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Velocity-Field Measurements in a Fluid Boundary Layer Based on High-Speed Thermography

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Abstract

A new method of visualization of the flow-velocity fields within a boundary layer of a nonisothermal fluid using seedless velocimetry is proposed. The method is based on the high-speed thermographic detection of the dynamics of temperature inhomogeneities acting as a passive flow tracer through an infrared-transparent wall. As a result of thermal image post-processing using a cross-correlation algorithm, the fields of velocity of near-wall flow formed in the region of interaction between the submerged impinging water jet and the impinged surface are investigated in the range from 0 to 1 m/s, and the location of the laminar–turbulent transition inside the boundary layer are determined.

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Funding

This study was supported by the Russian Science Foundation, grant no. 19-79-00162.

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    E. Yu. Koroteeva, I. A. Znamenskaya & P. A. Ryazanov

Authors
  1. E. Yu. Koroteeva
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  2. I. A. Znamenskaya
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  3. P. A. Ryazanov
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Corresponding author

Correspondence to E. Yu. Koroteeva.

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Translated by V. Bukhanov

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Koroteeva, E.Y., Znamenskaya, I.A. & Ryazanov, P.A. Velocity-Field Measurements in a Fluid Boundary Layer Based on High-Speed Thermography. Dokl. Phys. 65, 100–102 (2020). https://doi.org/10.1134/S1028335820030088

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  • DOI: https://doi.org/10.1134/S1028335820030088

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