Experiments in Fluids

, Volume 43, Issue 1, pp 125–133 | Cite as

Decaying turbulence in soap films: energy and enstrophy evolution

  • Tanveer Shakeel
  • Peter Vorobieff
Research Article


This experimental study of quasi-two-dimensional grid turbulence in gravity-driven soap-film flow focuses on the differences between the behavior of the flow and the theoretical picture of two-dimensional turbulence. A previously unattainable quality of velocity field acquisition facilitates simultaneous measurement of velocity field features in the scale range spanning over two orders of magnitude. The highly-resolved flow field data are analyzed statistically in terms of velocity structure functions, as well as energy and enstrophy averages at different downstream positions. We find the rate of decay of these averages to be quantifiably greater than the predictions of the two-dimensional turbulence theory. This increased decay is likely to be the manifestation of the extra dissipation mechanism present in soap-film flows and prominent on the larger scales—air drag. The structure function analysis confirms the notion.


Vorticity Digital Particle Image Velocimetry Downstream Distance Soap Film Grid Turbulence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringThe University of New MexicoAlbuquerqueUSA
  2. 2.Department of Mechanical EngineeringThe University of New MexicoAlbuquerqueUSA

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