Steam turbines are an integral part of power generating systems. The durability and reliability of steam turbines depend heavily on the integrity of their blades. In the last stages of a steam turbine, steam condenses and produces droplets. The effect of these droplets on the ef…
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A finite volume method for computer simulations of fluids obeying the equation of Bhatnagar, Gross, and Krook (BGK) for ideal fluids is described. The theory is extended to deal with non-ideal fluids. An approach for modeling a van der Waal's fluid is developed and the results o…
Experiments on nonlinear wave-particle interactions using a traveling wave tube (TWT) are described. There, one or more waves modify the motions of energetic beam particles, and these beam perturbations affect the wave evolution. At large amplitudes, mode-coupling is observed an…
Vortex-induced vibration (VIV) of elastically supported cylinders in cross-flow is studied experimentally for cylinder mass ratios (average cylinder density/fluid density), 2.1 < m* < 72. For small mass ratios below 10, a new VIV mode is discovered which does not involve a lock-…
This thesis addresses three problems in seismology and volcanology by applying fluid dynamical theories that have been developed for engineering applications. Fault zones are proposed to operate analogously to journal bearings. A quantitative assessment of the physical regimes i…
Incompressible, viscous, two-dimensional unsteady flows over bluff bodies are simulated via the use of vortex methods. The vorticity domain is discretized into a number of Lagrangian point vortices. The vorticity transport equation is split into convection and diffusion parts, a…
Future space systems such as Space Station Freedom, and space defense systems will require storage of cryogenic fluids in a low-gravity environment for extended periods of time. Heat leaks to the containment vessel lead to an increase in the temperature and pressure of the fluid…
An experimental study was undertaken to elucidate the mixing enhancement and noise reduction in a jet caused by tabs, simple protrusions into the flow, placed at the nozzle exit. Far-field acoustic spectra of underexpanded jets showed the elimination of screech and a decrease in…
Since probe theory was developed, the problem of current collection by a charged spherically or cylindrically symmetric body has been investigated by a number of authors (e.g. Parker and Murphy, 1967; Linson, 1969; Laframboise and Rubinstein, 1976). The purpose of this paper is …
The fluid flow patterns in a paper-machine headbox have a strong influence on the quality of the paper produced by the machine. Due to increasing demand for high quality paper there is a need to investigate the details of the fluid flow in the paper machine headbox. The objectiv…
Quantifying and controlling the radiative power losses from impurities in the tokamak fusion plasma is crucial for obtaining ignition conditions. In the present work, therefore, losses from impurities have been measured in different operating regimes of the Alcator C-Mod Tokamak…
Over the past thirty years, extensive research has been conducted with the objective of reducing wind damage to structures. Wind tunnel simulations of wind loads have been the major source of building codes. However, a simple comparison of pressure coefficients measured in wind …
This work introduces a new pump, called the spiral pump, which targets the surface micromachining technology. We demonstrate the possibility of realizing the spiral pump geometry in standard surface micromachining, lay out the theoretical foundation for its operation, and conduc…
Investigations have been made of the aerodynamic effects of in-service damage on the performance of axial turbine blades. Two aspects of blade damage were considered: surface roughening and trailing edge damage. The work is related to gas turbine engine health monitoring. Correl…
Numerical and experimental investigations of tidal current energy extraction have been conducted in this study. A laboratory-scale water flume was simulated using commercial computational fluid dynamics (CFD) code FLUENT. In the numerical model, the tidal current turbine is repr…
The effect of insoluble surfactant on the breakup of a fluid jet surrounded by another viscous fluid at low Reynolds number is studied both theoretically and experimentally. Equations governing the evolution of the interface and surfactant concentration are derived using a long …
Accretion, the process by which matter collects into a central object, is ubiquitous and often dynamically important for astrophysical objects on the scale of compact object disks (∼ 1010 cm) up to that of galactic clusters (∼ 1024 cm). In order for matter to accrete, it must lo…
Several active flow control, as well as passive flow control, schemes were applied to a modified Glauert II "laminar" airfoil section. Zero mass-flux oscillatory suction and blowing and net mass-flux steady suction, or steady blowing were applied through a segmented spanwise slo…
In the present thesis work a theoretical transport model is suggested to study the anomalous transport of plasma particles and energy across the axisymmetric equilibrium toroidal magnetic flux surfaces in tokamaks. The model suggests a linear combination of two transport mechani…