenges in pore-scale modeling of two-phase flow with applications to sequestration of carbon dioxide (CO2) in deep saline geological formations. These formations are widely available and have relatively high storage capacity to host injected CO2 for long-term …
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Effects of pore-scale fluid flow on fluid-solid reactions in porous and fractured media
… structures, such as recirculating flows. Such pore-scale flow structures can significantly alter fluid-solid reactions by controlling the pore-scale concentration fields. In addition, recent studies have shown that the recirculating flow topology differs between two-dimensional (2D) and …
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Analysis of Solute Mixing at the Pore-Scale Using Micromodels and Lattice -Boltzmann Finite Volume Modeling
… bi-molecular reaction utilizing a combination of pore scale modeling and high-resolution 2D micromodels. To evaluate reactive transport, two reactive substrates are introduced into a network of pores via two separate and parallel fluid streams. The substrates mix within the porous media via …
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Pore-scale characterization of transverse mixing-induced calcium carbonate precipitation of relevance to geological carbon sequestration
… a flow channel with an imprinted homogeneous pore structure to replicate the porous nature of groundwater flow. Sodium carbonate and calcium chloride were injected in to this model to form a calcium carbonate precipitate. The experiment was run and analyzed visually as well as analytically …
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Development of a pore-scale model for simulating two and three phase capillary pressure-saturation relationships
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1991.
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Prediction of Capillary Pressure and Relative Permeability Curves using Conventional Pore-scale Displacements and Artificial Neural Networks
Traditional network models use simplified pore geometries to simulate multiphase flow using semi-analytical correlation-based approaches. In this work, we aim at improving these models by (I) extending the numerical methodologies to account for pore geometries with convex polygon cross sections and …
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