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How to find patterns written in turbulent air

How to find patterns written in turbulent air In molecular tagging velocimetry, patterns of tagged molecules are written in a flow using lasers. They can be lines, crosses or grids. When time proceeds, these patterns are deformed and displaced by the flow. The patterns are followed in time, and from their deformation and displacement, the velocity field can be deduced. In strongly turbulent flow, written lines may be severely deformed or even ruptured, and then, it becomes a challenge to find them in images. We discuss the technique of active contours to trace deformed lines and crosses in turbulence. These patterns can be used to measure the statistical properties of the flow. We illustrate our technique using a variant of molecular tagging in a turbulent flow of air in which NO molecules are formed from N2 and O2 using UV laser beams. A short while later, these patterns are visualized by inducing fluorescence of the NO molecules. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

How to find patterns written in turbulent air

Water, Willem; Dam, Nico
Experiments in Fluids , Volume 54 (9) – Aug 31, 2013
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References (22)

Publisher
Springer Journals
Copyright
Copyright © 2013 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
DOI
10.1007/s00348-013-1574-7
Publisher site
See Article on Publisher Site

Abstract

In molecular tagging velocimetry, patterns of tagged molecules are written in a flow using lasers. They can be lines, crosses or grids. When time proceeds, these patterns are deformed and displaced by the flow. The patterns are followed in time, and from their deformation and displacement, the velocity field can be deduced. In strongly turbulent flow, written lines may be severely deformed or even ruptured, and then, it becomes a challenge to find them in images. We discuss the technique of active contours to trace deformed lines and crosses in turbulence. These patterns can be used to measure the statistical properties of the flow. We illustrate our technique using a variant of molecular tagging in a turbulent flow of air in which NO molecules are formed from N2 and O2 using UV laser beams. A short while later, these patterns are visualized by inducing fluorescence of the NO molecules.

Journal

Experiments in Fluids – Springer Journals

Published: Aug 31, 2013

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