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 123 for “"Flowrate"”.
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Signal validation methods and architecture for EBR-II natuural circulation flowrate
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1985.
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Evaluation of exhaust flowrate measurement techniques for a mobile emissions monitoring system
… the emissions concentrations the total exhaust flowrate through the engine must be determined. The devices evaluated were an Annubar, an Accutube, a hot film anemometer, a Pitot static tube, a venturi, and a vortex shedder.;The evaluation of the devices was broken down into two parts, the first …
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Flow resistance corrections for physical models using unit flowrates
… Evaluating physical models using a scaled unit flowrate provides a method by which the length-scale factor may be minimized. In this way, a scaled design discharge per unit width of channel is applied to a channel that is less wide than the prototype design. Using this approach greatly improves …
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Characterization of Arterial Flow for Junctional Bleeding Control
<p>This study investigated reducing volumetric flowrate under steady flow conditions by varying lengths of compression with constant cross-sectional area and varying cross-sectional area reduction with constant length in order to better understand how to control junctional hemorrhaging. The …
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Performance prediction model for positive displacement helical screw flowmeters
… loss for a given speed. This pressure loss times flowrate is then energy balanced against all internal loses. Pressure loss and speed are the reasons for leakage. Rotational speed times the theoretical swept volume is the theoretical flowrate and this flowrate, when combined with leakage flow can …
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Hydrodynamics and gas dispersion in industrial flotation cells
… analysed in terms of key variables including air flowrate, impeller speed and location in the cell. The bubble size was found to increase with increasing air flowrate and decreasing impeller speed. Bubbles in the impeller zone were found to be smaller than bubbles in the quiescent zone due to …
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A combined microfluidic/dielectrophoretic microorganism concentrator
… enhancements up to 40x at 500 gl/min flowrate using polystyrene microspheres and up to 10x at 100 gll/min flowrate using B. subtilis spores are achieved.
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Poly (2,6-dimethyl-1,4-phenylene oxide) hollow fibres for gas separation.
… studied were the length of the air gap, the flowrates of the bore liquid and polymer solution and the presence of 2-ethyl-1-hexanol in the polymer solution used for spinning. A one-factor-at-a-time approach was used to show how these variables affected the outer diameter; wall thickness and …
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Design, Fabrication, and Testing of a 3D Printer Based Microfluidic System
… through the characterization of the micro-pumps flowrate with respect to the pumps driving pressure and the actuation frequency. Tested at a driving pressure of 10psi, the flowrate for device 1 peaked at 75µL/min with a 7Hz actuation frequency before failing, while device 2 peaked at 498µL/min …
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Numerical and experimental study of the impact of temperature on relative permeability in an oil and water system.
… between 40 to 80 °C). Three levels of injection flowrates (0.5, 0.75 and 1.0 mL/min) and two oil viscosities (43 cP motor and 21 cP mineral oil – at 60 oC) were used in the study. A history matching approach using the commercial software Sendra was used to determine the oil-water relative …
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Flow patterns and energy dissipation rates in batch rotor-stator mixers
… generated periodic fluctuations of jet velocity, flowrate, torque and energy dissipation rate around the holes. The kinetic energy balance based on measured velocity distribution indicated that about 70% of energy supplied by the rotor was dissipated in close proximity to the mixing head, while …
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A study of microwave induced plasmas
… cavity. One being supported on an argon flowrate of 0.1 1 min-1 using a Babing!qn nebulizer, the other on a flowrate of 1.0 1 min-1 using a crossflow nebulizer. The crossflow nebulizer was also used for an analytical MIP generated in a TM 010 cavity.
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A hydrodynamic investigation of platinum flotation in a pilot flotation plant
… determine the effect of impeller speed and air flowrate on the flotation of platinum in mechanical flotation cells.
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The Effect of Waveform Shape on Dynamics and Kinematics of the Flow in Endovascular Stents
… of waveform shape and extension of negative flowrate are studied at two Reynolds numbers (Re = 80, Re = 200) on stented channels by looking at the kinematics and dynamics of the flow. The waveforms are reconstructed by Fourier decomposition of a waveform corresponding to left anterior …
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Flooding and non-equilibrium in counter-current flows with reference to pressurised water reactors
… two opposing waterfalls, an increase in air flowrate caused the waterfalls to move closer together until a critical air flowrate was reached where the waterfalls collapsed. A theoretical model was also developed to define this collapse condition which was shown to be-analogous to the choked …
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Mathematical modelling and control of agitated extraction columns
… input variables (agitator speed, solvent feed flowrate and concentration, feed concentration and flowrate) to the output variables (raffinate concentration and extract concentration) using the asymptotic method of system identification. The reduced-order models were shown to be accurate in …
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Calibration of Snowmaking Equipment for Efficient Use on Virginia's Smart Road
… include nozzle configuration, water pressure and flowrate, compressed air pressure and flowrate, tower orientation, snow inducer concentration, water and compressed air temperature, and ambient weather conditions. Testing and data collection was performed at the Snow Economics, Inc. research and …
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Determining the Sustainability of Coal Mine Cavity Discharge as a Drinking Water Source
… study in Dickenson County, Virginia. A flowrate monitoring system was installed at the point of discharge from the mine, and the flow records from three months of data collection were analyzed. The recording period included one of the driest periods in recent years, and the flowrate data …
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The effect of wind fluctuations on the membrane of a stand-alone wind powered seawater Reverse Osmosis (RO) desalination unit
… in terms of variations in membrane inlet flowrate and/or pressure, was investigated experimentally. The RO membranes applied in this project,were spiral wound module, Model: DOW FILMTEC, SW30- 2521 used individually in the rig for each test. The experiments were conducted using a modified …
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Slurry flowmetering using correlation techniques
… that most are unsuited for measuring the flowrate of abrasive and corrosive slurries such as are found in the gold mining industry in South Africa. An alternative flowmeter based on cross-correlation techniques is thus proposed. Random signals generated by the flowing fluid are measured at …
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