Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"flow visualisation"”.
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Flow visualisation and fundamental aspects of two-dimensional turbulent plumes
… fluid dynamics problems, for example, indoor airflows. Specifically, this thesis focuses on the turbulent plumes which develop above sources which directly supply buoyancy, but zero momentum, to the fluid. Sources of this type are particularly relevant to modelling the convective flows driven by …
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Infrared Thermography Techniques for Flow Visualisation and Heat Transfer Coefficient Measurement
… methods and identify routes for optimisations. Flow visualisation with IR uses the change in surface temperature that occurs at a change in boundary layer state due to changes in heat transfer coefficient and recovery temperature. A one-dimensional conduction model is developed to analyse the …
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Flow Imaging of the Fluid Mechanics of Multilayer Slide Coating. Flow visualisation of layers formation in a 3-layers slide coating die, measurement of their thicknesses and interfacial and free surface flow instabilities
… the physical properties of the coating fluids), flow instabilities may arise at the interfaces between the layers and on the top layer. These instabilities ruin the application of the final multi-layered coating and must be avoided. This research addresses this coating flow situation and seeks to …
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The development of passive flow control vortices
Surface flow visualisation and Particle Image Velocimetry (PIV) were used to investigate the flow-field of sub-boundary layer vane vortex generators (VVGs) and steady jet vortex generators (SJVGs) in a separated flow at 20m/s. The vortex generators were mounted on a 2D bump which was situated on …
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Interaction between turbulent flow and saturated porous media
In this thesis, the interaction between turbulent flow and saturated porous media has been investigated using computational fluid dynamics (CFD) simulations, flow visualisation experiments and laser Doppler velocimetry (LDV) measurements.
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Fluid Flow and Performance Characteristics of a Cyclone Separator Operating Under Side Stream Conditions
This study has involved the investigation of the flows in a high efficiency cyclone separator and the performance characteristics of the cyclone when operating under the influence of base suction.<br/><br/>It has long been accepted that a bleed taken from the base region of a cyclone could, …
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Visualisation of dynamic flow processes using a novel pulsed multi-element hot-wire anemometer.
… and its multi-element applications to fluid flow visualisation. Unlike previous pulsed anemometers which have separate heating and sensing wires, the methods described here utilise a single wire as both heater and sensor. Therefore it overcomes some of the restrictions which apply to existing …
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Experimental and numerical study of hypersonic aeroelastic intakes
… a hypersonic wind tunnel to assess its dynamic flowfield, structural response, and performance. The experiments were informed with static 2D, full-scale static 3D, and fully coupled 2D and 3D aeroelastic simulations. The intake studied was a planar asymmetric body. It was comprised of an …
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Some Mixing Flows of Industrial Relevance
… is undertaken into the steady mixing flows generated by rotating cylindrical and disc stirrers in Newtonian and non-Newtonian fluids. No mixing study is carried out.<br/><br/>In Chapter 1, we briefly discuss the importance of the low speed mixing of fluids together with the processes …
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Scale-up of oscillatory flow mixing
Oscillatory Flow Mixing is a recent development in mixing technology which has evolved over the past decade. It has a number of similarities to other mixing technologies, particularly pulsed and reciprocating plate columns, but at the laboratory scale has demonstrated a number of advantageous …
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Hydroxyl-Radical Planar Laser-Induced Fluorescence Imaging of Turbulent Supersonic Combustion
Flow visualisation and statistical analysis of a supersonic, turbulent reacting flow from non-intrusive hydroxyl radical (OH) planar laser-induced fluorescence (PLIF) images are presented. The OH PLIF images show instantaneous structures of turbulence in two combustor configurations at different …
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Modelling of physical and chemical processes in the small intestine
… which enabled investigation into the fluid flow, mixing mechanisms and delivery of nutrients to the wall of the model small intestine. Designing, developing and using the Small Intestinal Model (SIM), a physical model of a section of the small intestine, mimicking the physiological …
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Extended surface fluidized bed heat transfer
… adjacent fins may be a contributory factor. Flow visualisation studies between a perspex extended surface and a fluidized bed using air at ambient temperatures, have demonstrated the effect of too small a fin spacing. Fin material and the bonding to the basic tube are more important in the …
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Spray drier simulation and air flow pattern studies
… within 10oC of experimental data. Air flow patterns have been investigated in a 1.2m diameter transparent countercurrent spray tower by flow visualisation. Smoke was introduced into various zones within the tower to trace the direction, and gauge the intensity, of the air flow. By means …
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Lift and drag forces on a submarine pipeline in steady flow
… The work relates to pipeline design. The various flow phenomena around a cylinder are theoretically analysed and an explanation of the phenomenon of lift provided. A thorough literature review was undertaken regarding the classical theory, as well as experimental and theoretical studies carried …
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Oil Transport in Piston Ring Assemblies
… oil consumption, friction and wear. Oil flow visualisation in the test rig using a high speed video camera allowed observation of cavitation in the diverging part of the ring through an optical liner. The high recording framing rates of the camera have permitted the initiation, …
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An experimental investigation of the use of air jet vortex generators to control shock induced boundary layer separation
… combination of high speed wind tunnel tests and flow visualisation in a water tunnel. The wind tunnel tests used the half aerofoil or 'bump technique' as used by Wallis. Bumps with thickness to chord ratios of 8%, 10% and 14% were tested. Increasing the thickness of the bumps resulted in higher …
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Study of a naturally oscillating triangular-jet flow.
This thesis reports on the structure of the flow inside a nozzle which produces a naturally oscillating jet flow. The nozzle consists of a short cylindrical chamber with a concentric triangular-inlet orifice at one end and a circular exit lip at the other end. This triangular-jet nozzle was …
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Unsteady aerodynamics using high-order methods
Unsteady flows occur in many applications of engineering interest. One category of unsteady flows occur as self-sustaining oscillatory fluid motion, such as the flow over rectangular cavities. There has been a significant amount of research performed on this topic over the years, both …
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The Influence of the Slot Aspect Ratio on the Flow Field of Synthetic Jets
… been a surge of research interest in developing flow-controlling devices, which can provide appreciable aerodynamic performance gain, do not require a large energy input from the operating device, and are cheap and lightweight at the same time. The synthetic jet actuator is one such device that …
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