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Experiments in Fluids

, Volume 40, Issue 6, pp 928–941 | Cite as

Particle image velocimetry studies of an incipient spot in the Blasius boundary layer

  • A. S. Banerjee
  • A. C. Mandal
  • J. DeyEmail author
Research Article

Abstract

Spatial evolution of a small amplitude localized disturbance introduced into the laminar boundary layer of a flat plate has been studied experimentally using the particle image velocimetry (PIV) technique. PIV data have been acquired in the spanwise and wall normal planes. Long and well defined high and low speed streaks are seen in the spanwise plane. The number of streaks are found to increase in the downstream direction. Breathing mode type oscillation of the boundary layer is observed. Associated with the streaks and akin to the bypass transition, ‘backward’ and ‘forward’ jet like structures of the fluctuating velocity components are observed.

Keywords

Particle Image Velocimetry Particle Image Velocimetry Measurement Laminar Boundary Layer Particle Image Velocimetry Data Turbulent Spot 
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.

Notes

Acknowledgments

The authors sincerely thank the Department of Science and Technology for funding the PIV unit through the FIST programme.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of Aerospace EngineeringIndian Institute of ScienceBangaloreIndia

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