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 43 for “"Turbulent Diffusion"”.
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Turbulent diffusion of sodium vapor trails in the upper atmosphere
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1964.
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Point Source Turbulent Diffusion for an Air Flow in a Duct
Made available in DSpace on 2014-12-05T17:15:25Z (GMT). No. of bitstreams: 1 5801694.pdf: 3263997 bytes, checksum: e8544da0f5cba418fc7ef23bd37d1caf (MD5) Previous issue date: 1958
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Stabilization of the tearing mode by turbulent diffusion and runaway electrons
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1986.
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Flame Structure and Emissions of Strongly-Pulsed Turbulent Diffusion Flames with Swirl
This work studies the turbulent flame structure, the reaction-zone structure and the exhaust emissions of strongly-pulsed, non-premixed flames with co-flow swirl. The fuel injection is controlled by strongly-pulsing the fuel flow by a fast-response solenoid valve such that the fuel flow is …
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A Study of Ion Concentration Fluctuations in Turbulent Diffusion Flames using Correlation Techniques
… of non equilibrium ion chemical kinetics in a turbulent diffusion flame. In such a system the charged species undergo a chemical reaction concurrently with turbulent mixing. Where the chemical reaction rate is greater than the appropriate mixing rate it has been theoretically predicted that a …
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Flamelet modelling of soot formation in diffusion flames
… been applied to soot formation in laminar and turbulent diffusion flames. The aim was to study how different model parameters affect soot formation in diffusion flames. It was shown that certain assumptions are more crucial in laminar diffusion flames than in turbulent ones. The soot formation …
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Velocity moment analysis on oscillatory flow above self-formed vortex ripples
… mean velocities, root-mean-square speeds, turbulent kinetic energy, Reynolds shear stress, and higher order velocity moments including skewness factors, flatness factors, and turbulent diffusion factors were studied for nine different Reynolds numbers. The study on phase-averaged skewness …
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A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
… equations are developed for a stratified, turbulent Ekman layer in a combined wave and current flow over a moveable sediment bed. An eddy diffusivity closure scheme that includes the effect of suspended sediment, temperature, and salinity induced stratification on the vertical turbulent …
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A Field Study of Oceanic Turbulent Horizontal Diffusion.
Richardson's "four-thirds law" of horizontal diffusion was tested using aerial photography as a data gathering technique. Plywood floats and current crosses suspended both near the surface and at nine feet were used as diffusers. The scales investigated ranged from 10 to 525 meters. The …
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Numerical Investigation of turbulent coupling boundary layer of air-water interaction flow
… flow properties, such as mean velocity profiles, turbulent intensities, Reynolds stress and turbulent kinetic energy (TKE) budget terms show significant differences between air-water interface turbulence near the water side (IntT-w) and wall-bounded turbulence(WT) while there are some similarities …
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Systematic Prediction and Parametric Characterization of Thermo-Acoustic Instabilities in Premixed Gas Turbine Combustors
… of thermo-acoustic instabilities in a turbulent, swirl-stabilized research combustor using a stability model constructed from validated reduced-order component models. The component models included the acoustic response to flame heat release rate at various locations in the combustor, …
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Mechanisms of turbulent mixing in the Continental Shelf bottom boundary layer
… water flows. In this thesis, the problem of turbulent mixing in the coastal bottom boundary layer is investigated with a unique set of field measurements of velocity and sound speed that span a significant fraction of the boundary layer obtained over a six-week long period in the late summer …
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Mechanisms of turbulent mixing in the Continental Shelf bottom boundary layer
… water flows. In this thesis, the problem of turbulent mixing in the coastal bottom boundary layer is investigated with a unique set of field measurements of velocity and sound speed that span a significant fraction of the boundary layer obtained over a six-week long period in the late summer …
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Field and laboratory observations of small-scale dispersion in wetlands
… in nonlinear ways. Relevant processes include turbulent diffusion, which describes net solute flux created by turbulent eddies. Other dispersive processes result from the retardation of a portion of the solute relative to the rest of a cloud. This retardation can be provided by trapping in the …
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A Parallel Solution-Adaptive Method for Turbulent Non-Premixed Combusting Flows
… is proposed and applied to the predictions of turbulent non-premixed compressible combusting flows for both two and three space dimensions. The parallel solution-adaptive algorithm solves the system of partial-differential equations governing turbulent compressible flows of reactive thermally …
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The simulation of surface ship micro-bubble wakes
… model requires convection velocities and turbulent diffusion information that is supplied by solving the Reynolds-averaged parabolized Navier-Stokes equations with a <i>k</i> - ∊ turbulence model. The mean flow equations are solved by approximating the differential equations with a second …
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A Basic Three-Dimensional Turbulent Boundary Layer Experiment To Test Second-Moment Closure Models
In this work, a three-dimensional turbulent boundary layer experiment was set up with alternating stream-wise and span-wise pressure gradients. The pressure gradients are generated as a result of the test section wavy side wall shape. Each side had six sine waves with a trough to peak magnitude to …
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Moving Mesh Finite Element Method for Time Dependent Convection-Diffusion Problems
… true for singularly perturbed convection-diffusion problems. In the presence of vanishing molecular diffusivity, MM- FEM may not suffice. The numerical method may exhibit under-diffusive properties and other methods need to be integrated into the classic Galerkin formulation. We implement …
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Metallicity correlations in galaxies
… considers only stochastic metal injection and diffusion. The parameters extracted from fitting the data to this model are robust against observational effects and statistical choices. Correlation length, the characteristic turbulent diffusion length produced by the model, correlates with galaxy …
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Metallicity correlations in galaxies
… considers only stochastic metal injection and diffusion. The parameters extracted from fitting the data to this model are robust against observational effects and statistical choices. Correlation length, the characteristic turbulent diffusion length produced by the model, correlates with galaxy …
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