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Showing 1 to 20 of 381 for “"Particle image velocimetry"”.
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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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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
… 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 turbulent flows/flames. However, three problems for this technique are: (a) it requires two lasers …
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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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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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Improvements in fluidic device evaluation using particle image velocimetry
… micro-scaled 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 …
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Particle Image Velocimetry Applications of Fluorescent Dye-Doped Particles
Laser flare 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 …
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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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An experimental study of turbulent vortex rings using particle image velocimetry
… studied using two-dimensional and Stereoscopic Particle Image Velocimetry. In the late 1980s’ a similarity theory of turbulent vortex rings was proposed and tested primarily using a twochannel tracking Laser Doppler Velocimeter. However, due to the limitations of the experimental technique the …
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Volumetric analysis of lamprey hydrodynamics using synthetic aperture particle image velocimetry
… lamprey hydrodynamics using Synthetic Aperture Particle Image Velocimetry (SAPIV) was developed and applied in this thesis. Volumetric, time-resolved flow field analysis of freely swimming lamprey, Petromyzon marinus, are presented from SAPIV experiments. As the most primitive living vertebrate, …
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Investigation of orthogonal blade-vortex interaction using a particle image velocimetry technique
… of Glasgow, with the flow interrogated using a Particle Image Velocimetry (PVI) technique. The PVI method allows global flowfield information to be obtained pertaining to the nature of the interaction. The methodology was benchmarked against synthetic flowfields, and with the accuracy of the …
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Volumetric analysis of fish swimming hydrodynamics using synthetic aperture particle image velocimetry
… Giant Danio (Danio aequipinnatus). Volumetric particle fields are reconstructed using synthetic aperture refocusing. The experiment is designed with minimal constraints on animal behavior to ensure that natural swimming occurs. Resultantly, the fish exhibits a variety of forward swimming and …
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Control of underactuated fluid-body systems with real-time particle image velocimetry
… problem, and have used computationally intensive Particle Image Velocimetry (PIV) to gain an understanding of the fluid behavior after the fact. However, improvement in available computational power is now making it possible to perform PIV in real-time. When PIV provides real-time awareness of the …
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Investigation of viscosity effects on bacteria collective motion using particle image velocimetry
… motion of swimming bacteria. In this paper, Particle Image Velocimetry (PIV), a commonly-used method to measure nonintrusive, instantaneous and whole-field velocity, is applied to visualize the swimming patterns and behavior of Escherichia coli and Vibrio alginolyticus. Firstly, various PIV …
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