Defocusing digital particle image velocimetry: a 3-component 3-dimensional DPIV measurement technique. Application to bubbly flows

Pereira, Francisco; Gharib, Morteza; Dabiri, Dana; Modarress, Darius

doi:10.1007/s003480070010

Cited by 168 publications

(112 citation statements)

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“…Using an instantaneous volumetric PIV system [21,24,25], we were able to capture series of complete three-dimensional snapshots of the wake structure produced by the heterocercal tails of freely swimming sharks. Four live sharks (mean total length ¼ 24.6 cm), two each of two species, spiny dogfish (Squalus acanthias; see electronic supplementary material) and chain dogfish (Scyliorhinus retifer) with trailing edge spans of 5 -6.5 cm and tail beat amplitudes of 6.5-7.5 cm swam at 0.5, 0.75 and 1.0 body lengths per second in a recirculating flow tank equipped with a volumetric PIV system that captured volumes of 14 Â 14 Â 10 cm 3 (x, y, z) at 7.25 Hz (TSI Inc., Shoreview, MN, USA).…”

Section: Methodsmentioning

confidence: 99%

“…The flow tank was seeded with 50 mm plastic particles that were suspended in flow. Particle position and displacements were calculated between laser pulses using V3V software as detailed in Troolin & Longmire [21] and Pereira et al [25]. In brief, the three lens and charge-coupled device (CCD) arrays (2048 Â 2048) were calibrated by traversing a known target across the transverse (Z) plane of the flow tank where the fish were to swim.…”

Section: Methodsmentioning

confidence: 99%

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Volumetric imaging of shark tail hydrodynamics reveals a three-dimensional dual-ring vortex wake structure

et al. 2011

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Understanding how moving organisms generate locomotor forces is fundamental to the analysis of aerodynamic and hydrodynamic flow patterns that are generated during body and appendage oscillation. In the past, this has been accomplished using two-dimensional planar techniques that require reconstruction of three-dimensional flow patterns. We have applied a new, fully three-dimensional, volumetric imaging technique that allows instantaneous capture of wake flow patterns, to a classic problem in functional vertebrate biology: the function of the asymmetrical (heterocercal) tail of swimming sharks to capture the vorticity field within the volume swept by the tail. These data were used to test a previous three-dimensional reconstruction of the shark vortex wake estimated from two-dimensional flow analyses, and show that the volumetric approach reveals a different vortex wake not previously reconstructed from two-dimensional slices. The hydrodynamic wake consists of one set of dual-linked vortex rings produced per half tail beat. In addition, we use a simple passive shark-tail model under robotic control to show that the three-dimensional wake flows of the robotic tail differ from the active tail motion of a live shark, suggesting that active control of kinematics and tail stiffness plays a substantial role in the production of wake vortical patterns.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Volumetric imaging of shark tail hydrodynamics reveals a three-dimensional dual-ring vortex wake structure

et al. 2011

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“…This method was proposed by Willert and Gharib (1992) and applied for macroscopic two phase flow by Pereira et al (2000) and Pereira and Gharib (2002). A theoretical examination of the underlying optics for macroscopic applications was presented by Dabiri (2005, 2008).…”

Section: Defocused Imaging With Aperture (Three-pinhole Technique)mentioning

confidence: 99%

Particle imaging techniques for volumetric three-component (3D3C) velocity measurements in microfluidics

Cierpka

Kähler

2011

J Vis

129

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The reliable measurement of the 3D3C velocity field in microfluidic devices becomes more and more important for future optimization and developments for lab-on-a-chip applications or point-of-care medical diagnosis systems. In the past years, different particle-based imaging methods, such as confocal scanning microscopy, holography, stereoscopic and tomographic imaging or approaches based on defocused particle images or optical aberrations have been developed and applied successfully to measure velocity fields in microfluidic systems. The benefits and drawbacks of these methods will be discussed in detail as the proper understanding of the measurement principle is essential to select the most appropriate technique for a desired measurement application. Once an imaging method is chosen, the velocity can be estimated by correlation-based methods or tracking approaches. The advantages and disadvantages of both methods and the importance of image preprocessing will also be discussed in detail.

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“…Defocusing digital particle image velocimetry has been applied to single-phase and bubbly flow [8]. Scanning-light-sheet PIV has been able to describe complex flow patterns in relatively low velocity flows [5].…”

Section: Introductionmentioning

confidence: 99%

A matching pursuit approach to solenoidal filtering of three-dimensional velocity measurements

Schiavazzi

Coletti

Iaccarino

et al. 2014

Journal of Computational Physics

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Methodologies to acquire three-dimensional velocity fields are becoming increasingly available, generating large datasets of steady state and transient flows of engineering and/or biomedical interest. This paper presents a novel linear filter for three-dimensional velocity acquisitions, which eliminates the spurious velocity divergence due to measurement errors. The noise reduction properties of the associated linear operator are discussed together with the treatment of boundary conditions. Examples show the application of the technique to real velocity fields acquired through volumetric Particle Image Velocimetry. The effectiveness of the filter is demonstrated by application to synthetic velocity fields obtained from analytical solutions and computations. The filter eliminates about half of the noise, without artificial smoothing of the original data, and conserves localized flow features.

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Defocusing digital particle image velocimetry: a 3-component 3-dimensional DPIV measurement technique. Application to bubbly flows

Cited by 168 publications

References 0 publications

Volumetric imaging of shark tail hydrodynamics reveals a three-dimensional dual-ring vortex wake structure

Volumetric imaging of shark tail hydrodynamics reveals a three-dimensional dual-ring vortex wake structure

Particle imaging techniques for volumetric three-component (3D3C) velocity measurements in microfluidics

A matching pursuit approach to solenoidal filtering of three-dimensional velocity measurements

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