Particle-Imaging Techniques for Experimental Fluid Mechanics

Adrian, Ronald J.

doi:10.1146/annurev.fl.23.010191.001401

Cited by 2,797 publications

(890 citation statements)

References 57 publications

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“…In recent years, due to advances in computers, optics, and digital image processing techniques, it has become possible to combine a conventional particle image velocimetry (PIV) system (Adrian 1991, Raffael et al 1998) with an inverted epifluorescent microscope (Santiago et al 1998, Koutsiaris et al 1999. As a result, this combination, known as a micro-PIV, has greatly increased the resolution of conventional PIV.…”

Section: Introductionmentioning

confidence: 99%

In vitro blood flow in a rectangular PDMS microchannel: experimental observations using a confocal micro-PIV system

Lima

Wada

Tanaka

et al. 2007

Biomed Microdevices

178

132

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Section: Introductionmentioning

confidence: 99%

In vitro blood flow in a rectangular PDMS microchannel: experimental observations using a confocal micro-PIV system

Lima

Wada

Tanaka

et al. 2007

Biomed Microdevices

178

132

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“…The arrows are the representation of a crosscorrelation between each window of the image with their expression in another moment. The plotted arrow regarding the cross-correlation of the all particles within each window is therefore a summary as a mean value of length and direction (Adrian, 1991). In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, PIV and LSV can only be distinguished by the so called source density, which means the amount of particles in the same place. In a speckle pattern, one has a high density of particles, characterizing the LSV approach, while the low density of particles are commonly linked to the PIV applications in fluids measurements (Adrian, 1991;Volker et alli, 2011;Ertürk et alli, 2013;Xu and Chen, 2013).…”

Section: Introductionmentioning

confidence: 99%

Maps of deformations in a cantilever beam using particle image velocimetry (PIV) and speckle patterns

Braga

Magalhães

Melo

et al. 2015

Rem: Rev. Esc. Minas

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PIV (particle image velocimetry) has been spreading in studies that use the movement of particles to monitor the displacement of an object or the flow of a fluid by means of velocity vectors using optical techniques and second order statistics. PIV is also known as laser speckle velocimetry when associated with speckle patterns. This technique has been used in works involving fluids, in general, building a map of velocity vectors representing the flow under analysis. This paper presents an approach by using PIV associated to speckle patterns for deformation measurements in a cantilever beam (ASTM A36 steel), one of the most common examples used in civil engineering, without the introduction of external particles. Results showed that the difference between PIV associated to speckle patterns and the analytic displacement values is increased along the beam length for a load of 1.96 N as an evidence of sensitivity of the proposed measurement method. This indicates that PIV is also capable for detecting displacement fields associated with laser speckle patterns in solid mechanics generating a map of deformation as an additional option for non-destructive tests.

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“…This makes them unsuitable for the transient (on a time scale of a few seconds), spatially varied surfaces of flows over evolving bedforms. Imaging techniques, by contrast, permit non-intrusive, fast whole-field measurements (a review of velocimetric methods is given in [5]). In the present work, two distinct methods have been developed for the rapid profiling of a highly varied water surface.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional reconstruction of the oscillatory free-surfaces of a flow over antidunes: stereoscopic and velocimetric techniques

Douxchamps

Devriendt²,

Capart³

et al.

OCEANS 2000 MTS/IEEE Conference and Exhibition. Conference Proceedings (Cat. No.00CH37158)

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We present imaging methods developed to characterize the oscillatory free-surface of rapid flows and apply them to torrential currents propagating over sediment antidunes. The aim is to obtain high-resolution relief maps of the free-surface topography, in order to highlight the regular spatial patterns associated with the bedforms. Two measurement principles are outlined and tested, both based on the imaging of floating tracers dispersed on the rapidly flowing surface. The first relies on direct stereoscopic measurements obtained using two cameras, while the second exploits an original velocimetric principle allowing to derive elevation from the velocity field acquired using a single camera. The measurement procedures and image analysis algorithms are introduced for the two methods, along with the physical assumptions underlying the velocimetric principle. The results of the two techniques are compared for different free-surface patterns and good correspondence is obtained. The obtained relief maps vividly depict the variety of motifs that can evolve as a result of interaction between shallow flows and loose sediment beds.

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Particle-Imaging Techniques for Experimental Fluid Mechanics

Cited by 2,797 publications

References 57 publications

In vitro blood flow in a rectangular PDMS microchannel: experimental observations using a confocal micro-PIV system

In vitro blood flow in a rectangular PDMS microchannel: experimental observations using a confocal micro-PIV system

Maps of deformations in a cantilever beam using particle image velocimetry (PIV) and speckle patterns

Three-dimensional reconstruction of the oscillatory free-surfaces of a flow over antidunes: stereoscopic and velocimetric techniques

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