Chemical and Biomolecular Engineering - Theses

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    The sorption of ammonia on brown coal
    Oussa, Awad Rizk ( 1978)
    This thesis is a report of an investigation carried out by the author between 1st April 1969 to 31st October 1973 on a full time basis and from 1st December 1975 to 31st July 1978 on a part time basis. The research project was conducted by the author in the Department of Chemical Engineering, University of Melbourne, and on the premises of Australian Char Pty. Ltd., Morwell. The project was based on the premise that useful information on the brown coal-ammonia system can be obtained from sorption isotherms. The author designed and assembled the apparatus with this in mind, and developed a method of obtaining a self-consistent and meaningful interpretation of the sorption isotherms. Thermodynamic data for the ammonia sorption process was derived and used to develop a preliminary model for the ammonia-brown coal system. No separate literature review has been presented in the thesis, though frequent reference to the literature has been made in the discussions in each chapter. Finally, the experimental details have been included in the appendices at the end of the thesis.
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    The effect of return bends on the heat transfer from an internally flowing turbulent air stream in smooth tubes
    Batterham, Robin John ( 1968)
    The aim of the project was to investigate the effect of an 180° bend on the heat transfer from an internally flowing turbulent air stream. The presence of a bend was shown to increase the local heat transfer rate in the bend and in the upstream and downstream regions of the bend. (For complete summary open document)
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    Gas bubble behaviour in liquid systems
    La Nauze, Robert David ( 1972)
    The formation phenomena of carbon-dioxide bubbling into water through 1/16”, 1/8” and 3/16” diameter orifices was recorded photographically for gas flow rates between 1 and 30 cm3/s for system pressures up to 300 psig. It was shown that for the same volumetric flow rate, determined at system conditions, increased system pressure causes smaller but more frequent bubbles to be formed. Bubbling at high mass flow rates is characterised by a large degree of interaction and coalescence near the orifice. A detailed analysis of mathematical models of the formation process was undertaken. This study highlighted fundamental inadequacies in an existing two stage growth model. A more realistic model of formation was developed which included terms for the inertia of the liquid surrounding the bubble and the gas momentum. Within the constraints of a single bubble analysis, the model shows good agreement with the experimental results for volume and flow rate and predicts the correct trend for frequency and pressure fluctuations across the orifice. The influence of liquid circulation on bubble growth at high system pressure is discussed and several theoretical approaches to the problem have been outlined.