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 “"draft tube"”.
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Head augmentation in hydraulic turbines by means of draft tube ejectors
The use of draft tubes with annular injection was investigated with respect to low-head applications. A numerical model was developed and refined to fit the data from two laboratory test models. The latter model was a laboratory scale hydropower system which demonstrated 20-31 per cent head …
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High density animal cell culture systems using porous supports
… ceramic perfusion system, an airlift systemwith draft tube made of porous ceramic and a stirred tank configuration which used porous polystyrene microcarriers. The porous matrices provide an increased surface area for cell attachment and growth and protect the entrapped or immobilized cells from …
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Foam control utilizing hydraulic forces of an accelerated liquid surface and characterization of durable foams by application of an external force
… accelerated converging flow through a down flow draft tube. The principles of the method were based on the creation of differential shearing forces at the foam-liquid interface to cause disruption of foam at the interface and subsequent re-entrainment during the convergence of flow through the …
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Viscous liquids in bubble columns
… liquids in bubble columns with, and without, draft tubes. The importance of the parameters influencing bubble column reactors is discussed with reference to previous work. The shapes and rise velocities of single bubbles in these liquids were studied in an 8.8cm diameter column, and the gas …
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Computational Scheme Guided Design of a Hybrid Mild Gasifier
… and employed to determine the appropriate draft tube dimensions, entrained flow residence time, The simulations also help determine the appropriate operating fluidization velocity range to sustain the fluidized bed depth without depleting the chars or blowing the char away. The results are …
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A novel reactor with two independently-driven impellers for gas-liquid processing
… independently driven impellers and a cylindrical draft tube (IDDIDT i.e. an acronym for "Independently Driven Dual Impeller with Draft Tube") Studies have been undertaken in a 0.75 m Perspex proto-fermenter employing a Rushton turbine (6RT) and a Scaba 3SHP1 axial flow impeller, with test fluids …
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Coating studies and video imaging of the flow patterns of tablets in a semi-circular fluidized bed
… measure the velocity and voidage profiles in the draft tube region of the semi-circular fluidized bed coater. Continuous and pulse coating runs were performed to study the variation in coating consistency. This variation was explained in-terms of coating-per-pass variation and the cycle time …
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An experimental study of improvement of a micro hydro turbine performance
… on the design of guide vanes, runner blades and draft tube of axial flow turbines, these components being usually regarded as areas which have major impact on the performance of hydraulic turbines. The next chapter gives the details of the test circuit that was constructed. This could provide …
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The kinetics and mechanisms of the oxidation and precipitation of iron : the high density sludge (HDS) process
… fitted with four equally spaced buffles and a draft tube to maximise mixing. Ferrous iron (Fe2+) was added as FeSO4.7H2O at initial concentrations of 200 mg/L and oxidised using air. pH control was achieved by titration with either 0.1 M NaOH or 0.1 M H2SO4 through a custom made Hitech Micro …
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A hydrodynamic study of nickel suspension in stirred tanks
… there is a bottom clearance range in which a draft tube can aid mixing in a tank stirred by the Rushton turbine. In the solid-liquid system, a hydrofoil impeller was used to investigate the influence of simulation strategies, particle properties and hydrodynamic operating conditions on mixing …
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Optimalizace difuzoru vodní turbíny s využitím adjoint řešiče
Tato práce se zabývá tvarovou optimalizací difuzoru vírového generátoru, který napodobuje oběžné kolo Francisovy turbíny. Optimalizace je založena na použití adjoint řešiče v programu ANSYS Fluent. Hlavním cílem bylo potlačení vírového copu v mimooptimálních režimech. Byla vytvořena metodika …
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Control de minicentrales hidroeléctricas fluyentes : modelado y estabilidad
… flow between the intake reservoir and the draft tube enhances the plant stability. Once the stability the small hydropower plant in its three typologies has been studied, a heuristic criterion is proposed in order to tune the gains of the PI controller that modifies the wicket gates of the …