Thesis (M.S.)--Ohio State University, 1978. / Includes bibliographical references (leaves 89-93). Available online via OhioLINK's ETD Center

Thesis (M.S.)--University of Wisconsin--Madison, 1966. / Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph.D.)(Metallurgical Engineering)--University of Pretoria, 2006. / Includes summary. Includes bibliographical references. Available on the Internet via the World Wide Web.

No description available.

The pipeline network of North America is thousands of kilometer long and is ever increasing. To ensure the safety of every individual whose lives are affected by this network, the inspection of the pipelines are mandatory. With the steady progress and downsizing of robotic components, the wireless inspection of smaller pipelines is now a possibility and is the principal driver of this research. Mainly, the scope of this project is to explore the feasibility of the fabrication of a robot to inspect pipes of diameter of six to eight inches. Various design possibilities and the inherent problems of small confined environments inspections are investigated. The parameters for the fewest number of collisions for the design of a pipe robot is presented and various pipe scenarios are simulated. Finally, a prototype is fabricated and recommendations are suggested for future subsequent iterations of the robot.

The effect of turbulence damping polymer additive on the fluid flow structure near the wall region of a circular pipe was made visible using real-time laser holographic interferometry. The interference fringes were recorded by high-speed motion photography. The gross flow behaviour of dilute solutions of Polyox WSR 301 in distilled water was studied in a 2.63 cm pipe. It was observed that (i) The onset of drag reduction occurred at a critical value of wall shear stress and Reynolds number. (ii) The fluid property parameter, δ, which governs the drag reduction capacity of the solution, had a power-law dependence on polymer concentration given by [23] [ Formula omitted ] Motion pictures of real-time holographic fringe displays for pure solvent and polymer solution were appraised qualitatively. Under similar flow conditions turbulent eddies in drag-reducing flow were observed (i) to show less small scale structure than those in the pure solvent, and (ii) to burst from the wall region into the bulk flow with a lower frequency. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

Glass Reinforced Polymer pipes, commonly used in water transport applications, are prone to long term weepage. Weepage is defined as the transfer of fluid through the pipe and is considered a functional failure. An experimental investigation of weepage in multi-layered GRP pipes was carried out in two parts aiming to understand the phenomenon to help enhance the weepage resistance of manufactured pipes. First, liner surface profilometry investigation was carried out to identify microscopic features that might serve in initiating weepage. Second, MRI and x-ray tomography and SEM imaging of pipe samples aged with water and dye penetrant was carried out to capture weepage development through the pipe thickness. Diffusion through liner fiber/resin interface, propagation in the direction of poorly wetted hoop fibers and transverse cracks were found to be the likely causes of accelerating weepage in the samples. Fiber rich zones in the liner were considered weak spots that water can use for fast penetration of the liner. Finally, polyester netting used to hold core layer was found to help in water accumulation and transport through the pipe increasing the chances of failure.

Mantle derived rock and mineral fragments from the Koffiefontein Kimberlite Pipe have been studied in the form of xenoliths, megacrysts, concentrate minerals and inclusions in diamonds. Mantle derived xenoliths are unusuaLly scarce. The predominant xenoliths are pyroxenites. Peridotites are rare and eclogites are very rare. The pyroxenites have been assigned to five categories. In general, they show a clear metamorphic textural history with widespread evidence of exsolution, polygonisation and deformation. Some of these pyroxenites are interpreted to represent the crystallisation products of basaltic magma at depth. Some have been metasomatised. The pyroxene chemistries suggest that more than one pyroxenite body has been sampled. The peridotites are very similar to the common peridotites of N. Lesotho and are thought to represent depleted mantle. The Koffiefontein diamonds contain both eclogitic and peridotitic inclusions. The inclusions show evidence for lack of equilibration, and one appears to link tog~ther the two parageneses mentioned above. The presence of (MgFe)O as an inclusion is reported. The megacrysts studied consisted only of garnets, and a few pyroxenes. They are interpreted to have crystallised from a magma which cooled slowly and was relatively deficient in Tio2 to account for the scarcity of ilmenite. The heavy mineral concentrate contained garnet, orthopyroxene, opaque minerals and clinopyroxene in order of abundance. The opaque minerals were chromite and ilmenite. The chemical compositions of most of the concentrate grains do not match the mineral compositions found in xenolith s, or megacrysts. A small number of concentrate grains have compositions ma tched by the diamond inclusions. Attempts to a pply geothe r mobarometry to the pyroxenites and to the diamond inclusions gave conflicting results which areascribe d to lack of equilibration between co-existing mineral phases and/or within individual mineral grains. The Koffiefontein xenolith suite is unusual for the relative abundance of pyroxenite and the scarcity of peridotite. The concentrate is unusual for the relative abundance of orthopyroxene particularly and of chromi te.

In this research, we quantify the parametric effects (number of turns, inclination angle, and filling ratio) on different designs of closed loop oscillating heat pipes (CLOHPs). Experiments were conducted on a CLOHP, which is made of copper tube with 1.65-mm inner diameter. Tubes are heated and cooled by constant temperature in wind tunnels, and n-pentane was used as the working fluid. The numbers of turns used were 5, 7, and 9. The effects of number of turns were investigated in order to prove the less gravity effect when the number of turns increases. Inclination angles used were 75, 82.5, and 90-degree. Inclination angle effects were investigated to verify that inclination angle decreases the affects of gravitational force. The tubes were charged to 0 and to 70 percent of total volume of tubes with n-pentane to demonstrate optimum heat transfer between condenser and evaporation sections. The importance of this work is in presenting design parameters to obtain lower energy consumption in comparison to previous known designs. Results indicate that 9 turns, 90-degree inclination angle, and charging 70 percent n-pentane of tubes were the most effective design parameters.

No description available.