Global ETD Search
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Showing 1 to 6 of 6 for “"Helical flow"”.
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Helical flow of non-Newtonian fluids, with reference to drilling fluid flow.
… by a desire to understand better the complex flow of drilling fluids in oil wells. After an initial discussion of the flow and its complexities, mathematical models are considered, and a 'helical flow' model adopted as being a reasonable approximation to the flow which may be solved in …
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Computational model of coronary tortuosity
… a correlation between a degree of tortuosity and flow parameters in three simplified vessels with curvature and zero torsion. Next, a statistical analysis based on flow calculations of 23 patient-based real tortuous arteries was performed in order to investigate a correlation between tortuosity …
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A nonlinear river meandering model and its incorporation in a landscape evolution model
… (TSRM) model based on continuity of a simplified flow field through bends is developed. The equilibrium coupling between helical flow and sediment transport, as in Ikeda [1989] determines downstream variation of transverse bed slope. The model tests the hypothesis that meander development patterns …
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Analysis and design of a new updraft free-exit-flow low-head hydropower turbine system
<p>A new updraft free-exit-flow low-head hydropower turbine system is designed to enhance tailrace water quality, to minimize fish mortality in turbine flow passage, to improve turbine mechanical performance, and to reduce costs and time of hydropower development. This study applies the …
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Measuring flow and mixing at stream confluences using large-scale particle image velocimetry, in-stream techniques, and small unmanned aerial systems
Confluences, locations where two rivers flow into one another, are characterized by the mixing of water, dissolved nutrients, chemicals, pollutants, and sediment. The process of mixing at confluences is inherently related to patterns of confluent flows, yet the complex nature of confluence …
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Non-cohesive bank migration in meandering rivers and bank accretion in weakly braided rivers
… conditions of uniform, fully-developed bend-flow, the transverse slope at the base of the bank (the channel thalweg) is demonstrated to be zero when considering boundaries consisting of uniform non-cohesive alluvium. The helical flow contribution drives the transverse flux of sediment from …