Browsing Department of Mechanical and Materials Engineering Graduate Theses by Title
Now showing items 191-210 of 355
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Large-Eddy and Wall-Modeled Simulations of Turbulent Flow Over Two-dimensional River Dunes
The Large-Eddy Simulation (LES) technique is only applicable to wall-bounded flows at moderate Reynolds numbers due to its computational cost. Wall-layer models are designed to extend the LES concept to engineering flows ... -
Large-eddy simulation and modelling of dissolved oxygen transport and depletion in water bodies
(2012-07-04)In the present doctoral work we have developed and tested a model for dissolved oxygen (DO) transfer from water to underlying flat and cohesive sediment beds populated with DO-absorbing bacteria. The model couples Large-Eddy ... -
Large-eddy simulation of unidirectional turbulent flow over dunes
(2013-05-28)We performed large eddy simulation of the flow over a series of two- and three-dimensional dune geometries at laboratory scale using the Lagrangian dynamic eddy-viscosity subgrid-scale model. First, we studied the flow ... -
Large-Eddy Simulations of Accelerating Boundary Layer Flows Over Rough Surfaces
(2011-10-17)Large-eddy simulations are carried out to study the combined effects of roughness and favourable pressure gradient in boundary layer flows, where the high acceleration (on smooth walls) may cause flow reversion to ... -
Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces
(2015-05-13)Large-eddy simulations were carried out to investigate the flow dynamics of wall jets over smooth and rough surfaces. Results were validated against data in the literature. A sand-grain roughness model is used, based on ... -
Laser Welding of Alumina Ceramic Substrates with Two Fixed Beams
(2013-04-30)Laser welding was investigated as a potential joining technology for alumina ceramic substrates. The objective of this study was to develop a method to preheat the ceramic using a single defocused laser beam prior to ... -
Laser Welding of Nylon Tubes to Plates Using Conical Mirrors
(2009-08-17)Laser transmission welding of polymers is a relatively new joining technique. It is based on the fact that the majority of thermoplastics are transparent to infrared radiation. A laser beam passes through the transparent ... -
Lattice Strain and Texture Evolution During Room-Temperature Deformation in Zircaloy-2
(2008-01-14)Zircaloy-2 and its sister alloy, Zircaloy-4, have extensive applications in the nuclear industry as core components in heavy water reactors and fuel cladding in both heavy and light water reactors. Intergranular stresses ... -
Lattice Strain and Texture of Plastically Deformed Zircaloy-2 at 77K
(2009-12-07)Zircaloy-2 is used extensively in the nuclear industry as a structural material for the reactor core in both light and heavy water reactors. The intergranular strains and texture greatly affect the mechanical properties ... -
Lattice Strain Development in Inconel-690 under Bi-axial Compression and Tension
(2010-09-02)Nuclear reactor steam generator tubes, manufactured from Nickel alloys such as Inconel 690 (INC690), are potentially susceptible to failure by Stress Corrosion Cracking where crack initiation may be exacerbated by internal ... -
Lattice Strain Response of Zr-2 During Biaxial Deformation
(2014-01-13)Pseudo-plane strain compression tests are carried out on rolled plate Zircaloy-2 using different combinations of loaded and constrained sample directions relative to the plate principal directions. Lattice strains are ... -
Low Carbon Fuels in the Cement Industry: Biogenic Carbon Determination Methods and Quantification of Dioxins and Furans
(2014-07-31)This thesis examined the introduction and potential issues associated with the introduction of low carbon fuel (LCF) within the context of a project currently in progress at the Lafarge Bath plant. An analysis considering ... -
Low Temperature Cleavage Fracture of Microalloyed Bainitic Plate Steels
(2009-08-07)Low temperature cleavage fracture behaviour was investigated using four experimental microalloyed bainitic plate steels. The four plate samples were produced by different thermomechanical processing (TMP) schedules and had ... -
Machine Vision Based Inspection: Case Studies on 2D Illumination Techniques and 3D Depth Sensors
(2012-03-01)This paper investigates two distinct, but related, topics in machine vision. The first is the effect of lighting on the performance of a 2D vision-based inspection system. The lighting component of machine vision has often ... -
Manufacture of vertical walls with asymmetric incremental sheet forming
Single point incremental forming (SPIF) is a dieless sheet metal forming technique that can manufacture customised sheet metal components in a cost-effective manner. However, the process is still in the developmental phase ... -
Manufacturing Constraints for Topology Optimization: A Particle Diffusion Based Methodology
With the need for improved performance becoming more apparent in the engineering workplace, numerical tools like design optimization and topology optimization have been turned to in order to generate new unconventional ... -
Matuto, Magbasa, Maglaro: Learning to Read Braille Through Play
In 2016, Digital Learning for Development and All Children Reading released a “Grand Challenge for Development” urging researchers to explore the barriers that children with sensory disabilities in the Philippines face ... -
Measurement and Modelling of Vibration Characteristics of a Mining Skip During Unloading
(2014-12-03)Arc gate skips can carry larger payloads compared to other designs due to the superior safety of the arc gate design, however these skips experience large amplitude vertical oscillations during unloading. Data were collected ... -
Measurement of Pubic Symphysis Width in Different Birthing Positions Using Ultrasound
Studies have shown that certain postures, such as squatting and standing, may facilitate labour and birth and may be used by some practitioners. However, a rigorous biomechanical understanding of how different positions ... -
Measuring Cognitive Load in a Clinical Setting: Medical Learning and Practice
Cognitive load theory is of particular relevance to the learning and practice of medicine, where task demands require a complex interplay of working memory, emotion, and stress. To better understand the role of cognitive ...