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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 238 for “"Velocity Measurements"”.
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Laminar burning velocity measurements of stabilized aluminum dust flames
The laminar burning velocity of a stabilized dust flame is experimentally investigated in the present work. The dust used was aluminum powder with an average particle diameter of approximately 5 microns. Dust flames, in comparison to gas flames, are thicker and brighter, may be influenced by …
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Velocity Measurements for Turbulent Nonseparated Flow Over Solid Waves
Laser-Doppler velocimetry measurements have been made of nonseparated velocity fields over solid sinusoidal wavy surfaces. Time-averaged velocity and turbulent intensity data are given.
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A design for velocity measurements in the Gulf Stream,
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Near-wall velocity measurements in two-dimensional turbulent boundary layers
Significant differences involving near-wall velocity profiles in two-dimensional turbulent boundary layers when such data was plotted on law of the wall coordinates were reported by D. Coles in the Stanford Conference. These discrepancies can be especially important when near-wall velocity data is …
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Analysis of Refractive Effects on Mid-Latitude SuperDARN Velocity Measurements
… frequency switched SuperDARN plasma convection velocity estimates. Previous works have found a disparity between high latitude SuperDARN plasma convection velocities and those made by other devices. It was noted that the scattering volume’s refractive index was being neglected when estimating …
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Surface Velocity Measurements at the Aeolotron by Means of Active Thermography
This thesis presents measurements of the water velocity in the first few microns of the viscous boundary layer in the wind-wave facility Aeolotron by means of thermography. An active thermography method was used to create heat patterns, which were visualized by an infrared camera. In contrast to …
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Planar Velocity Measurements in an Incompressible and a Weakly Compressible Mixing Layer
For the weakly compressible mixing layer, the velocity ratio was 0.53, the density ratio was 0.67, and the convective Mach number was 0.38. At the location where the PIV images were obtained, Rex = 3.7 x 106 , Redw = 1.8 x 105, and Rx/lambda = 18. The planar velocity fields obtained in this study …
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Temperature, heat flux, and velocity measurements in oscillating flows with pressure variations
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1992
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Acoustic wave propagation and non-intrusive velocity measurements in highly concentrated suspensions
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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The study of shear and longitudinal velocity measurements of sands and cohesive soils
… variable results, especially for shear wave velocity, while the other methods yielded relatively consistent, reliable results as compared to published values. Finally, a new design for a triaxial setup that enables integrated measurements of compressional and shear velocities in soil over a …
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Incident shock Mach number effects on Richtmyer-Meshkov mixing with simultaneous density and velocity measurements
… time evolution of simultaneous, 2-D density and velocity fields for each Mach number. Several differences in qualitative flow features are identified as a result of Mach number variation, with differences in vortex interaction playing a critical role in the development of the flow field. Several …
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Investigating the use of hopped frequency waveforms for range and velocity measurements of radar targets
… the spurious free dynamic range (SFDR) of target measurements was required. This was done with the CLEAN technique [5] which could reduce sidelobe levels to below -60 dB and would allow smaller targets masked by the sidelobes to be uncovered. To analyse the practicality of this work, simulated …
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New high pressure phase transition of natural orthoenstatite and sound velocity measurements at simultaneous high pressures and temperatures by laser heating
… This is largely due to the lack of sound velocity measurements at sufficiently high pressure-temperature conditions and/or using only polycrystalline instead of single-crystal samples. To address the issues mentioned above, my dissertation involves two main topics Firstly, I discovered a …
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Ultrasonic velocity measurements of simulated lunar regolith with variable ice content: a laboratory and modeling investigation with implications for geophysical lunar resource exploration
… for future missions. To date, remote sensing measurements have established the presence of water ice within some craters near the lunar poles, but little is known about the distribution and concentration of ice throughout the lunar soil, or regolith. An upcoming NASA mission plans to directly …
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Velocity measurements of diffraction patterns on scattering of helium nozzle beam from (001) LiF cleavage plane by time of flight technique using metastable atoms.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1972
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Measurement of electromagnetic signal velocities in saturated fine-grained soils
Electromagnetic signal velocity measurements are common in soil disciplines, often involving Time-Domain Reflectometry. However, Time-Domain Reflectometry measurements are of limited use where velocity is frequency dependent, such as in finegrained soils. Therefore, Quarter-Wavelength Analysis was …
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A Generalized Log-Law Formulation For a Wide Range of Boundary Roughness Conditions Encountered in Streams
It is demonstrated that the method for locating a velocity profile origin, or plane of zero velocity, by fitting log profiles to streamwise velocity measurements is applicable to a larger range of roughness scales than previously expected. Five different sets of detailed, experimental velocity …
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Development and Testing of the Virginia Tech Doppler Global Velocimeter (DGV)
… measurement of planar three-component velocity data, was constructed and tested. The Virginia Tech Doppler Global Velocimeter (DGV) system was designed for use in the Virginia Tech Stability Wind Tunnel as a tool for investigating complex three-dimensional separated flow regions. The …
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Complex Equilibrium of Laterally Curved Wakes
… on laterally curved wakes. Single and two-point velocity measurements were taken on a plane and laterally curved turbulent wakes to understand the evolution and effect of lateral curvature into the far wake region. The analyses provide useful information in modeling curved or spiral wakes such as …
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Low temperature bulk modulus of solid argon
… back-reflection X-ray camera. Low temperature measurements, using helium as the pressure transmitting fluid, are reported which cover the pressure range of 10 to 300 bar. These measurements, which are the first direct measurements on a free-standing argon crystal in this pressure range, give a …
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