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 101 for “"rotational speed"”.
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Rotational speed dependent motor properties
… back electromotive force (EMF) at high rotational speeds, which acts against applied voltage and drops motor efficiency steeply. By reducing the magnetic flux surrounding the coil of the stator, back EMF can be reduced and motor efficiency can be maintained at any rotational speed. …
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Effects of feed oil content, transmembrane pressure and membrane rotational speed on permeate water quality in high-shear rotary ultrafiltration
… the effects of transmembrane pressure, membrane rotational speed and feed oil content on permeate water quality in the treatment of a synthetic metal working fluid in the HSRUF system. Permeate oil grease and total organic carbon concentrations increased with transmembrane pressure and feed oil …
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Resistance-in-series modeling in high-shear rotary ultrafiltration
… (HSR-UF), disk membranes are rotated at speeds up to 1,750 rpm to generate hydraulic turbulence, which scours the membrane surface. Thus, the pump is required only to provide transmernbrane pressure and a small amount of recirculation.;A parametric waste-specific study was conducted to …
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Effects of blade damage on low pressure ratio fan windmill aerodynamics
… continues to spin due to the aircraft forwards speed. This condition leads to high levels of drag, and the fan operates at very low rotational speeds. Windmill often follows damage to the fan, which will lead to large out-of-balance centrifugal loads in the engine. In combination with the low …
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Experimental and CFD–PBM investigation of an agitated bioreactor using a dual helical ribbon impeller
… shear thinning fluid. The effects of impeller rotational speed, gas flow rate, clearance to the bottom, and viscosity on power uptake and mixing time have been studied. This study suggests that determining optimum operating conditions can minimize power consumption and time required to achieve …
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The development of process technology for the friction stir welding of thick section aluminium alloys
… particularly tool pin form in conjunction with rotational speed, applied force and processing temperature can account for joint formation during FSW (friction stir welding).
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Heat Transfer and Thermal Process Design in Scraped-Surface Heat Exchangers
… variables tested were steam pressure, blades rotational speed, inlet
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Trackable Features Provide a Cue to the Angular Velocity of Rotating Objects
… a fixed angular velocity. Does the perceived rotational speed of an object correspond to its angular velocity, linear velocities, or some combination of the two? We had observers perform relative speed judgments of different sized objects, as changing the size of an object changes the linear …
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Theory for hydrostatic gas journal bearings for micro-electro-mechanical systems
… the MIT micro-engine project is to develop high-speed rotating Power MEMS (Micro-Electro-Mechanical Systems) using computer chip fabrication technologies. To produce high power (10-50 W) in a small volume (less than one cubic centimeter), the micro-turbo-machinery must be spun at a rotational …
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Directly enhancing the photocatalytic transformation of CO2 and water to renewable fuels.
… that reactor properties such as propeller rotational speed were found to enhance the photo activity of the system through the elimination of mass transport limitations and increasing light penetration. The optimum conditions for H2 evolution were found to be a propeller rotational speed of …
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Corrosion Inhibitor for Potash Solution Mining
… in a saturated potash brine at 85°C, 1 bar and a rotational speed of 1940 rpm. Hexamethylenetetramine (HMTA) satisfied all screening criteria with an inhibition efficiency in the range of 90% and was further evaluated for its inhibition performance not only on CS 1018 but also J55 steel in respect …
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A Comparative Study on Micro Electro-Discharge Machining of Titanium Alloy (TI-6AL-4V) and Shape Memory Alloy (NI-TI)
… was found that the voltage, capacitance and tool rotational speed had significant effect on machining time. The machining time was reduced by increasing the voltage, capacitance and tool rotational speed. The machining time was found to be comparatively higher for machining NiTi SMA than Ti alloy. …
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Application of the Vortex Fluid Device (VFD) in Polysulfone Synthesis and Ultra-filtration Membrane Fabrication for water treatment purposes
… while investigating the effect of changing the rotational speed of the VFD and Graphene Oxide (GO) incorporation into PSF based membranes along with their filtration performances. Initially, Polysulfone (PSF) was prepared under high shear in the VFD operating in the confined mode, and its …
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The effect of ball mill operating parameters on mineral liberation
… The operating parameters studied include mill rotational speed, ball size, mill charge, and wet versus dry grinding. Breakage rates have been determined experimentally utilizing a SEM-IPS image analyzer. The mineral sample used was acquired from ASARCO's Young Mine which is located in Jefferson …
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Effects of Welding Parameters On Mechanical Properties of Aa7050 Fsw Joints
… Controlled welding parameters included welding speed (translational), rotational speed and in some cases the ambient environment. Auxiliary cooling (vortex air cooling and underwater welding) was used to modify the welding environment. Weld properties and features examined included interface …
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Mode I Fracture Toughness Testing of Friction Stir Processed HSLA-65
… on toughness, welds were produced using two rotational speeds: 340 RPM and 490 RPM. The weld centerline, advancing side hardened region (ASHR), and TMAZ/HAZ regions were sampled, in addition to un-welded parent material. All elastic-plastic fracture toughness values were thickness dependent. …
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Analyzing Vibration in Omni-Wheels: A Design of Experiments Approach to Optimizing Omni-Wheel Selection
… considering factors such as wheel type, rotational speed, applied load, and wheel orientation angle. Individual regression models were developed for each of six wheel types, treating operational parameters as continuous variables. Vibration levels were measured using root mean square …
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Development and use of a discrete element model for simulating the bulk strand flow in a rotary drum blender
… (flight height, number of flights, blender rotational speed, and blender fill level) on bulk strand flow. The results were analyzed with regards to overall trends and by focusing on two perspectives, end users and blender manufacturers. It was found that there was a strong relationship …
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Archimedean Screw Turbine Based Energy Harvester and Acoustic Communication in Well Site Applications
… number of blades, screw length, screw pitch, and rotational speed was conducted through CFD analysis using Ansys Fluent in order to determine the optimal geometry and operating conditions. The relationship between power generation and AST geometries, such as AST length and AST pitch, were …
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Effects of blade configuration on flow distribution and power output of a zephyr vertical axis wind turbine.
… of the wind freestream velocity and the rotor's rotational speed. The simulation results exhibit close agreement with a stream-tube momentum model.
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