Stereoscopic particle image velocimetry applied to liquid flows

Prasad, Ajay K.; Adrian, Ronald J.

doi:10.1007/bf00195595

Cited by 283 publications

(121 citation statements)

References 11 publications

(15 reference statements)

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“…The mapping function ðMÞ can for example be based on a camera pinhole model (Wieneke 2005), but other approaches have been proposed as well (Prasad 2000). The perspective image deformation can be corrected by a second-order polynomial that maps straight lines onto straight lines (Prasad 2000;Prasad and Adrian 1993;Westerweel and van Oord 2000). We used a third-order polynomial mapping function to account for additional aberrations by the round glass tube.…”

Section: Dewarpingmentioning

confidence: 99%

Measurement of laminar, transitional and turbulent pipe flow using Stereoscopic-PIV

2006

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Stereoscopic particle image velocimetry (SPIV) is applied to measure the instantaneous three component velocity field of pipe flow over the full circular cross-section of the pipe. The light sheet is oriented perpendicular to the main flow direction, and therefore the flow structures are advected through the measurement plane by the mean flow. Applying Taylor's hypothesis, the 3D flow field is reconstructed from the sequence of recorded vector fields. The large out-of-plane motion in this configuration puts a strong constraint on the recorded particle displacements, which limits the measurement accuracy. The light sheet thickness becomes an important parameter that determines the balance between the spatial resolution and signal to noise ratio. It is further demonstrated that so-called registration errors, which result from a small misalignment between the laser light sheet and the calibration target, easily become the predominant error in SPIV measurements. Measurements in laminar and turbulent pipe flow are compared to well established direct numerical simulations, and the accuracy of the instantaneous velocity vectors is found to be better than 1% of the mean axial velocity. This is sufficient to resolve the secondary flow patterns in transitional pipe flow, which are an order of magnitude smaller than the mean flow.

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Section: Dewarpingmentioning

confidence: 99%

Measurement of laminar, transitional and turbulent pipe flow using Stereoscopic-PIV

2006

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“…However, if we could make experiments simultaneously in many horizontal planes, the task were not tolerable to make. Before concluding this section, we will now introduce a new approach called stereoscopic PIV (see Prasad and Adrian (1993), Prasad and Jensen (1995), in addition, for the case of turning fish, see Sakakibara et al(2004)). This technique can be used to reconstruct a quasi three-dimensional flow field.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the Unsteady Mechanism in the Generation of Propulsive Force While Swimming Using a Synchronized Flow Visualization and Motion Analysis System

Matsuuchi¹,

Muramatsu²

2011

Biomechanics in Applications

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“…Images from at least two cameras are acquired. Then a stereo pair matching method is performed to determine the three-dimensional position of a fluid particle in the viewing volume under study (Kasagi & Nishino 1991;Maas et al 1993;Prasad & Adrian 1993;Costes et al 1994;Hassan et al 1998 Wernet (1993).…”

Section: Three-dimensional Particle Image Velocimetry and Tracking Almentioning

confidence: 99%

Full-Volume, Three-Dimensional, Transient Measurements of Bubbly Flows Using Particle Tracking Velocimetry and Shadow Image Velocimetry Coupled with Pattern Recognition Techniques

Hassan¹

2001

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This is the third phase report of the present NEER project. The overall goal, as d e s m i d in the initial report (report fbr phase l), was to develop a state-of-the-art; non-intrusive diagnostic tool to perform simultaneous measurements of both the temporal and threedimensional spatial velocity of the two phases of a bubbly flow. These measurements are required to provide a ikwndation for studying the constitutive closure relations needed in computational fluid dynamics and best-estimate thermal hydraulic codes employed in nuclear reactor safety analysis and severe accident simulation. Such kinds of I11-field measurements are not achievable through the commonly used point-measurement techniques, such as hot wire, conductance probe, laser Doppler anemometry, etc. The results c8fl also be used in several other applications, such as the dynamic transport of pollutants in water or studies of the dispersion of hazardous waste. A hybrid of the stereoscopic Particle Tracking Velocimetry (PTV) and the Shadow Image Velocimetry (SIV) flow measurement techniques was developed to provide threedimensional full-volume and transient velocity fields of the phases of a bubbly flow.This hybrid flow measurement technique was applied to provide us with the shape%d trajectory of a single air bubble rising in stagnant water, in a restricted medium. Pattern recognition algorithms were used to track the seed tracers embedded in the flow. These algorithms were proven to accurately describe the flow field in regions of low and high velocity gradients. Two tracking were used an Architecture Resonance Theory 2 Neural Network (ART2 NN) and the Spring Model (SM). The ART2 NN tracks tracer particles during h u r consecutive M e s , so it provides not only the velocity vector, but also the acceleration in a Lagrangian reference fiame. For regions of high velocity gradient, the SM was able to accurately track the tracer particles within two consecutive fkmes. These two pattern recognition-based algorithms were applied independently to the flow images. By combining the information fiom both tracking techniques, the fullvolume, three-dimensional velocity field was determined. The ART2 NN provided infbrmation of regions surrounding the rising bubble, while the SM descriied the flow in the bubble wake. The developed imaging and pattern recognition techniques used for this study can also be applied to medical imaging. 1In the Phase I report, a description of the constructed test hcility was presented. The camera calibration technique and a method to reduce refiaction problems were developed and presented. In addition, the PTV and SIV flow measurement techniques and tracking routines the ART2 NN and the SM were described and validated. During Phase n, the bubble shape and trajectory of the dispersed phase were obtained utilizing the developed state-of-the-art SIV technique. The wall influence on the shape and motion of the bubble was investigated. The magnitude and coefficients of the drag and lift forces acting on the bubble were also infenred fio...

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Stereoscopic particle image velocimetry applied to liquid flows

Cited by 283 publications

References 11 publications

Measurement of laminar, transitional and turbulent pipe flow using Stereoscopic-PIV

Measurement of laminar, transitional and turbulent pipe flow using Stereoscopic-PIV

Investigation of the Unsteady Mechanism in the Generation of Propulsive Force While Swimming Using a Synchronized Flow Visualization and Motion Analysis System

Full-Volume, Three-Dimensional, Transient Measurements of Bubbly Flows Using Particle Tracking Velocimetry and Shadow Image Velocimetry Coupled with Pattern Recognition Techniques

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