New fundamental measurements are presented for the transition process in flat plate boundary layers downstream of two-dimensional square ribs. By use of laser Doppler anemometry (LDA) and a large Matched-Index-of-Refraction (MIR) flow system, data for wall-normal fluctuations and Reynolds stresses were obtained in the near wall region to in addition to the usual mean streamwise velocity component and its fluctuation. By varying velocity and rib height, the experiment investigated the following range of conditions: to 21, Consequently, results covered boundary layers which retained their laminar characteristics through those where a turbulent boundary layer was established shortly after reattachment beyond the forcing rib. For “large” elements, evolution of turbulent statistics of the viscous layer for a turbulent boundary layer was rapid even in flows where the mean velocity profile still showed laminar behavior.
LDA-Measurements of Transitional Flows Induced by a Square Rib
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division October 4, 2000; revised manuscript received August 8, 2001. Associate Editor: D. R. Williams.
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Becker, S., Stoots, C. M., Condie, K. G., Durst, F., and McEligot, D. M. (August 8, 2001). "LDA-Measurements of Transitional Flows Induced by a Square Rib ." ASME. J. Fluids Eng. March 2002; 124(1): 108–117. https://doi.org/10.1115/1.1446067
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