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 328 for “"Plumes"”.
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Dynamics of mantle plumes
Mantle plumes are a link between different scales in the Earth’s mantle: They are an important part of large-scale mantle convection, transporting material and heat from the core-mantle boundary to the surface, but also affect processes on a smaller scale, such as melt generation and transport and …
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Eddy dynamics of ß plumes
… in the interior. The effect of topography on ß-plumes was also examined by placing a Gaussian bump in the forcing region. Despite the fact that the mean flow is weak in the deep ocean interior, it was found that the nonlinearity and instabilities are still important for realistic parameter and …
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Experiments on Stratified Multiphase Plumes
Buoyant plumes are flows of great interest to engineers and geologists alike with applications varying from chemical engineering processes to explosive volcanic eruption columns. Single-phase plumes have been well studied and the flow’s behaviour is generally well understood, however many examples …
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Eddy dynamics of [Beta] plumes
Thesis (S.M.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2003.
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Modelling of satellite control thruster plumes
… as a consequence of the impingement of thruster plumes with spacecraft surfaces. Such thrusters are normally fired for attitude control. The prediction of such effects must be undertaken at the design stage of the vehicle.<br/>In this study, the modelling of such plumes was undertaken. The …
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Turbulent Line Plumes and Filling Boxes
Turbulent line plumes have been studied for over half a century, yet key questions regarding their behaviour remain unanswered. In this thesis, we use a combination of simplified theoretical modelling, flow visualisations, and experimental measurements to address the following questions. First, …
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Lagrangian computations of radiating fire plumes
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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The chemistry of iron in hydrothermal plumes
… for<br/>dissolved Fe export via hydrothermal plumes to the deep-ocean.<br/>To investigate the fate of hydrothemally sourced Fe, samples were collected from hightemperature<br/>hydrothermal vent-field plumes at 9°N on the East Pacific Rise and at 5°S on<br/>the Mid-Atlantic Ridge. The samples …
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Hydrothermal plumes and processes in Indian Ocean
… cycling of the whole ocean through hydrothermal plumes is comparable to the mixing time of the oceans (few thousand years). Hence, understanding hydrothermal plume processes is crucial if their impact on the global geochemical cycles of elements is to be assessed. One of the most important …
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Modelling the atmospheric chemistry of volcanic plumes
… atmosphere. This investigation considers model plumes from the point of emission up to a day’s travel from the vent and is able to reproduce observed phenomena of BrO formation and O3 depletion within volcanic plumes. The model plume influences several atmospheric chemistry systems, including …
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Hybrid-PIC modeling of Hall thruster plumes
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
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Turbulence in Multiphase Models for Aeration Bubble Plumes
"A new theoretical formulation for bubble plumes is presented, which serves for the definition of a sophisticated three-dimensional (3D) numerical model. The theoretical/numerical model includes a treatment of turbulence via a k - epsilon model and a Large-Eddy Simulation (LES) approach. It is …
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Modeling buoyant droplet plumes in a stratified environment
… equations. The particular nature of the class of plumes under investigation (droplet plumes where droplet buoyancy decreases with height due to dissolution, and dissolved C02 increases fluid density), however, is characterized by regions of upward flow, driven by the buoyant droplets, and downward …
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Experimental studies of two-phase negatively buoyant plumes
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Wavefront Healing and Tomographic Resolution of Mantle Plumes
To investigate seismic resolution of deep mantle plumes as well as the robustness of the anti-correlation between bulk sound speed and S wave speed imaged in the lowermost mantle, we use a Spectral Element Method (SEM) to simulate global seismic wave propagation in 3-D wavespeed models and measure …
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Emissions and Chemistry of Reactive Nitrogen in Wildfire Plumes
… nitrogen emissions and chemistry within wildfire plumes sampled during the Western Wildfire Experiment for Cloud chemistry, Aerosol absorption and Nitrogen (WE-CAN) aircraft campaign with unprecedented comprehensive measurements of over 250 wildfire plume transects. In this dissertation, I …
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Electric charge within volcanic plumes on Earth and Io
… carried out into the electrification of volcanic plumes. At Sakurajima volcano, Japan, ground-level perturbations of the atmospheric electric potential gradient generated by particulate plumes were recorded. Simultaneous measurements, made at up to five sites around the volcano, are shown to be …
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The use of swirl to clean nuclear rocket plumes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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A computer model for circular and linear bubble plumes
The purposes of this research were to implement the circular plume model developed by Wuest et al. (1992) and to develop and verify a linear plume model based on the circular model. The linear model developed is the first that models a bubble plume generated by a linear source in thermally …
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