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.
Results
Showing 1 to 20 of 52 for “"Momentum Transport"”.
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Turbulent Angular Momentum Transport in Weakly-Ionized Accretion Disks
… onto a central object. Since the angular momentum of the infalling material is conserved, a disk naturally forms as a repository of angular momentum. Dissipation removes energy and angular momentum from the system and allows the disk to accrete. It is the energy lost in this process and …
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Momentum transport due to a squall line system over the tropical oceans
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.
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Velocity-ion temperature gradient driven modes and angular momentum transport in magnetically confined plasmas
… thesis, we consider the phenomenon of angular momentum transport in magnetically confined plasmas. Relevant experiments and theoretical developments are presented in order to motivate the derivation of a modified version of the three-field nonlinear Hamaguchi-Horton equations. The equations are …
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A theory of the mesoscale organization of moist convection and the associated vertical momentum transport
A parameterization of cumulus momentum transport is proposed. An important feature of the parameterization is the inclusion of the perturbation pressure-gradient force induced by interactions between the updraft and the environmental wind. The orientation, aspect ratio, phase speed and size of the …
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Momentum transport, radial electric field, and ion thermal energy confinement in very high temperature plasmas
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Solid Oxide Fuel Cell Modeling at the Cell Scale - Focusing on Species, Heat, Charge and Momentum Transport as well as the Reaction Kinetics and Effects
… equations covering heat, gas-phase species, momentum, ion and electron transport are implemented and coupled to kinetics describing internal reforming and electrochemical reactions. Both ordinary and Knudsen diffusion are considered for the gas-phase species transport. For the heat transport …
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Theoretical study of ion toroidal rotation in the presence of lower hybrid current drive in a tokamak
… the rotation change. The toroidal angular momentum injected by the lower hybrid waves initiates acceleration in the the counter-current direction. The parallel and perpendicular components of the toroidal angular momentum are transferred from the waves to ions through electrons via two …
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The L- to H-mode transition and momentum confinement in Alcator C-Mod plasmas
… was measured during the L- to H-mode transition. Momentum transport was measured in both Ohmic and ICRF-heated discharges, which produced EDA and ELM-free H-modes. The momentum transport was modeled by a simplified diffusion model, in which momentum diffusivity was substantially higher than …
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Local Numerical Models of Turbulent Accretion Flows
… the most promising candidate for driving angular momentum transport in accretion disks. This work provides a comprehensive study of MHD turbulent accretion flow using shearing box simulations.
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The effects of double-diffusion on a baroclinic vortex
… double-diffusive buoyancy flux. The increased momentum transport across a double-diffusive interface, however, acts to oppose the action of the buoyancy flux. Turbulent double-diffusive Ekman layers could be a means of redistributing momentum. A model of an intrusion was made by injecting salt …
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Entanglement and hall viscosity
… conductivity. We develop an understanding of momentum transport due to Hall viscosity in analogy to charge transport under Hall conductivity. We apply our momentum transport argument to continuum and lattice models of the quantum Hall effect. We also leverage this insight to reveal a …
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Nonlinear gyrokinetic simulations of intrinsic rotation in up-down asymmetric tokamaks
… and rotation shear can suppress turbulent energy transport as well as allow violation of the Troyon [beta] limit. However, using external neutral beams to inject toroidal momentum, as is done in many current experiments, would require a prohibitive amount of energy in larger, reactor-sized …
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Liquid metal brushes for homopolar devices
… For a sufficiently strong field, the azimuthal momentum transport by the secondary flow can be neglected. This assumption reduces the problem for a primary azimuthal velocity to a fully developed magnetohydrodynamic (MHD) duct flow problem with a moving wall and two free surfaces.
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Hydrodynamic and Magnetohydrodynamic Convection in Accretion Disks
… of the two processes can enhance angular momentum transport, at least in the optically thick outburst stage of dwarf novae. In this thesis we seek to isolate and understand the most generic features of disk convection, and so undertake its study in both hydrodynamical and …
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Rotation generation and transport in tokamak plasmas
… is a factor important for plasma stability and transport, but it is still a fairly poorly understood area of physics. This thesis focuses on three aspects of rotation: momentum transport, Ohmic rotation reversals, and LHCD induced rotation. Momentum transport is approached in a semi-empirical …
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Paleomagnetic Investigation of Enstatite Chondrite Chondrules: Implications for the Solar Nebula
… governed the highly efficient mass and angular momentum transport systems. Paleomagnetic measurements of chondrites have constrained the intensity of the nebular field between ∼3-7 AU. Previous work on two dusty olivine chondrules from high iron enstatite chondrites with variable kamacite grain …
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Magnetized models for the formation of the moon
… (1) Earth and lunar masses, (2) the angular momentum of the Earth--Moon system, and (3) Earth and lunar isotopic ratios. Geochemical analyses of lunar samples reveal that the Earth and Moon are surprisingly similar in isotopic ratios, e.g., the lunar oxygen isotope ratio \delta17O/\delta18O …
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Modeling enhanced impurity sputtering due to rf sheaths in front of ICRH actuators
… respect to the material surface, solving for the momentum transport of both the ions and the impurities. The sputtering model of the impurities coming off from the wall is based on lookup tables obtained from the plasma-material interaction code Fractal-Tridyn. This study analyzes a range of …
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Dynamical evolution of rotating globular clusters with embedded black holes
… in energy and z-component of angular momentum, Fokker Planck numerical methods. The interplay between velocity diffusion due to relaxation and black hole star accretion is followed together with cluster rotation. The results show how angular momentum transport andstar accretion support …
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The evolution of vortices in a turbulent boundary layer
… shown to provide a physical basis for enhanced momentum transport and observed inclinations of vorticity. In addition, collections of vortices are shown to provide an inviscid basis for mean velocity gradients and random-appearing, yet well correlated, velocity fluctuations.
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