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Showing 1 to 20 of 181 for “"particle image velocimetry (PIV)"”.
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Measurement and Analysis of Full-Scale Room Airflow Using Particle Image Velocimetry (Piv) Techniques
The measured quantitative velocity data can be used to evaluate ventilation equipment and system design by manufacturers, optimize performance of ventilation equipment and systems, optimize environment of animals in different ages and stages, and validate numeric models. This measurement method is …
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Uncertainties associated with the postprocessing of 2-D particle image velocimetry (PIV) velocity data of unsteady flow fields
Includes bibliographical references (pages 108-110).
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Development of experimental techniques and studies of spatial structure in turbulent thermal convection
Particle-image velocimetry (PIV), shadowgraph, and thermochroic liquid crystal techniques are applied to the study of spatial structure of turbulent thermal convection in wide horizontal water layers. A large-aspect-ratio test section for the study of turbulent Rayleigh convection in water has been …
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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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3D particle tracking velocimetry using synthetic aperture imaging
… currently 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 …
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Charakterisierung von Sprayflammen mittels abbildender Laserspektroskopie
… der Tropfen im Spray wurde mittels der Particle-Image-Velocimetry (PIV) bestimmt. Darüber hinaus wurde durch ein kombiniertes LIF-Streulicht- (Mie-Streuung) Verfahren der Sauterdurchmesser (SMD) des Sprays ermittelt.
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CHARACTERIZATION OF THE INITIAL SPRAY FROM A JET IN CROSSFLOW
… crossflow was conducted using Shadowgraphy and Particle Image Velocimetry (PIV) techniques. Momentum ratio and gas Weber number were varied to study their effects on the column trajectory, spray trajectory, breakup locations and spray characteristics after column breakup. Correlations for column …
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Inline motion in flapping foils for improved force vectoring performance
… improving locomotion and maneuvering. I employ Particle Image Velocimetry (PIV) to visualize the various wake patterns of these foil trajectories and a force transducer to evaluate their performance within a towing-tank experiment.
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Three-Dimensional Fluid Flow Measurement Techniques with Applications to Biological Flows
The accuracy of plenoptic and tomographic particle image velocimetry (PIV) experimental methods is measured by simulating three-dimensional flows and measuring the errors in the estimated versus true velocity fields. Parametric studies investigate the accuracy of these methods by simulating a range …
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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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Development and Application of Particle Image Velocimetry in High-Speed Separated Flow: Two-Dimensional Base Cavities
A new particle image velocimetry (PIV) system has been developed to obtain two-dimensional instantaneous velocity data over a planar region in high-speed separated flows for the quantitative analysis of turbulent and unsteady flow structures. This PIV system is the first of its type to incorporate …
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Experimental studies of shear stress and flow separation in low Reynolds number flows
… with the sensor is compared to that derived from particle image velocimetry (PIV) velocity profiles, and the resulting discrepancy between the two measurements is discussed.
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Roughness Effects on Super Structures in Turbulent Boundary Layer Flows
… layers, using wall-parallel stereoscopic Particle Image Velocimetry (PIV) at a Reynolds number of 1.3 × 106m−1. The data was collected at a distance of = 2.8 from the wall under adverse = 0.98, small = −0.04, and favorable = −0.60 pressure conditions. It was observed that coherent …
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Experimental investigation of 2D and 3D internal wave fields
… is extensively studied via planarand stereo- Particle Image Velocimetry (PIV) flow field measurement techniques. A benchmark was provided by an experiment involving tidal flow over a 2D Gaussian ridge; this study providing a counterpart with which studies of a 3D incised Gaussian ridge could …
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Development of a test section featuring a flat plate conditioned for the study of fully developed turbulent boundary layers using PIV
… layers in wall-bounded flow, primarily using Particle Image Velocimetry (PIV). The initial section will focus on providing motivation of why it can be of interest to study turbulence. The following section will provide a historical context of the development of the Navier-Stokes equations …
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Experimental investigation of small-scale breaking waves : flow visualization across the air-water interface
… piercing wave probes, high speed video, and Particle Image Velocimetry (PIV).
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Performance of biologically inspired flapping foils
… Next, the wake was studied quantitatively using particle image velocimetry (PIV). Through this technique, numerical thrust coefficients and vorticity strengths were obtained as well as qualitative information regarding the morphology of the wake. The coefficient of thrust peaked at a different …
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Internal Fluid Dynamics and Frequency Characteristics of Feedback-Free Fluidic Oscillators
… was extracted using a refractive index-matched Particle Image Velocimetry (PIV) technique with the help of a PIV phase averaging method and a new sensor setup for simultaneous frequency measurements in refractive index matching fluid. Three different operating regimes (low flow rate, transition …
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Form, function and flow in the plankton : jet propulsion and filtration by pelagic tunicates
… and swimming styles were compared. Small-scale particle encounter at the salp filtering apparatus was also explored. Observations and experiments were conducted at the Liquid Jungle Lab, off the pacific coast of Panama in January 2006 through 2009. First, time-varying body volume was calculated …
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