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 22 for “"centrifugal pumps"”.
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Instabilities and unsteady flows in centrifugal pumps
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Disc friction loss in centrifugal pumps and hydraulic turbines
Dizertační práce je zaměřena na výzkum proudění v mezidiskových spárách hydraulických strojů s důrazem na čerpadla s nízkými specifickými otáčkami. Navzdory tomu, že tekutina v mezidiskových prostorách čerpadel zaujímá velmi malý objem, může výrazně ovlivnit proudění v celém stroji. To má následně …
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The effect of gas on multi-stage mixed-flow centrifugal pumps
… flow to the surface. Electrical Submersible Pumps consist of stacked centrifugal pump stages, each comprising a bladed impeller (rotating part) and diffuser (stationary part). In multiphase conditions, the gas tends to accumulate in the impeller, severely reducing the pressure produced by the …
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Experimental and theoretical study of two-phase flow in centrifugal pumps
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1981.
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The practicality of adaptable geometry centrifugal pumps in U.S. Navy systems
… impeller trimming, mechanically varying centrifugal pump impellers or volutes can significantly affect pump performance. This thesis explores the potential for performance enhancement by variable impellers as an alternative to, or possibly in conjunction with, popular pump improvement …
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Experimental determination of volute effects on the stability of low specific speed centrifugal pumps
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Adaptive Hydraulics for Improved Centrifugal Pump Efficiency
Centrifugal pumps are used ubiquitously for fluid transport in industrial and municipal systems including: clean and waste water systems, pumped hydro energy storage, closed loop HVAC heating, and irrigation. Globally, pumps consume hundreds of billions of kilowatt hours of electricity each year. …
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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
This thesis presents an optimized centrifugal 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 …
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Numerical and Experimental Analysis of a TurboPiston Pump
… of merits such as, high flow rates often seen in centrifugal pumps and high pressures associated with positive displacement pumps. The objective of this study is to manufacture a plastic model 12†TurboPiston Pump to demonstrate the working principle and a metal prototype for performance …
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Design and control of a spheroidal underwater robot for the inspection of nuclear piping systems
… no external appendages. It propels itself with centrifugal pumps which suck in water from the environment, and pump it out in various directions. This thesis covers the design and implementation of the software, electrical, and a few mechanical systems of the robot. Specifically, it details the …
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Characterization and scale-up of microbubble generation in column flotation
… to determine the reduction in the performance of centrifugal pumps under air admitting conditions. A semi-empirical pump model has been utilized which allows the proper size of pump to be selected for microbubble generation. This information should prove useful for the design and operation of …
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Coalescence of secondary dispersions in fibrous beds
… dispersions generated by a combination of centrifugal pumps . Inlet drop sizes were analysed using a Coulter Counter and outlet drops were sized photographically. A novel technique, involving conductivity measur ements at different planes in the bed, was developed to measure hold up …
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A theoretical approach to the prediction of haemolysis in centrifugal blood pumps
The successful use of centrifugal pumps as temporary cardiac assist devices strongly depends on the extent to which they damage blood. The development of a theoretical pump evaluation model was performed in this study to facilitate an effective pump optimisation. The optimisation process seeks to …
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An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries
… two systems each with two pipelines and separate centrifugal pumps. The four pipelines range from 50mm inside diameter to 140mm inside diameter. A data acquisition system continuously monitors pressures, velocity and temperature. Mixture concentration and velocity are checked using a weigh tank …
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Low load operation of turbine-driven boiler feed pumps
… the main turbine in order to drive multistage centrifugal pumps which supply the boilers with feedwater. With an increase of renewables in the energy mix, the need for Eskom’s coal-fired power stations to run for extended periods at very low loads has arguably never been this great. Various …
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Control configured design for smooth, highly-maneuverable, underwater vehicles
… system is developed by combining powerful centrifugal pumps with compact Coanda-effect valves. This system is used to design and construct a compact, multi-degree-of-freedom (DOF) prototype vehicle. To achieve precision orientation control, high speed valve switching is exploited using a …
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Development and Application of Rotation and Curvature Correction to Wray-Agarwal Turbulence Model
… such as those encountered in turbomachinery, centrifugal pumps and the rotating machinery in other industrial devices. The goal of this research is to enable the eddy-viscosity type turbulence models to accurately account for the rotation and curvature effects. To date, there have been two …
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Lightweight, affordable, low power solar groundwater piston pump for rural remote regions.
… For high head systems, groundwater piston pumps perform better than centrifugal pumps. A detailed literature review established that the current piston pumps have design limitations that act as load on the pump driver, which uses extra external and internal mechanical components. These …
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Photovoltaic water pumping : a case study in Kwazulu
… with those of diesel, petrol, and electric pumps. The social evaluation was based on three sets of interviews over a period of five years ranging from before the introduction of the pump to four years afterwards. The following are the most important conclusions. Technical: the system Daily …
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