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 521 for “"buoyancy"”.
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Variable buoyancy system metric
… tasks. Systems used on the vehicle to alter buoyancy, or variable buoyancy (VB) systems, have seen only minor improvements during the same time period. Though current VB systems are extremely robust, their lack of performance has become a hinderance to the advancement of vehicle capabilities. …
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Variable buoyancy system metric
… tasks. Systems used on the vehicle to alter buoyancy, or variable buoyancy (VB) systems, have seen only minor improvements during the same time period. Though current VB systems are extremely robust, their lack of performance has become a hinderance to the advancement of vehicle capabilities. …
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Propulsion via buoyancy driven boundary layer
Heating a sloped surface generates a well-studied boundary layer flow, but the resulting surface forces have never been studied in propulsion applications. We built a triangular wedge to test this effect by mounting a resistive heating pad to one of its conducting sloped surfaces. We submerge the …
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Buoyancy-driven circulation in the Red Sea
This thesis explores the buoyancy-driven circulation in the Red Sea, using a combination of observations, as well as numerical modeling and analytical method. The first part of the thesis investigates the formation mechanism and spreading of Red Sea Overflow Water (RSOW) in the Red Sea. The …
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The role of eddies in buoyancy flux
… predictions, derived from analysis of buoyancy flux, for the number of eddies expected to form.
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Buoyancy-driven circulation in the Red Sea
This thesis explores the buoyancy-driven circulation in the Red Sea, using a combination of observations, as well as numerical modeling and analytical method. The first part of the thesis investigates the formation mechanism and spreading of Red Sea Overflow Water (RSOW) in the Red Sea. The …
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Modeling buoyancy-driven airflow in ventilation shafts
… in outdoor air using non-mechanical forces. Buoyancy-driven systems are common in naturally ventilated commercial buildings because of their reliable performance in multi-story buildings. Such systems rely on atria or ventilation shafts to provide a pathway for air to rise through the …
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Instigating buoyancy driven convection to improve membrane distillation performance
… differences in local feed density can instigate buoyancy driven convection in the feed flow and mitigate polarization. We also explore whether we can strengthen this convection by actively heating the feed channel in a direct contact membrane distillation (DCMD) system. For that purpose, we …
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Shear Effects on Buoyancy-Generated Turbulence and Salt Fingers
Linear theory and laboratory experiments on a finger-favorable gravity current are applied to study turbulence in a salt finger favorable flow. The theory reproduces well previous observations for unsheared flow, and it predicts that heat can be transported more efficiently than salt, even in salt …
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Computational simulation of buoyancy-driven flows using vortex methods
… new vortex method for simulating two-dimensional buoyancy-driven flows is presented. This Lagrangian method utilizes a discrete representation of the known density field along with the vorticity transport equation and Boussinesq approximation to yield the baroclinically-generated vorticity field, …
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The influence of buoyancy upon near wake pollutant dispersal
… trapping within wakes, and how pollutant buoyancy might change this, is crucial to understand human exposure to the many sources of pollutant present within cities. This thesis focuses upon the interaction between a buoyant pollutant and two wake producing objects: a backward facing step, …
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Turbulent entrainment in flows induced by distributed buoyancy sources
Free shear and wall-bounded buoyancy-driven turbulent flows occur in both natural environments and industrial situations. In this thesis, to better understand the entrainment process within these flows, experiments and theory have been used to investigate point and distributed buoyancy sources and, …
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Biomechanics of extravehicular activity and its neutral buoyancy simulation
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1987
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Effects of environmental shear and buoyancy on simulated supercell interactions
This study examines the role that buoyancy and vertical wind shear play in modulating the relationship between storm interactions and storm severity. Using an idealized numerical model, 240 supercell interactions are simulated under systematically varied amounts of buoyancy and vertical wind shear. …
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Study of Buoyancy -Induced Flows in a Prototypical CVD Reactor
Next, an understanding the influence of the transient operating conditions in the prototypical CVD reactor was sought. Film growth rate shows time varying pattern due to the transient operating conditions. But it oscillates between two end steady states. Thus, it is observed that film growth rate …
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Buoyancy-thermocapillary convection of volatile fluids in confined and sealed geometries
… to a combination of thermocapillary stresses and buoyancy is a classic problem of fluid mechanics. It has attracted increasing attentions recently due to its relevance for two-phase cooling. Many of the modern thermal management technologies exploit the large latent heats associated with phase …
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The Effect of Buoyancy Forces on The Melting and Freezing Process
Made available in DSpace on 2014-12-08T23:18:16Z (GMT). No. of bitstreams: 1 6607715.pdf: 6805913 bytes, checksum: 3070593242f43738866b38c727dd3c71 (MD5) Previous issue date: 1966
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Ventilation, stratification and flow instability driven by vertically distributed buoyancy sources
… on flows driven by vertically distributed buoyancy sources. Following a storyline, the three serial problems have inherent connections. In the first project, a theoretical model is developed for the steady multi-layered flow induced by a plane vertically distributed buoyancy source …
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Effects of buoyancy source composition on multiphase plume behavior in stratification
… The constituent phase composition of the initial buoyancy flux can be dense brine, particles, or a mixture of the two in a prescribed ratio. The resulting trapping heights and peeling depths are recorded by visual acquisition and from dye fluorescence measurements. Also, the radial concentration …
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