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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 543 for “"velocimetry"”.
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Point Doppler velocimetry measurements in circular jets
… made to an existing 2-component Point Doppler Velocimetry (PDV) system to improve instrument accuracy and repeatability and to reduce mean velocity offset. Most importantly, the original iodine cells have been replaced by vapor-limited iodine cells that are not influenced by room temperature …
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Acoustic Particle-Image Velocimetry: development and applications
Particle Image Velocimetry (PIV) is a non-intrusive technique for simultaneously measuring the velocities at many points in a fluid flow. The fluid is seeded with tracer particles and the region under investigation is illuminated. An image of the illuminated region is captured and then, a short …
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Three-dimensional particle tracking velocimetry for turbulence applications
Three-dimensional particle tracking velocimetry (3D-PTV) is a flow measure- ment technique that tracks the Lagrangian paths of a set of particles using photogrammetric principles. This technique allows to investigate complex fluid flows by measuring velocity and acceleration along particle …
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Particle Image Velocimetry Study of Density Current Fronts
The laboratory facility used allows the study of the front in a stationary setting, and also in its natural advancing state, for the case of a constant input of dense fluid to the system. These two settings are complementary, as the former highlights the mixing processes at the interface of the …
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Thermographic particle image velocimetry: from phosphorescence to incandescence
Thermographic PIV is a promising technique that enables simultaneous temperature and velocity imaging in flows with intentional seeded phosphor particles. This is highly attractive to researchers in fluid mechanics and combustion, as it directly visualizes the heat and mass transfer process in …
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Holographic particle image velocimetry : computational simulation and reconstruction
Thesis (Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1999.
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DARTPIV : Dynamic Adaptive Real-Time Particle Image Velocimetry
Particle Image Velocimetry (PIV) is a technique that allows for the detailed visualization of fluid flow. By performing computational analysis on images taken by a high-sensitivity camera that monitors the movement of laser-illuminated tracer particles over time, PIV is capable of producing a …
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3D particle tracking velocimetry using synthetic aperture imaging
… used to visualize flow fields, particle image velocimetry (PIV) offers great advantages because of the high resolution quantitative results it provides. The feasibility of using synthetic aperture (SA) imaging to conduct 3D Particle Image Velocimetry (PIV) has been previously demonstrated. This …
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Experimental investigation of the mixing of an axial jet within a swirling flow, utilizing laser Doppler velocimetry and particle image velocimetry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Iced Airfoil Separation Bubble Measurements by Particle Image Velocimetry
Previous iced airfoil investigations have demonstrated somewhat reduced aerodynamic penalties resulting from a three-dimensional ice simulation, compared to those of a two-dimensional ice simulation of a representative cross section. Correspondingly, the current measurements revealed accelerated …
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Inverse problems in fluid dynamics for magnetic resonance velocimetry
… fields from noisy and sparse magnetic resonance velocimetry signals. The method learns the most probable fluid dynamics model that fits the data by solving a Bayesian inverse Navier-Stokes boundary value problem. This jointly reconstructs and segments the velocity field, and at the same time …
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Improvements in fluidic device evaluation using particle image velocimetry
… medically relevant devices using particle image velocimetry (PIV). Medical devices can be particularly challenging to validate due to small length scales and complex geometries, which can reduce measurement accuracy by introducing noise and reducing available signal. Although the sources of such …
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Particle Image Velocimetry Applications of Fluorescent Dye-Doped Particles
… can often be a major issue in particle image velocimetry (PIV) involving solid boundaries in a flow or a gas-liquid interface. The use of fluorescent light from dye-doped particles has been demonstrated in water applications, but reproducing the technique in an airflow is more difficult due to …
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Investigation of turbulent boundary layer structure using particle image velocimetry
Particle-image velocimetry (PIV) is used to measure instantaneous velocity fields in the streamwise wall-normal plane of a zero-pressure-gradient turbulent boundary layer. In total, 340 PIV realizations of the boundary layer were obtained at Reynolds numbers based on momentum thickness of Ree = …
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Lagrangian dynamics of turbulence: Applications with 3D particle tracking velocimetry
… a customized three-dimensional Particle Tracking Velocimetry (3D-PTV) to explore the Lagrangian dynamics of selected turbulent problems. 3D-PTV is a quantitative flow measurement technique that aims to track the Lagrangian paths of a set of particles in three dimensions using stereoscopic imaging. …
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