Application of particle image velocimetry and proper orthogonal decomposition to the study of a jet in a counterflow

Application of particle image velocimetry and proper orthogonal decomposition to the study of a... Particle image velocimetry (PIV) experiments were carried out on a round jet in a uniform counterflow. The complex dynamics of this flow has so far hindered its understanding, and PIV appears to be a promising investigation method to help fill this gap. In fact PIV allows the dynamics of single vorticity structures to be followed, at least within the limits of its spatial and temporal resolution. In particular, the combination of PIV and proper orthogonal decomposition (POD) analysis showed that it is possible to isolate a few typical patterns out of the apparently chaotic fluctuations of the jet. A POD analysis at high velocity ratios was performed to investigate the fluctuations typical of the far field of the jet, while one at the critical velocity ratio of 1.3 delivered further information on the transition between the stable and the unstable flow condition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Application of particle image velocimetry and proper orthogonal decomposition to the study of a jet in a counterflow

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Publisher
Springer-Verlag
Copyright
Copyright © 2000 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s003480070029
Publisher site
See Article on Publisher Site

Abstract

Particle image velocimetry (PIV) experiments were carried out on a round jet in a uniform counterflow. The complex dynamics of this flow has so far hindered its understanding, and PIV appears to be a promising investigation method to help fill this gap. In fact PIV allows the dynamics of single vorticity structures to be followed, at least within the limits of its spatial and temporal resolution. In particular, the combination of PIV and proper orthogonal decomposition (POD) analysis showed that it is possible to isolate a few typical patterns out of the apparently chaotic fluctuations of the jet. A POD analysis at high velocity ratios was performed to investigate the fluctuations typical of the far field of the jet, while one at the critical velocity ratio of 1.3 delivered further information on the transition between the stable and the unstable flow condition.

Journal

Experiments in FluidsSpringer Journals

Published: Dec 31, 2000

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