Boundary-layer structure in the flow around the cellular surface in a flat channel

Abstract

The results of experimental study of the turbulent flow structure at longitudinal flow around the cellular surface with hexagonal cells of 5-mm size, 21-mm depth and wall thickness of 0.2 mm are presented. The measurements were performed using the PIV system for the developed flow in the channel with cross section of 21×150 mm and length of 1000 mm. Stroboscopic visualization of the flow was performed, and velocity and turbulence components were measured in the channel with and without the cells. It is shown that in a vicinity of cells, the boundary layer is less filled, but it has the higher level of turbulent fluctuations. It is noted that in contrast to the profile on a smooth wall there is no logarithmic region on the cellular surface. In this case, there are no effects of velocity slip on the cellular surface under the experimental conditions.

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Correspondence to V. I. Terekhov.

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The work was financially supported by the Russian Science Foundation (Grant No. 14-19-00402).

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Terekhov, V.I., Smulsky, Y.I., Sharov, K.A. et al. Boundary-layer structure in the flow around the cellular surface in a flat channel. Thermophys. Aeromech. 21, 701–706 (2014). https://doi.org/10.1134/S0869864314060043

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Key words

  • boundary layer
  • cellular surface
  • turbulence
  • method of digital tracer visualization
  • tracers
  • hexagonal cells