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Experiments in Fluids

, Volume 30, Issue 4, pp 365–370 | Cite as

Effects of coincidence window and measuring volume size on laser Doppler velocimetry measurement of turbulence

  • S. Kang
  • B. Patil
  • R. P. Roy

Abstract

The effects of coincidence window and measuring volume size on two-component laser velocimeter measurement of turbulence in an isothermal liquid flow through a concentric annular channel were studied. Three different coincidence windows (100–500 μs) and three different measuring volume sizes (diameter, 5–9 wall units; spanwise length, 24–91 wall units) were used in a flow of Reynolds number 31,500 and data density spanning the high end of intermediate to the low end of high (3–6). While no significant effects of the coincidence window and measuring volume size were found on the time-mean velocity and turbulence intensities, the streamwise Reynolds shear stress measured near a wall was found to be markedly affected by both. The smallest feasible measuring volume along with an appropriate coincidence window provides good measurement of the shear stress.

Keywords

Shear Stress Reynolds Number Turbulence Intensity Velocimetry Reynolds Shear Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • S. Kang
    • 1
  • B. Patil
    • 1
  • R. P. Roy
    • 1
  1. 1.Arizona State University, Department of Mechanical and Aerospace Engineering, Tempe, AZ 85287-6106, USAUS

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