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 160 for “"Fluid and Plasma"”.
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STABILITY OF UPGOING AURORAL ION BEAMS AT 33 R(E) (PLASMA, MAGNETOSPHERE, WAVE-PARTICLE INTERACTIONS)
<p>Simultaneous upflowing hydrogen and oxygen beams of ionospheric origin are seen at altitudes near 3.3 R(,e) in the auroral zone by the DE-1 satellite. The beam observations indicate that, in addition to bulk acceleration, substantial heating in both hydrogen and oxygen has taken place either …
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Global Structure of the Nightside Proton Precipitation during Substorms using Simulations and Observations
… to pitch angle diffusion into the loss cone and ultimately auroral precipitation. The central plasma sheet typically provides a stretched enough magnetic field configuration to account for the nightside proton precipitation. During substorms, the outflow from the near earth reconnection line …
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Statistical study of oxygen+ transport from the cusp to the plasmasheet
… O+ in the magnetotail to determine where and when it is observed. The results show that the probability to observe O+ along the transport path is high even during nonstorm times, although, as expected, the highest probability is found during storm times. In addition to the outflow rate …
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The Effects of Weak Collisions on Nonlinear Plasma Kinetics
<p>Kinetic plasma behaviors have long been of interest to those studying space and laboratory plasmas. For instance, kinetic plasma instabilities are widely believed to be responsible for the generation of anomalous resistivity in reconnection layers, providing a possible mechanism for fast …
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Particle Dynamics in Inhomogeneous Flow at Moderate to High Reynolds Number
… resolves the smallest scales in the ambient flow and in the particle wake, and provides detailed microscale information on flow-particle interaction. We address the following sequence of problems. (a) Irrotational flow: We perform DNS of stationary and freely moving particles in straining flows. …
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Theory of Instability and Nonlinear Evolution of Self -Sustained Detonation Waves
Linear stability properties and nonlinear dynamics of self-sustained detonations is investigated by means of asymptotic analysis and numerical simulations. The normal-mode linear stability analysis is carried out for gaseous detonations propagating in cylindrical tubes. By comparison of the …
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Edge-Flames and Combustion at the Microscale
… quenching limits. The behavior of premixed and nonpremixed edge-flames in tune-periodic counterflows is modeled using a constant-density approximation and a single-step Arrhenius reaction rate. Results of numerical simulations indicate that the unsteady strain rate is generally a …
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Interaction Between a Spherical Particle and Wall -Bounded Flows at Finite Reynolds Number
… wall-normal locations, the buffer region and the channel center. Near-wall region mechanisms are observed consisting of such different events as bursting, sweep, and ejection, whereas channel center can be considered as nearly isotropic turbulence. We compare the computed forces with the …
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Boundary Integral Method for Interfacial Potential Flows in Unbounded Axi-Symmetric Domains
… with surface tension driven singularities at fluid interface in general. Within this study, different regimes are found and the conditions which define them are summarized with a phase diagram.
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Integrable Vortex Motions in Unbounded and Periodic Domains
… about the motions of the vortices themselves and the fact that the advected fluid is a continuous field, Thurston-Nielsen theory establishes a lower bound on the stretching in the advected field. Some of the vortex motions investigated produce exponential stretching in the flow field. This …
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The Spatial Structure of Turbulent Rayleigh-Benard Convection
… approximately 40% of the total kinetic energy, and this fraction was found to be approximately independent of the Rayleigh number. This leads to the conclusion that the wind of turbulence (U) scales with the velocity fluctuations (ufluct), U ∼ u fluct. The visualizations indicate that the …
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The Initial Value Problem for the Zakharov System
… application of techniques developed by Bourgain and Kenig, Ponce and Vega. The equivalent fixed point problem is solved via the contraction principle in the $X\sb{s,b}$ spaces introduced by Bourgain. A detailed analysis of the nonlinear terms, exploiting the arithmetical properties of the …
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Study of Plasma/flowing Liquid Metal Interactions
Interaction between an ion beam and flowing liquid Li has been studied in the FLIRE facility as a first step towards a plasma/flowing liquid metal interaction experiment. The retained fraction of implanted helium transport was quantified as a function of energy and velocity, yielding the expected …
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Thermoelectric Magnetohydrodynamic and Thermocapillary Driven Flows of Liquid Conductors in Magnetic Fields
Experiments show that TEMHD dominates the flow in SLiDE, consistent with the theory governing these flows. This is verified by series of qualitative experiments, as well as quantitative comparison with theoretical flow predictions. This constitutes the first direct observation of TEMHD driven flow …
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Research on Edge Ionization and Star Mode Discharge Physics in Inertial Electrostatic Confinement Neutron/proton Sources
… Star Mode incorporating the new physics understandings unearthed over the last eight years. Experimental benchmarking was successful at testing key model assumptions and validating the code simulation results. And finally, the PAIGS concept was studied and found to provide a modest (x1--2.5) …
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The Effects of Diabatic Heating on Storm Track Dynamics
… nonlinear primitive equation model with vertical and horizontal resolution adequate to capture shallow, short wavelength baroclinic waves. The model is forced by realistic orography and diabatic processes including radiative relaxation, surface heating and condensational heating. Time-mean …
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Propellant Surface Temperature and Plume Characteristics of Micro-Pulsed Plasma Thrusters
The micro-Pulsed Plasma Thruster is a device capable of supplying discrete impulses for propulsive maneuvering of small satellites. These devices suffer from low propellant utilization related to late-time propellant ablation, causing a drop in specific impulse and thruster efficiency. The exhaust …
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