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Showing 1 to 20 of 39 for “"digital particle image velocimetry"”.
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Time-Resolved Analysis of Circulation Control over Supercritical Airfoil using Digital Particle Image Velocimetry (DPIV)
Active pneumatic flow control methods as applied to aerospace applications have shown noteworthy improvements in lift compared to traditional means. The General Aviation Circulation Control (GACC) concept currently under investigation at NASA's Langley Research Center (LaRC) is an attempt at …
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A Hybrid Dynamically Adaptive, Super-Spatio Temporal Resolution Digital Particle Image Velocimetry for Multi-Phase Flows
A unique, super spatio-temporal resolution Digital Particle Image Velocimetry (DPIV) system with capability of resolving velocities in a multi-phase flow field, using a very sophisticated novel Dynamically Adaptive Hybrid velocity evaluation algorithm has been developed The unique methodology of …
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Velocity field measurements of a jet confined to a swirling flow using digital particle image velocimetry cinematography
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Hemodynamic Flow Characterization of St. Jude Medical Bileaflet Mechanical and Bioprosthetic Heart Valve Prostheses in a Left Ventricular Model via Digital Particle Image Velocimetry
… most of which were obtained by Laser Doppler Velocimetry (LDV) in rigid models of the aorta. Digital Particle Image Velocimetry (DPIV) has also been utilized to reveal intricate patterns of interacting shed vortices downstream of the aortic valve. The orientation of the valves may considerably …
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Multiphase Hydrodynamics in Flotation Systems
… turbulence experiment was conducted to verify particle collision models. The slip velocities of solid particles and bubbles were measured using Digital Particle Image Velocimetry (DPIV). The experimental results were compared with the predictions from empirical and theoretical collision models. …
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Shear flow visualization at high Reynolds Numbers
… ship-fixed and tank fixed streak videography and Digital Particle Image Velocimetry (DPIV). In addition, the experimental apparatus was modified for similar flow visualization near live fish, and a description of this endeavor and its progress are included.
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The contribution of the pectoral fins, body, and the ribbon fin to turning maneuvers of a gymnotiform swimmer
… contributed to both small and large turns. Digital particle image velocimetry (DPIV) showed that the ribbon fin generates larger counter rotating vortices during turning than is produced during steady swimming. All three control surfaces contributed to steady swimming and large turns while …
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Experimental Investigations into Shark Skin Inspired Active Flow Control Mechanisms
… scales was studied experimentally using digital particle image velocimetry (DPIV).The flaps in this study had a rectangular shape and were designed with a protrusion heightin the bottom 10% of the boundary layer height, which is similar to that of the flexiblescales found on the mako …
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Experimental Investigation of the Effects of a Passing Shock on Compressor Stator Flow
… investigated using shadowgraph photography and Digital Particle Image Velocimetry (DPIV). Measurements were taken for three different shock strengths. In every case studied, a vortex formed near the stator trailing edge as the shock impacted the blade. The size of this vortex was shown to be …
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Development of Robust Correlation Algorithms for Image Velocimetry using Advanced Filtering
Digital Particle Image Velocimetry (DPIV) is a planar measurement technique to measure the velocity within a fluid by correlating the motion of flow tracers over a sequence of images recorded with a camera-laser system. Sophisticated digital processing algorithms are required to provide a high …
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An Investigation of Dolphin-Groove Inspired Surface Patterning on Flow Control
… skin friction drag penalty. Time-resolved digital particle image velocimetry (TR-DPIV) was used to track the development of the flow separation within the boundary layer and compared to the smooth plate (non-grooved) wall cases. The grooved surfaces form embedded vortices within the …
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Flame Studies on Conventional, Alternative, and Surrogate Jet Fuels, and Their Reference Hydrocarbons
… a twin-flame counterflow setup integrated with a Digital Particle Image Velocimetry system for the flow field measurement. The experimental results are also compared with computed values obtained by using various published kinetic models for different fuels. In general, most of the simulation …
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Robotics and power measurements of the RoboTuna
… an extensive system for dye visualization and digital particle image velocimetry, we did preliminary work characterizing the boundary layer of the swimming robot. We compare results gathered from the boundary layer of the swimming robot to the law of the wall and real fish swimming. We …
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Hydrodynamics of jumping in archer fish, Toxotes microlepis
… makes use of high speed backlight videos and image processing, while the hydrodynamic study relies on high speed digital particle image velocimetry (DPIV). The kinematic study is able to successfully break the jumping behavior into three parts: (1) hovering, (2) thrust production and (3) …
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Investigation of Particle Trajectories for Wall Bounded Turbulent Two-Phase Flows
… more than 40 years of research, operation with a particle-laden inlet flow remains a significant problem for modern turbomachines. The purpose, therefore, is to develop experimental methods for investigating multi-phase flows relevant to the cooling of gas turbine components. Initially, several …
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Wall shear measurements in arterial flows
… and wall shear stress (WSS) levels, as well as particle residence times. The relationship between these hemodynamic parameters and vascular injury response is of great relevance to understanding the cardiovascular disease process. In this work, new methods and algorithms are developed and …
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Wake Filling Techniques for Reducing Rotor-Stator Interaction Noise
… as a baseline for comparison for all data. Digital particle image velocimetry was performed for flow visualizations as well as velocity analysis in the wake region.
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A Comparative In Vitro Study of the Flow Characteristics Distal to Mechanical and Natural Mitral Valves
… employing a powerful, high-speed Time-Resolved Digital Particle Image Velocimetry (TRDPIV) system to map the flow field. We compare the flows downstream from a St. Jude Medical bileaflet MHV, a porcine mitral valve (MV), and a combination of both valves to simulate the technique of chordal …
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Mixing at Low Reynolds Numbers by Vibrating Cantilevered Ionic Polymers
… configurations of ionic polymers were tested and Digital Particle Image Velocimetry (DPIV) measurements were obtained. Resulting analysis using a quantitative mixing metric shows that using cantilevered polymers create increases mixing potential in the flow for some actuation cases. Although these …
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Turbulent Characteristics in Stirring Vessels: A Numerical Investigation
… CFD package) are compared with Time Resolved Digital Particle Image Velocimetry (DPIV) for baseline configurations in order to validate and verify the fidelity of the computations. Different turbulence models are used in this study in order to determine the most appropriate for the prediction …
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