Hot-wire measurements of the spanwise vorticity fluctuation ω z have been carried out in a turbulent boundary layer subjected to concentrated suction, applied through a porous wall strip. The results indicate that, relative to the no-suction case, the rms value of ω z is significantly reduced in the near-wall region, with this reduction increasing with the suction rate σ. The reduction near the wall suggests an alteration in the dynamics of the layer. As the Reynolds number increases, the dynamics of the layer in the near-wall region become more intense and suction becomes less effective.
Experiments in Fluids – Springer Journals
Published: May 24, 2005
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