PIVlab – Towards User-friendly, Affordable and Accurate Digital Particle Image Velocimetry in MATLAB
William Thielicke,Eize Stamhuis +1 more
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TLDR
The accuracy of several algorithms was determined and the best performing methods were implemented in a user-friendly open-source tool for performing DPIV flow analysis in Matlab.Abstract:
Digital particle image velocimetry (DPIV) is a non-intrusive analysis technique that is very popular for mapping flows quantitatively. To get accurate results, in particular in complex flow fields, a number of challenges have to be faced and solved: The quality of the flow measurements is affected by computational details such as image pre-conditioning, sub-pixel peak estimators, data validation procedures, interpolation algorithms and smoothing methods. The accuracy of several algorithms was determined and the best performing methods were implemented in a user-friendly open-source tool for performing DPIV flow analysis in Matlab.read more
Citations
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The microfluidic lighthouse: an omnidirectional gradient generator
TL;DR: The development of a simple radially symmetric microfluidics device that can deliver laminar flow in 360° and provide a high degree of freedom in the positioning and orientation of attractant gradients, and thus may serve as a versatile platform for studying cell migration, re-orientation, and steering.
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The dynamics of granular flow from a silo with two symmetric openings.
Luke Fullard,E. C. P. Breard,Clive E Davies,A. J. R. Godfrey,M. Fukuoka,A. Wade,Josef Dufek,Gert Lube +7 more
TL;DR: It is shown that inter-particle friction controls the flow rate behaviour and explains the discrepancies in the literature results.
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Mechanism of large-scale flow reversals in turbulent thermal convection
Yin Wang,Pik Yin Lai,Penger Tong +2 more
TL;DR: A new kind of convective instability for turbulent thermal convection is reported, in which the convective flow stays over a long steady “quiet period” having a minute amount of heat accumulation in the convection cell, followed by a short and intermittent “active period’ with a massive eruption of thermal plumes to release the accumulated heat.
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Straight-to-Curvilinear Motion Transition of a Swimming Droplet Caused by the Susceptibility to Fluctuations
TL;DR: In this article, a water-in-oil swimming droplet's transition from straight to curvilinear motion is investigated experimentally and theoretically, and it is shown that the motion transition depends on the susceptibility of the droplet direction of movement to external stimuli as a function of environmental parameters such as droplet size.
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Azimuthal instability of the radial thermocapillary flow around a hot bead trapped at the water-air interface
TL;DR: In this paper, the radial thermocapillary flow driven by a laser-heated microbead in partial wetting at the water-air interface is investigated and the evolution of the convective flow patterns surrounding the hot sphere as the latter is increasingly heated.
References
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The Design and Implementation of FFTW3
Matteo Frigo,Steven G. Johnson +1 more
TL;DR: It is shown that such an approach can yield an implementation of the discrete Fourier transform that is competitive with hand-optimized libraries, and the software structure that makes the current FFTW3 version flexible and adaptive is described.
Book
Particle Image Velocimetry: A Practical Guide
TL;DR: In this paper, the authors present a practical guide for the planning, performance and understanding of experiments employing the PIV technique, which is primarily intended for engineers, scientists and students, who already have some basic knowledge of fluid mechanics and nonintrusive optical measurement techniques.
Journal ArticleDOI
Particle-Imaging Techniques for Experimental Fluid Mechanics
TL;DR: A review of these methods can be found in articles by Lauterborn & Vogel (1984), Adrian (1986a), Hesselink (1988), and Dudderar et al..
Journal ArticleDOI
Adaptive histogram equalization and its variations
Stephen M. Pizer,Stephen M. Pizer,E. Philip Amburn,E. Philip Amburn,John D. Austin,Robert Cromartie,Ari Geselowitz,Ari Geselowitz,Trey Greer,Bart M. ter Haar Romeny,John B. Zimmerman,John B. Zimmerman +11 more
TL;DR: It is concluded that clipped ahe should become a method of choice in medical imaging and probably also in other areas of digital imaging, and that clip ahe can be made adequately fast to be routinely applied in the normal display sequence.
Journal ArticleDOI
Digital Particle Image Velocimetry
Christian Willert,Morteza Gharib +1 more
TL;DR: In this article, the directional ambiguity associated with PIV and LSV is resolved by implementing local spatial cross-correlations between two sequential single-exposed particle images, and the recovered velocity data are used to compute the spatial and temporal vorticity distribution and the circulation of the vortex ring.