Journal ArticleDOI
Twenty years of particle image velocimetry
TLDR
The development of the method of particle image velocimetry (PIV) is traced by describing some of the milestones that have enabled new and/or better measurements to be made.Abstract:
The development of the method of particle image velocimetry (PIV) is traced by describing some of the milestones that have enabled new and/or better measurements to be made. The current status of PIV is summarized, and some goals for future advances are addressed.read more
Citations
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Posted Content
Error propagation dynamics of PIV-based pressure field calculation (3): What is the minimum resolvable pressure in a reconstructed field?
TL;DR: An analytical framework for the propagation of velocity errors into PIV-based pressure calculation is extended in this paper, where the optimal spatial resolution and the corresponding minimum field-wide error level in the calculated pressure field are determined This minimum error is viewed as the smallest resolvable pressure.
Journal ArticleDOI
A mechanism for mitigation of blade–vortex interaction using leading edge blowing flow control
Chris Weiland,Pavlos P. Vlachos +1 more
TL;DR: In this paper, a leading edge blowing (LEBOW) active flow control was used to minimize the parallel blade-vortex interaction (BVI) by displacing an incident vortex using a jet issued from the leading edge of a sharp airfoil, effectively increasing the standoff distance of the vortex from the body.
Journal ArticleDOI
Direct observation of single- and two-phase flows in spacer filled membrane modules
TL;DR: In this paper, transparent modules with precise slit accommodating for spacer were fabricated to visualize the behavior of single and two-phase flows, and the critical Reynolds number was found to decrease from 1000 to 100 approximately.
Journal ArticleDOI
Nanoparticle tracking velocimetry by observing light scattering from individual particles
TL;DR: The NPTV method developed in this study can be utilized for various liquid samples owing to non-limited variety of nano-sized tracer materials and could play an important role in the flow velocity measurement in the design of nanoscale/microscale reaction/mixing channel processes.
Journal ArticleDOI
Life cycle of streaks in the buffer layer of wall-bounded turbulence
H. Jane Bae,Myoungkyu Lee +1 more
TL;DR: In this article, the life cycle of streaks in the buffer layer of wall-bounded turbulence is identified by tracking the time evolution of individual streaks, and it is shown that streaks are born in a buffer layer, coalescing with each other to create larger streaks that are still attached to the wall, eventually splitting into wall-attached and wall-detached components, disintegrating further until they dissipate into the turbulent background.
References
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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
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.
Book ChapterDOI
Particle Image Velocimetry
TL;DR: In this paper, the authors use hot-wire (HW) or laser velocimetry (LV) to estimate the velocity, vorticity, and pressure fields of wake flows.
Journal ArticleDOI
Determination of displacements using an improved digital correlation method
TL;DR: An improved digital correlation method is presented for obtaining the full-field in-plane deformations of an object by numerically correlating a selected subset from the digitized intensity pattern of the undeformed object.
Journal ArticleDOI
Fundamentals of digital particle image velocimetry
TL;DR: In this paper, the measurement principle of digital particle image velocimetry (PIV) is described in terms of linear system theory and conditions for PIV correlation analysis as a valid interrogation method are determined.