Measurement of Temporal and Spatial Evolution of Transitional Pipe Flow with PIV
Turbulent ‘slugs’ were generated by injection of a small amount of fluid into a fully-developed laminar pipe flow at a Reynolds number of 5,800. Digital particle image velocimetry (PIV) was applied to measure the instantaneous flow field at different downstream locations with respect to the point of injection. At each location the passage of the turbulent slug could be recorded in a sequence of images. The results show the development in space and time of the turbulent slug as it progresses inside the pipe. For one location the consecutive PIV results were compiled into a single data set that represents a (quasi-) instantaneous cross section of the turbulent slug. From this data set it is possible to identify the flow structures that occur in the leading, central and trailing parts of the turbulent slug.
KeywordsParticle Image Velocimetry Pipe Flow Transition Turbulence
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- Draad, A. A. 1996. Laminar-turbulent transition in pipe flow for Newtonian and non-Newtonian fluids. Ph.D. thesis, Delft University of Technology.Google Scholar
- Draad, A.A., Kuiken, G.D.C., & Nieuwstadt, F.T.M. 1995. Transition to turbulence in pipe flow. Pages 103–110 of: et al., R. Kobayashi (ed), Proc. IUTAM Symp. "Laminar-Turbulent Transition".Google Scholar
- Westerweel, J. 1994. Efficient detection of spurious vectors in particle image velocimetry data sets. Exp. Fluids 16, 236–247.Google Scholar
- Westerweel, J., DRAAD, A.A., Van Der Hoeven, J. G. TH., & Van Oord, J. 1994. A fast data acquisition system for digital PIV: application to fully-developed and transitional turbulent pipe flow. In: Proc. 7th Int. Symp. on Applications of Laser Techniques to Fluid Mechanics. Google Scholar