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 22 for “"Transfer Parameters"”.
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The isolation and study of rheological and mass transfer parameters in the spinning of advanced hollow fibre membranes for gas separation
… was to study in detail the fundamental parameters of extrusion shear and forced convection residence time in the dry gap in dry/wet spinning of hollow fibre gas separation membranes. To achieve this, studies were undertaken in which extrusion shear and forced convection residence time …
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Investigation of the Effects of Sequential Anaerobic, Anoxic and Aerobic Zones on Dissolved Oxygen Transfer Parameters in a biological Nutrient Removal Pilot Plant
… scale determinations of the volumetric oxygen transfer coefficient, K<sub>L</sub>a, were performed on an improved A²/O biological nutrient removal (BNR) pilot plant. Effluent from a full scale primary clarifier, used as pilot plant influent, was found to have an alpha (ratio of process to clean …
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Environmental transfer of radionuclides in a Sub-Saharan Africa setting
… adequately assessed, knowledge of radionuclide transfer within SSA ecosystems is required. Most of the research undertaken to date on radionuclide transfer to humans and wildlife has focused on studies within Europe and North America. These studies have provided data which form the basis of the …
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Investigating the Effects of Sparger Design in Column Photobioreactors
… profiles and additional hydrodynamic and heat transfer parameters in these photobioreactors. The gas bubbles and the water-based media within the photobioreactor are modeled using the Lagrangian-Eulerian approach. A low Reynolds k-Epsilon turbulence model is used to predict near-wall flow …
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A heat transfer model applicable to the refuelling process for natural gas vehicles
This research presents a study of transient heat transfer phenomena taking place between a storage cylinder and the incoming gas during the cylinder charging process. A theoretical model of convective heat transfer between the gas and the cylinder is described. Experiments with the high pressure …
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Excited states and electron transfer in solution : models based on density functional theory
… to predict excitation energies and electron transfer parameters in organic chromophores and semiconductors in solution. First, we apply constrained DFT to characterize charge recombination in a photoexcited donor-acceptor dyad and to understand the photophysical behavior of a fluorescent …
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Adaptive strategy for one-sided communication in MPICH2
… because it allows the sender to specify all data transfer parameters and avoids the receiver to be explicitly involved in data receiving. One-sided communication model also has potential to provide higher performance. The MPI-2 standard provides flexibility about when RMA operations can be issued …
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Diffusion and reaction of nitric oxide in cell cultures
… on independently determined kinetics and mass transfer parameters were found to be in good agreement with the experimental results for the concentration of NO in bulk solution, nitrite and nitrate accumulation rate, as well as the NO loss to the head space. The coupling between reaction and …
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Growth and motion at the Weddell Sea ice edge
… would imply for congelation ice. Momentum transfer parameters were found to be similar<br/>to those found for the Greenland Sea Odden ice tongue.<br/>Pancakes were found to be dominantly thickened by over-topping of the surrounding<br/>frazil ice crystals, termed ‘scavenging’, and gave rise …
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Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase. Experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitatated semi-batch gas/liquid reactor.
… which occur in the liquid phase, and mass transfer from the gas to the liquid phase. This study focuses on two aspects: mass transfer and chemical reactions in multicomponent systems. The mass transfer parameters were determined by experiments under different conditions and the chemical …
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Experimental study of heat flux partitioning in pressurized subcooled flow boiling
… analyzed to determine fundamental boiling heat transfer parameters such as the nucleation site density, growth and wait times, nucleation frequency, departure diameter as well as the partitioning of the wall heat flux. While established mechanistic models can capture the trends of growth time …
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Heat Transfer and Film Cooling Performance on a Transonic Converging Nozzle Guide Vane Endwall With Purge Jet Cooling and Dual Cavity Slashface Leakage
… analyzed by comparing key convective heat transfer parameters. Data is collected and reduced using a combination of IR thermography and a linear regression technique to map endwall heat transfer performance throughout the passage. A flow visualization study is employed using 100 cSt …
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Polonium-210 in Freshwater Environments: Analytical Advances, Predictive Modelling, Food Web Transfer and Dose Assessment
… environmental behaviour and biological transfer in freshwater ecosystems remain poorly characterized. Advances in understanding have been constrained by analytical challenges and by radiation protection frameworks that historically emphasized human health, with ecological risks only more …
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Improved Experimental and Mathematical Techniques for Measurement of Solvent Gas Diffusivity in Heavy Oils
… diffusion coefficient. Measurements of mass transfer characteristic are often more difficult due to difficulties in measuring point values of concentration and other issues which complicate this transport process such as phase equilibrium, effect of convective transport and having a mixture …
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Environmental effects on the rate of electron transfer in mixed-valence molecules
… effect on the rate of intramolecular electron transfer. For 1$\sp\prime$,1$\sp{\prime\prime\prime}$-dimethylbiferrocenium triiodide hemi(iodine) it was found that the environment imposed by the I$\sb{8\sp-}$ anion was nearly symmetric (space group C2), and variable temperature $\sp{57}$Fe …
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Quantification of Parameters in Models for Contaminant Dissolution and Desorption in Groundwater
… significant challenges faced when modeling mass transfer from contaminant source zones is uncertainty regarding parameter estimates. These rate parameters are of particular importance because they control the connectivity between a simulated contaminant source zone and the aqueous phase. Where …
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Characterization of Internal Formaldehyde Production within The Pandora Spectrometer Instrument
… The second part of the thesis characterizes heat transfer processes within the telescope assembly to estimate internal temperature as a function of ambient meteorological conditions. Considering that the Pandora instruments have mostly identical design of their telescope assemblies heat transfer …
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Modeling the Dissolution of Immiscible Contaminants in Groundwater for Decision Support
… the mathematical simulation of field-scale mass transfer processes. Effective methods for simulating NAPL dissolution must therefore be able to assimilate a variety of data through physical and scalable mass transfer parameters to quantify and reduce site-specific uncertainties. This …
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Heat transfer and microstructure during the early stages of solidification of metals
… for a given set of conditions Linking heat transfer to cast structure is an invaluable aspect of a fully predictive model, which is of particular importance for near-net-shape casting where the product reliability and application are so dependent on the solidification phenomena. This study …
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Mass transfer coefficients and effective area of packing
The effective mass transfer area (a [subscript e]), liquid film mass transfer coefficient (k [subscript L]), and gas film mass transfer coefficient (k [subscript G]) of eleven structured packings and three random packings were measured consistently in a 0.428 m packed column. Absorption of CO₂ with …
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