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 12 of 12 for “"separation zone"”.
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Discharge coefficients for broad-crested weirs of low aspect ratios
… investigation of the geometry of the weir crest separation zone using a flow visualization technique is reported. Data from the literature for broad-crested weirs of large crest widths are also analyzed for comparison with the theory. Correlation between the experimental coefficients and the …
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Experimental investigation of normal, sonic injection through a wedge-shaped nozzle into supersonic flow
… the size of the three-dimensional boundary layer separation zone in front of each nozzle, and nanoshadowgraph photography was used to visualize the system of shocks and the flow field of each nozzle. Mean flow quantity profiles at several lateral stations were made at three downstream locations. …
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The Effects of Vortex Generator Jet Frequency, Duty Cycle, and Phase on Separation Bubble Dynamics
… have proven to be effective in minimizing the separation losses on low-pressure turbine blades at low Reynolds numbers. Experimental data collected using phase-locked particle image velocimetry and substantiated with a hot-film anemometer were used to answer fundamental questions about the …
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Numerical Simulation of Vortex Generating Jets in Zero and Adverse Pressure Gradients
… gradient was applied, inducing a laminar separation zone on the plate. A pulsed angled jet induced strong spanwise vortices in the separated shear layer which appear to weaken the separation zone and allow the bulk jet fluid to flush the remaining low-momentum fluid out of the domain. It …
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The role of aerothermochemistry in double cone and double wedge flows
… visualize various flow features including: the separation zone formed in the corner, the triple point interaction, and a supersonic shear layer. From these images, a separation zone length scaling parameter is determined. This parameter, derived for wedge geometries, is successfully applied to …
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Integration of a cob separation system into a biomass harvesting combine
… the focus on harvesting corn cobs. A corn cob separation system was developed and installed on a single pass biomass harvesting combine. The system included a blower and two fans and the combine was capable of harvesting grain only, grain and stover, and grain and cobs. The cob separation …
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The morphology of the Kakumbi concave bank bench on Luangwa river
… study concludes that the development of a flow separation zone on the concave bank of the Kakumbi meander has resulted in the accumulation of sediments during bankful discharge and the subsequent development of the bench. This has provided the mechanism for reversing the process of channel …
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The development of passive flow control vortices
… floor of a 350mm by 250mm wind tunnel and had a separation zone on its trailing edge.<br/>Surface flow visualisation was used to select VVG spacings and SJVG velocity ratios for effective separation control and investigate surface flow. Instantaneous and mean parameters downstream of the VVG and …
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The flow structure of interacting barchan dunes
… the flow, manifested by a significantly shorter separation bubble and both reduced streamwise velocity and turbulence intensity in the downstream barchan dune leeside, as compared to an isolated barchan. The volumetric ratio associated with the ‘splitting’ behavior (Vr=0.175) of Endo et al. …
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The sedimentology and dynamics of mega-dunes, Jamuna river, Bangladesh
… conditions. Lee side angle, which effects flow separation downstream of the dune crest and hence turbulence production and flow resistance, ranges from 2° to 58° and steepens with flow stage. There is little evidence of dune flattening with increasing flow stage, indicating that flow conditions …
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From meander bend to oxbow lake: morphodynamics and sedimentology of chute cutoffs
… the outer bank of the cutoff channel; (3) flow separation along the inner bank of the cutoff channel(s); (4) convergence of flows from the cutoff channel and the main bend at the downstream end of the chute cutoff channel (cutoff mouth), which promotes the development of counter-rotating helical …
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Numerical investigations of flow behavior and energy losses in open channel junctions
… secondary circulation, post-confluence flow separation, contraction and backwater effects. These effects in turn result in a large number of parameters required to adequately describe the energy losses and flow structures associated with the different flow behavior and mechanisms due to flow …