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 9 of 9 for “"Mixing zones"”.
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Understanding Formation and Transport of Amorphous Iron Oxyhydroxides in Porous Media using Microfluidic Flow Cells- a Novel Method to Study Freshwater Iron Cycling
… these two distinct hydrological components. The mixing zone is characterized by a near neutral pH, ambient temperature and a sharp oxygen concentration which in turn has deep impact on the iron cycling and thus the fate of contaminants in the water column. We constructed an experimental …
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Application of chemical kinetic modeling to improve design and performance criteria for a practical incineration system
… effort considered the effects of non-ideal mixing on detailed thermo-kinetic, simulations. Specifically, an alternate approach was developed to solve the Partially Stirred Reactor (PaSR) model that allowed the incorporation of large detailed mechanisms. Both ideal and non-ideal modeling …
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A three dimension hyporheic model of the River Bure: Understanding the nutrient dynamics and the role of streambed heterogeneity
… zone is often defined as the zone where mixing of surface water and groundwater occurs in shallow sediments beneath and adjacent to rivers. This mixing contributes to create unique biogeochemical conditions that may attenuate contaminants from either upstream surface water or groundwater …
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Integrating thermoelectric power generation operations with aquatic ecosystem sustainability
… methodology was developed that utilizes plume mixing and probability distribution analyses with temperature and flow data for both a power plant's discharge and the adjoining river. 2D probability risk spaces were created that quantify the probability of exceeding a given temperature. The …
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Mixing and Attenuation of Upwelling Groundwater Contaminants in the Hyporheic Zone
… but few studies have explored the controls on mixing of upwelling groundwater water in the hyporheic zone and its potential to foster mixing-dependent reactions. The goals of this dissertation are therefore to evaluate the effects of (1) hydraulic controls and (2) reaction kinetic controls on …
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Design of Flow Reactors for the Continuous Synthesis of Nanoparticles
… 7.3 2.2 nm and 2.1 0.5 nm by controlling mixing efficiency and speciation of gold precursor. In order to understand the effect of mixing on the size of Au NPs, a novel CFD method is established based on a published algorithm to simulate the accurate concentration distribution, avoiding …
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Crystal growth and nucleation kinetics of diethylenetriammonium hexachlororhodate (III) salt
… eliminate kinetic biases that may be caused by mixing at the mesoscale. Transient saturation in the CSTR ranged up to 43, and in the PFR saturation was varied between 2 and 64. Precipitation kinetic parameters were estimated through data fitting concentration and volume average crystal size …
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The hydrodynamic evolution of the Maketū Estuary after the re-diversion of the Kaituna River
… added freshwater flow. To better understand the mixing patterns within the estuary, Estuarine Richardson number (R_iE) was calculated at 3 main sites before and after both stages of re-diversion. R_iE increased after Stage 1, but not sufficiently to cause a shift in classification; therefore, the …
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Numerical Simulations of Multi-Confined Jets in Crossflow at Supercritical Pressure
… of this study was to numerically investigate the mixing characteristics of two and three confined jets in crossflow (JICF) at supercritical pressure using K-ℇ and K-ꞷ turbulence models as well as the Large Eddy Simulation (LES) method using Siemens CCM+ software. The JICF has many applications …