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 25 for “"Airflows"”.
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Thin fluid films subject to external airflows
We use lubrication theory to analyse the steady flow of thin ridges, rivulets and rings of fluid and, in particular, we study the behaviour when the fluid is in the presence of an external airflow. Firstly, a thin ridge on an inclined planar substrate subject to a spatially varying pressure …
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Identification, elimination and reduction of barriers to the effective use of respiratory personal protective equipment
… the needs of workers, particularly as related to airflows and that current standards did not reflect the real-life workplace demands. This work set out to determine an improved methodology for users to determine the total inward leakage (TIL), the different types and quantities of airflows, …
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New turbulence models for indoor airflow simulation
… applied to predict different types of indoor airflows. The corresponding DNS or experimental data were used to validate the models. This study concludes that the two-layer models can predict airflows most accurately, better than many k -E models. The computing cost is significantly lower than …
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A study of the controllability of air movements in predominantly naturally ventilated houses.
The aim of this study is to measure interzonal airflows through different doorway openings, due to the effects of temperature difference and combined temperature and pressure difference. The method of measurement uses tracer gases which are injected into spaces and their growths and decays are …
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Energy consumption of building 39
… This thesis proves the unnecessarily high airflows and irresponsible fan use are the source of Building 39's wasteful consumption of energy. Research revealed that the recirculating fans drew the most energy and were continuously running on full power. If the fans were turned down during …
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Application of Background Oriented Schlieren (BOS) in Underground Mine Ventilation
… BOS can be used to attain qualitative data about airflows in complex areas and methane emissions from coal. The acquisition of such data would not only enhance the understanding of mine ventilation but also improve the accuracy of ventilation surveys. As an example, surveys can benefit from small …
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Experimental and Numerical Study of Air Flows in a Full Scale Room
… ranging from 0.1 ACH to 27.9 ACH showed that airflows inside the room were fully developed when the ventilation rates were equal or higher than 19.5 ACH. This was demonstrated by use of the maximum velocities decaying along the ceiling and the floor, flow topologies (including flow patterns, …
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Photophysics of hexanuclear [Re₆Q₈]²⁺ cluster compounds
… of numerous industries. In the specific area of airflows, the development of pressure sensitive probes (PSP), molecules sensitive to the pressure of air at a surface, has drawn much attention and is an important area of research and development. Molecules that are currently used for these …
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Understanding Thermal Conditions, Thermal Comfort and Adaptive Behaviours in Naturally Ventilated Multi-patient Wards in Connaught Hospital, Freetown, Sierra Leone
… the impact of relative humidity, indoor airflows, personal factors, and spatial, temporal, and seasonal conditions. A mixed-methods longitudinal field survey was conducted over nine weeks during the rainy (September 2016) and dry seasons (March-April 2017) in eight naturally ventilated …
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Deposition of Newtonian Particles Entrained in a Turbulent Axisymmetric Free Jet
… particle entrainment and deposition in turbulent airflows. One area of research needing further attention has been the study of particles entrained in axisymmetric air jets. An experimental rig was designed and built to study entrainment properties and deposition of Newtonian particles, after …
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Study of natural ventilation in buildings with large eddy simulation
… characteristics of different indoor and outdoor airflows helps to identify the best SGS model for those flows. By comparing the results of using large and small computational domains, an appropriate domain size is recommended to save computing time. It is also found that simulating the transient …
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Development of designer-relevant Lattice-Boltzmann Wind Field Model for urban canyons and their neighborhoods
… coded in C# language for three-dimensional urban airflows. Results of the model are validated with experimental measurements as well as conventional CFD tools for both wind velocity and pressure fields. To further enhance the computational efficiency, proper settings of inlet wind profile and …
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Theoretical Study of Laser Beam Quality and Pulse Shaping by Volume Bragg Gratings
… deformations are obtained for different rates of airflows. Simulation results are compared to the experimental data, and show good mutual agreement.
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Software for fault detection in HVAC systems in commercial buildings
… simultaneous heating and cooling and imbalanced airflows within several large air-handling units were targeted. Savings of around $22,500 were predicted when the fault of simultaneous heating and cooling was occurring over the entire month in an air handler. Some of the other faults include the …
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Interactions Between Dust and Ecosystem, and Landscape at Multiple Scales
… conditions reveal highly variable trans-Atlantic airflows. Elevated altitudes, higher temperatures, and lower relative humidity (RH) along summer trajectories implied the presence of Saharan Air Layer, whereas the frequent occurrence of higher RH (> 40%) and light precipitation in spring indicate …
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Lagrangian coherent structures and trajectory similarity: two important tools for scientific visualization
… velocity fields (e.g. blood vessels and airflows), and the measure of similarity for trajectories (e.g. hurricane paths). LCS surfaces and trajectory-based techniques (e.g. trajectory clustering) are complementary to each other for visualization, while velocity fields and trajectories are …
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Ventilation in minibus taxis as a means of airborne infection control
… the Issarow equation, a dose-response model. Airflows created by different window configurations produced patterns in airflow direction and velocity. A linear regression model fit to the ventilation data revealed that increasing taxi speed increased ventilation. Ventilation rates were found to …
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Robotic Olfactory-Based Navigation with Mobile Robots
… as challenging due to the turbulent nature of airflows and the resulting odor plume characteristics. The key to correctly finding an odor source is designing an effective olfactory-based navigation algorithm, which guides the robot to detect emitted odor plumes as cues in finding the source. …
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