LD2668 .T4 1941 P51 / Master of Science

M.Ing. / Please refer to full text to view abstract

Thesis (Ph. D.)--School of Computing and Engineering and Dept. of Mathematics and Statistics. University of Missouri--Kansas City, 2005. / "A dissertation in engineering and mathematics." Advisor: Bryan R. Becker. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed March 12, 2007. Includes bibliographical references (leaves 216-220). Online version of the print edition.

Thesis (MScIng)--University of Stellenbosch, 2007. / Bibliography. Also available via the Internet.

M.Tech. (Mechanical Engineering Technology) / This project researched the feasibility of using an existing mitre bend on the main condenser crossover ducting as an on-line flow measuring system. This flow measurement is based on the principle of an elbow type of flow meter. There are no detailed published standards or specifications available for Elbow flow meters. The knowledge of the cooling water flow rate through the individual condensers would allow turbine heat rate calculations to be performed. In addition condenser, cooling tower and cooling water pump performance can be evaluated. An on-line system would also highlight potential problems sooner, thus eliminating costly unplanned shutdowns. The majority of the straight length of condenser cooling water piping is under concrete, thus making access very difficult. The exposed condenser piping geometry is not ideal, with very distorted flow profiles expected, due to bends, valves, reducers, etc. Conventional flow measuring systems can therefore not be used, as ideal flow conditions (profiles) before and after the measuring instrument are required to er.sure the specified accuracy. The mitre bend being part of the piping geometry does not introduce additional head loss to the system and coupled to the low cost factor of an elbow type meter was the principal reason for the choice of this type of measuring system. Part of the innovative aspect of this research is that a conventional elbow is not used but an existing mitre bend is utilised as the fundamental flow measuring device. The Elbow/Bend differential pressure method to measure the condenser cooling water flow rate was investigated in the Flow laboratory at Eskom (Technology Research and Investigations). A geometrically similar mitre bend was purchased and installed onto the 700 mm NB pipeline at the laboratory. The diametrical differential pressure was measured at the 22.5° and 45°axes of the 0.8 D mitre bend. The differential pressure was related to the fluid flow rate, and a calibration constant C was determined. The velocity profiles under the test conditions were verified. A Computational Fluid Dynamics model of the laboratory mitre bend was also produced. The model provided a clearer understanding of the internal flow patterns and the exact pressures on the inside and outside of the bend. The tests that were conducted in the laboratory confirmed the suitability of converting the main condenser crossover ducting mitre bends into an on-line cooling water flow measuring systems.

A packed condenser and the auxiliary equipment were designed, built and tested for the condensation of steam in direct contact with Aroclor 1242 and 1248, which are commercial heat transfer agents and are immiscible with water. The co-current flow of steam and liquid, through a four inch inside diameter column packed with three-eighth inch ceramic Raschig rings, was studied. The packing heights used in the condensation of steam were estimated from the liquid temperature profile in the column. The heights of the transfer units for condensation and the average volumetric overall heat transfer coefficients were calculated. The height of the transfer unit for condensation was found to be affected largely by the mean viscosity and the flow rate of the liquid. Two empirical equations have been developed to describe the results of this study. HCU = F ( μ ) (n) where n = 1. 10 for Aroclor 1242 and n = 1. 16 for Aroclor 1248 is mean viscosity of the Aroclor in centipoise. For Aroclor 1242, F= 0.0535 + 8.90 x l0⁻⁶ L when L ≤ 2290 and F =-0. 0737 + 6. 44 x 10⁻⁵ L when L > 2290. For Aroclor 1248, F = 0. 02765 + 1. 244 x 10⁻⁵ L. L is superficial mass velocity of the Aroclor in lb /hr. ft² / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

Thesis (M.S.)--Mississippi State University. Department of Mechanical Engineering. / Title from title screen. Includes bibliographical references.

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Thesis (M.S.)--Rochester Institute of Technology, 1995. / Typescript. Bibliography: leaf 54.