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 24 for “"Pore geometry"”.
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Development of a Predictive and Mechanistic Model for Capacitive Deionization
… was modified to account for finite ion size and pore geometry by including the Carnahan-Starling (CS) equation of state and considering boundary conditions resulting from difference in pore shape and size and the subsequent impact on potential and concentration profiles. This GCS-CS model with …
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Description and reconstruction of microscopic random heterogenous media in order to estimate macroscopic hydraulic functions
… boron silicate glass. Based on the measured pore geometry (with x-ray tomography), a lattice-Boltzmann Navier-Stokes equation solver was used to calculate the velocity field and the hydraulic conductivity. Additionally, the pressure-saturation relation of a primary drainage process was …
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Effect of soil structure on temporal and spatial dynamics of bacteria
… altered to manipulate the characteristics of the pore volume where bacteria reside and through which distribution of solutes and nutrients is controlled. X-ray CT was used to characterise the pore geometry of repacked soil microcosms. Soil porosity, connectivity and soil-pore interface area …
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Selective laser sintering of bioactive glass scaffolds and their biological assessment for bone repair
… sintering (SLS) process, provides control over pore interconnectivity, pore geometry, and the overall shape of the scaffold, which aids in repairing different regions of the bone. The main objectives of this dissertation were to develop bioactive glass (BG) scaffolds using the SLS process and …
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Transport and seismoelectric properties of porous permeable rock : numerical modeling and laboratory measurements
… of rock transport properties, together with pore geometry, can aid us to better quantify the frequency dependence of its SE coupling coefficient. With the development of micro-CT (pCT) scanners, microstructure of the sedimentary rock can now be obtained in three dimensions at micron level …
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The prediction of flux decline in cross-flow microfilters via three-dimensional fluid dynamic models of tortuous pore structure
… develops a fluid dynamic model of the tortuous pore geometry to simulate the progression of fouling and investigate the associated effect on flux decline. A three-dimensional tortuous pore geometry was created to study the development of fouling mechanisms via a fluid dynamic model. The geometry …
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The effects of porosity on the out-of-plane tensile strength of laminated composites
… increasing void content. The volume fraction of pores, pore geometry, size, and orientation were determined for a representative number of specimens by metallography and optical analysis methods. This data was combined with the out-of-plane tensile data and used in the theoretical model, prepared …
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Indirect Tissue Scaffold Fabrication via Additive Manufacturing and Biomimetic Mineralization
… scaffolds with controlled porosity and pore geometry (meso-structure). However, due to the relatively few biocompatible materials available for processing in AM machines, direct fabrication of tissue scaffolds is limited. To alleviate material limitations and improve feature resolution, …
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Computational Modeling of Claudin-15 Paracellular Channels
… yet the molecular basis of strand flexibility, pore architecture, and ion selectivity for cation-selective claudin-15 (Cldn-15) remains incompletely defined at atomic resolution. This dissertation employs molecular dynamics (MD) simulations, reduced computational modeling, and cryo-electron …
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Simulating complex conductivity in carbonate rocks: using digital carbonate rocks and comparison to laboratory measurements
… core samples with varying lithofacies and pore structures from the Cambro-Ordovician Arbuckle Group and the Upper Pennsylvanian Lansing-Kansas City Group in Kansas were used in this study. The wide variations in pore geometry and connectivity of these samples were imaged using micro-CT. A …
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Gasification and combustion modeling for porous char particles
… char particles often possess a wide range of pore sizes and react under varying operating conditions, predictive models which can account for the numerous physical and chemical processes and time-dependent boundary conditions to which a particle is subjected are necessary. A comprehensive, …
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Optimisation of Valve Regulated Lead Acid Battery Design for High Power Applications
… self-discharge. To identify the causes of pore blocking effect that occurred in the low performance positive active material it was necessary to develop a mathematical model system to detect the real pore geometry. In the first instance, to ensure that the cells studied in this …
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The influence of micro-porosity on drainage relative permeability using digital core analysis
… acquired from X-ray micro-tomography provide 3D pore geometry on which flow and transport properties can be computed. However, these images exhibit limited resolution in particular if field of view needs to be optimised at the same time. Constrained by the image resolution, the pore space is …
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Wettability assessment using resistivity and NMR measurements
… models were introduced and verified using pore-scale simulations. The work presented in this thesis verifies their applicability to core-scale measurements. Additionally, a resistivity-based wettability index is introduced using the fraction of hydrocarbon-wet grains. This index is …
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OBSERVATION AND MODELLING OF FLUID TRANSPORT INTO POROUS PAPER COATING STRUCTURES
… that it is necessary to characterise both the pore-level structure and the permeability of the network simultaneously. To remove indeterminate effects caused by the usually uneven thin layers of coatings adopted in practice, a novel methodology was developed in this work comprising of a range …
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Tuning The Properties Of Soft Materials Through Extreme Nanoconfinement
… NPs, significantly increases with decreasing pore size such that the Tg increases by up to 50 K in 11 nm NP packings, while Tg is close to the bulk Tg in 100 nm NP packings. Such effect on Tg is almost independent of molecular weight. For Poly(2-vinylpyridine)(P2VP)/SiO2 CaRI films, a ~100 K …
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Optimizing adsorbents for heat storage applications : estimation of thermodynamic limits and Monte Carlo simulations of water adsorption in nanopores
… sites and a Lennard-Jones core. A slit pore geometry is considered for the microporous solid. In a computationally demanding parametric study, the influence of pore width and the distribution of hydrophilic surface sites on adsorption equilibria of the model system are analyzed. It is …
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Transition between Flow Regimes in Porous Media Using Magnetic Resonance Velocimetry: From Laminar to Turbulent
… fluid dynamics was derived based on the pore-scale flow visualisation using magnetic resonance velocimetry (MRV). Spiral imaging was selected as the ultrafast imaging protocol to probe the transient phenomena, and the acquisition was further accelerated by combining subsampling and …
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Solute dispersion in selected tropical soils
… to differences in ion adsorption capacity and pore geometry. Tritium showed negligible interaction with these soils and was used to trace fluid dispersion. Tritium breakthrough curves differed because of different dead-end porosities of these soils and were estimated to range from 4 to 30 per …
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Synthesis and Characterization of Nanostructures in Porous Anodic Aluminum Oxide Templates
… metal nanostructures were investigated. The pore size, interpore distance, and pore geometry highly affect magnetic properties of nanostructures grown in the templates. Hexagonally ordered porous alumina templates can be fabricated by two-step anodization. The pore diameters and interpore …
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