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 18 of 18 for “"deposition model"”.
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Boundary layer transport of small particles
… smooth, flat, acrylic plate and their subsequent deposition was investigated. The velocity boundary layer over the flat plate was characterized for a wind tunnel mainstream velocity of 2 m/s. Particle deposition was quantified with respect to location on the experimental plate with a microscope. …
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Monte Carlo Simulations of the Electrodeposition of Copper From a Sulfate Solution in the Presence of Additives
A simple copper deposition model was developed and compared to the experimental results in three ways, qualitative visual comparisons, scaling analysis of the interface width and current time curves. Parametric studies were performed to make observations about the modeled copper system. A …
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Syngas ash deposition for a three row film cooled leading edge turbine vane
… and high gas stream velocities can cause Deposition, Erosion, and Corrosion (DEC) of turbine components downstream of the combustor section. The objective of this dissertation is to use computational techniques to investigate the dynamics of ash deposition in a leading edge vane geometry …
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Impact of Porous Media Grain Size on the Transport of Multiwalled Carbon Nanotubes
… conditions coupled with results of numerical modeling assess the suitability of traditional transport models to predict MWNT mobility. MWNTs were found to be mobile though porous media ranging from fine sand to silt. Findings suggest that a dual deposition model coupled with site blocking …
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Dynamical Sedimentary Models of Shallow Marine Environments
… of quantitative, dynamical sedimentary modeling to the analytical understanding of sedimentary processes in shallow marine environments. The dynamical sedimentary models in this treatise numerically simulate the sedimentary processes from an event time scale, based on the fundamental …
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Optical properties of nanostructured silicon-rich silicon dioxide
… the percentage of 02 in the gas mixture. A deposition model is presented which incorporates the physical and chemical aspects of the sputtering process to predict the film stoichiometry and deposition rate for variable deposition conditions. The as-deposited films are optically anisotropic …
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Numerical multiphysics modelling of Wick-Boiling in a crud with porosity variations to determine local Nickel Ferrite depositions within crud due to deep bed filtration
… are examined through a two-dimensional model. The multi-physics model is described by a coupled system of a thermal model, a momentum transfer model, a solute concentration transport model and a particle transport and absorption model. Various appropriate numerical methods were developed …
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Surface kinetics modeling of silicon oxide etching in fluorocarbon plasmas
… it is necessary to have an appropriate physical model to describe the surface kinetics including simultaneous etching and deposition. A novel surface kinetic model, the translating mixed-layer (TML) model, has been developed. ABACUSS II, a modeling environment and simulator was used for solving …
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Improved dynamics modelling for drainage sediment prediction and management
… the previous shortcomings of drainage sediment modelling required to be addressed. Most notably these included: single particle size limitation, impractical processing times; the use of purely granular analysis; and no feedback between sediment and hydraulic models.<br/><br/>A programme of data …
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Comprehensive throughflow method for steam turbine development
… a widely used stochastic wake-chopping model is implemented within a well-established throughflow framework, examining the impact of wake chopping on generated droplet size spectra and thermodynamic relaxation losses. A comprehensive sensitivity study of the predicted droplet spectra to …
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Genesis and Sedimentation of an Ice-Walled Lake Plain in Northeastern Illinois
… the sedimentology of the IWLP and iii) propose a depositional model for development of the IWLP. The study was conducted on a single IWLP in Newark, Illinois, located in the Marseilles Morainic System. Seventeen radiocarbon ages of tundra plant macrofossils were obtained from cores sampled across …
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Ignition and hydrodynamic ejections by laser-induced breakdowns
… of heat and radical species, laser-based energy deposition can be an effective ignition source, and its relative versatility and precision make it an attractive alternative to conventional ignition methods. Understanding of the breakdown-induced flow, its dependence on details of the plasma …
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A Study of Centrifugal Buoyancy and Particulate Deposition in a Two Pass Ribbed Duct for the Internal Cooling Passages of a Turbine Blade
… the particle trajectories together with a wall deposition model. The conditions used are Re=100,000, Rotation number, Ro = 0.0 and 0.2, and centrifugal Buoyancy parameters of Bo=0, 0.5, and 1.0. First, the independent effects of Coriolis and centrifugal buoyancy forces are investigated, with a …
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Investigation of Asphaltene Adsorption at Liquid-Liquid and Liquid-Solid Interfaces
… adsorption at the water-oil interface and their deposition onto the solid surfaces, and investigations are reported here on both these adsorption and deposition phenomena.</p> <p>Defined by their solubility (soluble in aromatic solvents but insoluble in n-alkanes), the asphaltenes form a class of …
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Large Eddy Simulations of Sand Transport and Deposition in the Internal Cooling Passages of Gas Turbine Blades
… is to investigate sand transport and deposition in the internal cooling passages of turbine blades. A simplified rectangular geometry is simulated to mimic the flow field, heat transfer and particle transport in a two pass internal cooling geometry. Two major challenges are identified …
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Effects of Acid Deposition and Changing Climate on the Hydrochemistry and Critical Loads of Watersheds in the Adirondack Region of New York
<p>Despite decreases in acidic deposition since the 1970s, the recovery of surface waters from acidification has been limited primarily due to the depletion of exchangeable base cations, net mineralization of organic sulfur and nitrogen and release of previously retained SO42- and NO3-, and …
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Exposure Matters: Examining The Physical And Psychological Health Impacts Of Toxic Contamination Using Gis And Survey Data
… survey (N=223) and environmental data (ash deposition patterns), this thesis employs path analysis to test the hypothesis that exposure matters. The exposure matters hypothesis suggests exposure (perceived, self-reported and actual) is a significant predictor of physical and psychological …