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 56 for “"Particle velocity"”.
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Effect of propagation direction on particle velocity
Includes bibliographical references.
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Underwater communication via particle velocity channels : principles, channel models, and system design
… components of the acoustic field such as the particle velocity, which cannot be obtained by a single scalar pressure sensor. In the past few decades, extensive research has been conducted on the theory and design of vector sensors. On the other hand, underwater acoustic communication systems …
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Laser Doppler velocimetry measurements of particle velocity fluctuations in a concentrated suspension
… spheres in Newtonian fluids suggest that the particles nijgrate in response to gradients in "suspension temperature," defined as the average kinetic energy contained in the particle velocity fluctuations. These models have not yet been compared systematically with experimental data. In …
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The measurement of particle velocity and suspension density in pneumatic coal injection systems
… such that the independent measurement of average particle velocity and suspension density are required in order to measure mass flow rate. The measurement of average particle velocity was shown to be achievable by either of two techniques, whilst the measurement of suspension density proved more …
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Investigation of Particle Velocity and Drag with Spherical and Non-Spherical Particles Through a Backward Facing Step
… applications exist where dispersed solid particles are transported within a turbulent accelerating or decelerating gaseous flow. The large density variation between phases creates the potential for significant differences in velocity known as velocity slip. Flow over a backward facing step …
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The development of an ultrasonic Doppler bed-load velocimeter
A instrument has been developed for measuring the velocity of solid particles adjacent to the pipe wall in a solids-liquid pipeline. It has been based on the Doppler shift principle and employs ultrasonic methods for detecting the bed-load particle velocity. Its application is in the mining …
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The measurement of the velocities of particles in an air-solid flow
… accurate experimental work on two-phase flows. Particle velocity is an especially important property, but most available techniques either disturb the flow or are slow or inaccurate. The laser-Doppler velocity meter, LDV, was developed for measurements in single-phase flows, but it has been …
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A Numerical Study of Supersonic Rectangular Jet Impingement and Applications to Cold Spray Technology
Particle-laden supersonic jets impinging on a flat surface are of interest to cold gas-dynamic spray technology. Solid particles are propelled to a high velocity through a convergent-divergent nozzle, and upon impact on a substrate surface, they undergo plastic deformation and adhere to the …
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Characterisation of fouling behaviour with direct observation technique for membrane bioreactor applications
… erosion mechanisms depending on cross-flow velocity. The fouling mechanisms during crossflow filtration of bentonite-biopolymers mixtures were observed as three-stage-fouling: hindered transport diffusion, pore plugging and rapid cake deposition. The presence of alginate on bentonite fouling …
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The application of laser measurement techniques to the pneumatic transport of fine particles
… from a low powered laser is scattered by seeding particles in the fluid which are small enough to follow the flow. The resulting Doppler shift of the scattered light is proportionate to the velocity of the particles and hence, to the velocity of the fluid. When solid particles are conveyed …
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Airborne Pollutant Spatial Distribution, Emission, and Ventilation Effectiveness for Mechanically Ventilated Livestock Buildings
… was used to predict the spatial distribution of particles less than 10 mum in diameter (PM10) in the swine building. Results showed that the magnitude of the predicted concentrations was significantly higher than the measured concentrations which could be attributed to the assumption of the …
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Acoustic vector-sensor array performance
… only, but acoustic vector-sensors also measure particle velocity. Velocity measurements can increase array gain and resolve ambiguities, but make vector-sensor arrays more difficult to analyze. This thesis derives a new set of useful performance measures for acoustic vector-sensor arrays. It …
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An investigation of the generation of acoustic emission from the flow of particulate solids in pipelines
… parameters, particularly the mass flow rate, velocity and size of particulate solids in the pipeline, has yet to be developed. This is mainly due to the fact that numerous problems, including insufficient signal generation, particle deposition in sensing vicinity, inhomogeneous particle and …
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Development of an Energy-Based Nearfield Acoustic Holography System
… to the vibrating structure to obtain the normal velocity profile on the source surface. With the source surface velocity profile known, the acoustic pressure, particle velocity, and intensity generated by the source can be reconstructed anywhere in space. The precision of source reconstruction is …
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Acoustic vector-sensor array processing
… Acoustic vector-sensor arrays, which measure particle velocity and pressure, offer significant potential but require fundamental changes to algorithms and performance assessment. This thesis develops new analysis and processing techniques for acoustic vector-sensor arrays. First, the thesis …
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STUDY OF THREE-PHASE AIR-BRINE-SALT COUNTERFLOW IN AN INCLINED PIPE
… at 30°, utilizing air, saturated brine, and salt particles. A wide range of gas and liquid superficial velocities were tested. High-speed and standard-speed video recordings, pressure, and fluid level measurements were used to analyze flow regimes, bubble characteristics (length, velocity, depth, …
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Development of an Experimental System to Generate and Characterize Supersonic Aerosol Particles Using Laser Doppler Velocimetry
… aerosols and the surface damage resulting from particle impacts during flight. To investigate and characterize the damage potential of aerosol particles at flight speeds, a bench-top system was developed. This system is characterized in this thesis in its ability to generate monodisperse …
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High temperature erosive wear of a boiler tube steel
… of simulating the conditions of temperature, particle velocity and flux as found in the economiser region of pulverised fuel boiler combustors in electricity generation power plants. The work has encompassed the effects of particle type, size, velocity and flux on the erosive wear rates of the …
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Linear Modeling and Analysis of Thermoacoustic Instabilities in a Gas Turbine Combustor
… forcing, the air-side coupling of acoustic particle velocity to inlet fuel mass fraction, transport delays present in the mixing nozzle and combustion chamber, and dynamic heat release excitation from unsteady inlet fuel mass fraction. By examing the frequency response with linear stability …
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Optimal Parameters for Doubly Curved Sandwich Shells, Composite Laminates, and Atmospheric Plasma Spray Process
… and the current, that result in the desired mean particle temperature and the mean particle velocity when they reach the substrate. These optimal values give the desired mean particle temperature and the mean particle velocity within 5% of their target values.
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