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
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Microdroplets nucleation by dissolution of a multicomponent drop in a host liquid
Huanshu Tan,Christian Diddens,Ali Akash Mohammed,Junyi Li,Michel Versluis,Xuehua Zhang,Detlef Lohse +6 more
TL;DR: In this article, a one-dimensional multiphase and multicomponent diffusion model in combination with thermodynamical equilibrium theory is proposed to predict the behavior of spontaneous emulsification, that is triggered by diffusion.
Journal ArticleDOI
The effect of slab gaps on subduction dynamics and mantle upwelling
Ágnes Király,D. E. Portner,D. E. Portner,K. L. Haynie,K. L. Haynie,Benjamin H. Chilson-Parks,Tithi Ghosh,Margarete A. Jadamec,Anna Makushkina,Michael Manga,Louis Moresi,Louis Moresi,Keely O'Farrell +12 more
TL;DR: In this article, the authors examined the dynamics of slab gap-altered mantle flow, its effects on trench morphology and kinematics, or the controlling parameters on these processes and found that both the vertical extent and the depth of the top (trailing edge) of the slab gap are crucial parameters for modulating overall subduction dynamics.
Journal ArticleDOI
Effect of a surface tension gradient on the slip flow along a superhydrophobic air-water interface
Dong Song,Dong Song,Dong Song,Baowei Song,Haibao Hu,Xiaosong Du,Peng Du,Chang-Hwan Choi,Jonathan P. Rothstein +8 more
TL;DR: The presence of a surface tension gradient is demonstrated at the air-water interface supported above a millimeter-sized discontinuous groove as mentioned in this paper, which reduces the slip velocity and in some cases results in an interfacial velocity that is opposite to the main flow direction.
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Adjoint-based pressure determination from PIV data in compressible flows — Validation and assessment based on synthetic data
Mathias Lemke,Jörn Sesterhenn +1 more
TL;DR: An adjoint-based technique making neither incompressibility or adiabatic flow is proposed, and the result is a consistent solution for the full Navier–Stokes equations.
Journal ArticleDOI
Early turbulence and pulsatile flows enhance diodicity of Tesla's macrofluidic valve.
TL;DR: Nguyen et al. as discussed by the authors showed that diodicity turns on abruptly at Reynolds number ≥ 200 and is accompanied by nonlinear pressure-flux scaling and flow instabilities, suggesting a laminar-to-turbulent transition that is triggered at unusually low Reynolds numbers.
References
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Journal ArticleDOI
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.