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 14 of 14 for “"Hydraulic efficiency"”.
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Hydraulic efficiency of grate and curb inlets for urban storm drainage
… of this research program included evaluating the hydraulic efficiency of three storm-drain inlet types and developing design methodology. Denver Type 13 and 16 grate inlets and Colorado Department of Transportation Type R curb inlet were evaluated during the course of testing. Grate inlets were …
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Effects of Inlet Design on Hydraulic Efficiency and Sediment Cleanout of Bridge Deck Drains
Bridge deck drainage is driven by the hydraulic efficiency of inlets, which can be affected by grate design, downspout configuration, and debris accumulation. Inadequate drainage can result in hydroplaning, which can diminish highway safety. To evaluate the controls on drainage inlet efficiency and …
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Development of a computational tool and dynamometer for optimizing variable-speed centrifugal pump selection for a containerized, direct-drive photovoltaic electrodialysis desalination system
… pump selection methodology to improve the hydraulic efficiency of MIT’s Global Engineering and Research (GEAR) Center’s containerized, direct-drive photovoltaic electrodialysis desalination system capable of producing up to 300m3 of potable water per day. The novel flow-commanded current …
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Analysis and design of a new updraft free-exit-flow low-head hydropower turbine system
… a set of principles, criteria, and methods for hydraulic design of the new turbine. They include mainly an approach for designing the divergent runner chamber and a two-dimensional method for hydraulic design of runner blades. These methods are applied to design a new sample prototype …
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The Turgo impulse turbine : a CFD based approach to the design improvement with experimental validation
… a coarse mesh which slightly under predicts the efficiency but was suitable for comparing designs and a fine mesh which gave mesh independent results. The fine mesh took over 4 times longer to solve rendering it unfeasible for optimisation purposes and it was therefore used only at key points to …
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Structure-function relationships in the water-use strategies and ecological diversity of the Bromeliaceae
… bromeliad taxa. Special emphasis was placed on hydraulic and water relations traits because of fast-paced contemporary developments in these fields. The methodologies employed included an assessment of the diversity of bromeliad hydrological habitat occupancy, quantification of key anatomical …
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Hydrostatic Pressure Converters for the Exploitation of Very Low Head Hydropower Potential
… Converters. Scale models of these concepts were hydraulically tested, verifying the proposed theories, and providing data from which estimates of full scale performance were made. These predicted that the two proposed designs of Hydrostatic Pressure Converter were suitable for head differences …
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Seedling xylem anatomy of two Banksia species relative to availability of groundwater
… under these conditions, and xylem anatomy and hydraulic architecture are common traits studied to understand plant adaptations and responses to changeable water availability. However, little is known about the changes to the hydraulic architecture of groundwater dependent plants during their …
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A global sensitivity analysis of solar virus inactivation modeling
… rate constants. System reliability and efficiency of a solar-driven disinfection system can be improved by optimizing its geometry configuration for sunlight exposure. Further Monte Carlo simulation of a 3D continuous stirred-tank reactor model coupled with the integrated solar virus …
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Numerical and experimental investigation of flow in horizontal axis Pelton turbines
… However, manufacturers concerns over operating efficiency are a key driver in the continued design development. In recent decades, the use of Computational Fluid Dynamics (CFD) has become well established in the field of hydro turbine design, analysis and optimisation. However, the complex flow …
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Experimental Study of Nappe Oscillations on Free Overfall Structures
… the environmental and societal impacts of the hydraulic structure. Given the lack of quantitative information reported in literature and the inchoate understanding of the dominant processes underpinning nappe oscillations occurrence and development, the global objective of this PhD thesis was …
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Optimisation and efficiency improvement of pelton hydro turbine using computational fluid dynamics and experimental testing
… runner provided by Gilkes to produce better efficiency and simplify its design, 3) manufacturing of original and optimised design model runners and experimentally testing them. The numerical techniques created during part 1) included many numerical and physical assumptions to simplify the …
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Lightweight, affordable, low power solar groundwater piston pump for rural remote regions.
… at a certain head is termed as the required hydraulic energy which is maintained by the pump unit of SPWPS. However, this acts ultimately as a load on the PV generator. The pump unit typically requires more power in order to maintain this hydraulic energy. For high head systems, groundwater …
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Vegetative Anatomy of Rhododendron with a Focus on a Comparison between Temperate and Tropical Species
… (protection against catastrophic failure) and efficiency (high theoretical conductivity). Rhododendron wood and vessels were found to be relatively safe. The metrics of wood efficiency were higher for the tropical species. Thus, a trade-off between safety and efficiency was found although the …