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 17 of 17 for “"effective conductivity"”.
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Computational Study of the Effect of Interparticle Contact in Conductive Properties of Random Particulate Systems
<p>The effective conductivity of random particulate material system is computationally investigated using the Monte Carlo scheme and finite element method. A cubic system consisting of randomly-dispersed, equal-sized, deformable ellipsoids are modeled in this study. The steady-state conduction …
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Effective properties for flow in heterogeneous porous media
… 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 mean behavior of heterogeneous flows. Effective parameters were evaluated numerically and were …
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A droplet evaporation model for high temperature and pressure spray applications
… transfer in the liquid is calculated using the effective conductivity model which accounts for internal circulation. The single droplet evaporation model has been implemented and tested into the KIVA multidimensional simulation which models gas flows, sprays, and chemical reactions in internal …
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A novel method for the continuous separation of microorganisms based on electrical properties
… (DEP) and media with spatially varying conductivity to separate cells based upon their effective conductivity. Our target application is the separation of Escherichia coli based upon the amount of the intracellular polymer poly(hydroxybutyrate) that each cell contains. This thesis …
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Electrical characterization of leukocyte activation for monitoring sepsis progression using dielectrophoresis
… both IDS and DEP spring method: an increase in effective conductivity of activated neutrophils at higher frequencies (above 5MHz). We then developed an electrical model and an experiment pipeline of inhibiting neutrophil functions to hypothesize the underlying mechanism. Using the blood samples …
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Mass transfer and dispersion processes in connected conductivity structures : simulation, visualization, delineation and application
… tailing, in solute transport, and on hydraulic conductivity heterogeneity. Macrodispersive theory, generally used to incorporate heterogeneity into solute transport, does not account for this tailing and makes assumptions about the structural characteristics of the heterogeneity, specifically …
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Continuum modeling of particle suspension conductivity
… conductive particles imparts electrical conductivity to an otherwise insulating medium. This effect can be used to great effect in many industrial applications. The ability to describe these networks and to predict their physical properties is a key step in designing systems that rely on …
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Simulating complex conductivity in carbonate rocks: using digital carbonate rocks and comparison to laboratory measurements
… Our focus is the simulation of the complex conductivity of carbonate reservoir rocks using reconstructed 3D rock structures from high-resolution X-ray micro computed tomography (micro-CT). Carbonate core samples with varying lithofacies and pore structures from the Cambro-Ordovician Arbuckle …
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Stochastic flow and transport through multifractal porous media
… that is accurate for flow fields with log-conductivity variance cr2 less than unity. Several studies have found that the linear perturbation ignores terms that have significant effects on the spectra of the hydraulic gradient VH and specific discharge q when (Y2 exceeds unity. In this …
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Measurement and modeling of in-cylinder heat transfer with inflow-produced turbulence
… transfer model by replacing the laminar thermal conductivity with a time varying effective turbulent thermal conductivity. The varying component of the effective thermal conductivity is assumed to be small relative to the mean component, allowing the use of a perturbation method. Two Nusselt …
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Solution of a Second Order Elliptic Partial Differential Equation with Varying Complex Coefficients: An Application for Computing Effective Complex Electrical Properties of Materials represented by 3D Images
… electrical properties. The computing of complex effective permittivity and complex effective conductivity of materials plays an important role due to its applications in different fields. The response of these properties under the influence of an alternating current field is used to characterise …
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Solution of a Second Order Elliptic Partial Differential Equation with Varying Complex Coefficients: An Application for Computing Effective Complex Electrical Properties of Materials represented by 3D Images
… electrical properties. The computing of complex effective permittivity and complex effective conductivity of materials plays an important role due to its applications in different fields. The response of these properties under the influence of an alternating current field is used to characterise …
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Numerical modeling of laser-induced melting and drilling of bulk and powder metals using combined smoothed particle hydrodynamics and ray tracing method
… applied to study thermal transport and calculate effective conductivity in a linear chain of powder grains, two-dimensional, and three-dimensional random powder systems composed of spherical grains and high-aspect-ratio spherocylinders, and in a nanocomposite material with carbon nanotubes and …
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MULTI-LAYERED, VARIABLE POROSITY SOLID- STATE LITHIUM-ION ELECTROLYTES: RELATIONSHIP BETWEEN MICROSTRUCTURE AND LITHIUM-ION BATTERY PERFORMANCE
… fraction and bottlenecks as primary limiters on effective conductivity, followed by geometric tortuosity. Notably, a template-based porous microstructure displayed a low tortuosity plane and a high tortuosity direction, as opposed to the more homogenous tape-cast porous microstructures. To …
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Non-invasive Measurement of Cholesterol in Human Blood by Impedance Technique: an Investigation by Finite Element Field Modelling
… has been proven to be successful replacement of effective conductivity method, used in the past. It has been tested against variation in physiological parameters, such as particle concentration and distribution, and material properties, such as particle ,conductivities. In 3D modelling cases the …
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Electrohydrodynamic interactions of colloidal particles undergoing Quincke rotation
… rotation lies in its ability to modify the effective rheological properties of suspensions under flow. When a suspension undergoing Quincke rotation is subjected to a steady shear flow, its apparent viscosity has been shown to decrease as a result of the enhanced rotation rate of the …
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An On-orbit Calibration Procedure for Spaceborne Microwave Radiometers Using Special Spacecraft Attitude Maneuvers
This dissertation revisits, develops, and documents methods that can be used to calibrate spaceborne microwave radiometers once in orbit. The on-orbit calibration methods discussed within this dissertation can provide accurate and early results by utilizing Calibration Attitude Maneuvers (CAM), …