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 195 for “"Mass Flow Rate"”.
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Independent control of a molten stream temperature and mass flow rate
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Development of semi-empirical models to measure mass flow rate of solids in an air seeder
… in the 1950s, it still lacks in the area of mass flow measurement of conveyed solids. An effective method of on-line seed flow monitoring is important to reduce product wastage and also, to anticipate plugging in the lines. The goal of this research has therefore been to develop methods to …
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Analysis of a Flat-Plate, Liquid-Desiccant, Dehumidifier and Regenerator
… takes into account the desiccant, water and air flow streams. A parametric analysis was performed to evaluate the influence of some of the most important operational parameters on mass transfer performance, such as flow configuration, water mass flow rate and inlet temperature, and desiccant mass …
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Optimal Sizing and Control of Hybrid Rocket Vehicles
… specific mission. In a hybrid rocket engine, the mass flow rate of the oxidizer can be throttled to enhance the performance of the rocket. First, an analysis of the internal ballistics and the ascent trajectory has been carried out for different mass flow rates of the oxidizer as a function of …
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Evaluation and visualization of refrigerant two-phase flow in distributor
This study aims at understanding flow distribution exiting thermostatic expansion valve and through distributor. It is well known that when two-phase flow goes through separation devices such as distributors and headers, mal-distribution is unavoidable due to different properties of liquid and …
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An experimental study of the wall characteristics of a local fluid constriction plasma generator
… efficiency is nonzero. This length varies with mass flow rate, current, and duct diameter. Nondimensionalization of the energy equation results in a dimensionless S parameter which determines the thermal development length. The S parameter is the product of mass flow rate, electrical …
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Determining internal leakages of high pressure and temperature steam valves
… that is leaking internally. As the leakage steam flows through the length of un-insulated pipe, it will lose a portion of its heat energy through the pipe wall to the surrounding environment. This will result in a drop in temperature of the steam from the upstream to downstream points of the …
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Computational assessment of turbine rim seal system parametric variation on hot gas ingestion and flow pattern
… parametric variation on hot gas ingestion, flow pattern, and turbine stage efficiency. The parameters focused on are purge to main mass flow rate ratio, axial gap to rim radius ratio, radial gap to rim radius ratio, normalized axial position of the blade leading edge, and internal purge …
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Transferência de calor no escoamento bifásico de dois componentes, regime anular, tubo vertical
… heat transfer coeficient during the two phase upflow (water + air) in vertical tubes was developped. The design and construction of the equipment is then discussed. The experiments were carried out in one tube, 6mm int and 1500mm of length, which suffered heat fluxes ranging 2 from 0,225 to 0,704 …
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Active noise control of supersonic impinging jet using pulsed microjets
… active noise control of supersonic impinging jet flow using unsteady microjet injection. Supersonic impinging jet involves several problems such as lift loss, ground erosion, significant noise pollution, and sonic fatigue, all of which are dominated by impinging tones mainly caused by well-known …
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A numerical investigation of s-duct flows with boundary-layer ingestion
… conducted to further NASA's study of active flow control systems for a flush-mounted inlet with significant boundary-layer ingestion (BLI). In conjunction with a NASA-sponsored research grant, the aim is to further accumulate knowledge and insight on the effectiveness of flow control …
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Numerical Investigations of Air Flow and Heat Transfer in Axial Flux Permanent Magnet Electrical Machines
… heat transfer from the stator where heat is generated in the copper windings. On the other hand the heat transfer to the rotor needs to be minimised in order to keep the magnets' temperature as low as possible. The cooling can be improved by acting on design parameters, such as the distance …
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Experimental Investigation of a Flush-Walled, Diamond-Shaped Fuel Injector for High Mach Number Scramjets
… 313 K into a nominal Mach 4.0 crossstream airflow. These conditions are typical of a scramjet engine for a Mach 10 flight, and heated helium was used to safely simulate hydrogen fuel. The injector was tested at two different injectant conditions. First, it was investigated at a baseline mass …
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Testing and modeling of compressors for low-lift cooling applications
… program is written to maintain a constant saturated suction temperature, suction temperature, and saturated discharge temperature. The program was able to maintain control with errors of ±0.2 °C at most points. At each test point, refrigerant mass flow rate, compressor input power, and …
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Performance measurement and visualization on the refrigerant distribution in the vertical manifold of the microchannel tube heat exchanger
… length and microchannel number. The inlet mass flow rate (min) and quality (x) are two main parameters affecting the distribution. The inlet quality was varied from 0.2 to 0.8, and the inlet mass flow rate was varied from 0.8 to 4.5 g/h per microchannel. For all three manifolds, the best …
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Mathematical model for improved mass flow estimation in the feeder housing of a forage harvester
… of precision agriculture practices, accurate yield maps are needed. These yield maps depend on accurate mass flow measurements made during harvest, measurements that are difficult to make because of variability in yield and crop conditions within each field. One way to estimate mass flow …
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Heat transfer from a spherical surface by jet impingement: an experimental study
… documented experimentally. Average heat transfer rates from a sphere maintained at constant temperature, by means of an internal electronic heater, and subjected to single or multiple jet impingements were obtained and related to the exit conditions of the impinging air jet(s) and to geometric …
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Heat Transfer and Film Cooling Performance on a Transonic Converging Nozzle Guide Vane Endwall With Purge Jet Cooling and Dual Cavity Slashface Leakage
… and varying slashface coolant leakage mass flow rate on the thermal performance for a 1st stage nozzle guide vane axisymmetric converging endwall. An upstream doublet staggered cylindrical hole jet cooling scheme provides additional purged coolant with consistent conditions throughout …
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A multidisciplinary algorithm for the 3-D design optimization of transonic axial compressor blades
… 3-D changes in blade shape. The algorithm incorporates zero and first-order optimization techniques including sensitivity analyses and one-dimensional search methodology. It features an iterative finite element structural analysis as well as a cold shape correction procedure to ensure that the …
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