Experiments in Fluids

, Volume 22, Issue 3, pp 199–211

A hybrid digital particle tracking velocimetry technique

  • E. A. Cowen
  • S. G. Monismith
  • E. A. Cowen
  • S. G. Monismith

DOI: 10.1007/s003480050038

Cite this article as:
Cowen, E., Monismith, S., Cowen, E. et al. Experiments in Fluids (1997) 22: 199. doi:10.1007/s003480050038

Abstract

A novel approach to digital particle tracking velocimetry (DPTV) based on cross-correlation digital particle image velocimetry (DPIV) is presented that eliminates the need to interpolate the randomly located velocity vectors (typical of tracking techniques) and results in significantly improved resolution and accuracy. In particular, this approach allows for the direct measurement of mean squared fluctuating gradients, and thus several important components of the turbulent dissipation. The effect of various parameters (seeding density, particle diameter, dynamic range, out-of-plane motion, and gradient strength) on accuracy for both DPTV and DPIV are investigated using a Monte Carlo simulation and optimal values are reported. Validation results are presented from the comparison of measurements by the DPTV technique in a turbulent flat plate boundary layer to laser Doppler anemometer (LDA) measurements in the same flow as well as direct numerical simulation (DNS) data. The DPIV analysis of the images used for the DPTV validation is included for comparison.

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • E. A. Cowen
    • 1
  • S. G. Monismith
    • 1
  • E. A. Cowen
    • 1
  • S. G. Monismith
    • 1
  1. 1.Environmental Fluid Mechanics Laboratory Stanford University, Stanford, CA 94305-4020, USAUS