Experiments in Fluids

, Volume 27, Issue 5, pp 414–419

PIV measurements of a microchannel flow

  • C. D. Meinhart
  • S. T. Wereley
  • J. G. Santiago

DOI: 10.1007/s003480050366

Cite this article as:
Meinhart, C., Wereley, S. & Santiago, J. Experiments in Fluids (1999) 27: 414. doi:10.1007/s003480050366

Abstract

 A particle image velocimetry (PIV) system has been developed to measure velocity fields with order 1-μm spatial resolution. The technique uses 200 nm diameter flow-tracing particles, a pulsed Nd:YAG laser, an inverted epi-fluorescent microscope, and a cooled interline-transfer CCD camera to record high-resolution particle-image fields. The spatial resolution of the PIV technique is limited primarily by the diffraction-limited resolution of the recording optics. The accuracy of the PIV system was demonstrated by measuring the known flow field in a 30 μm×300 μm (nominal dimension) microchannel. The resulting velocity fields have a spatial resolution, defined by the size of the first window of the interrogation spot and out of plane resolution of 13.6 μm× 0.9 μm×1.8 μm, in the streamwise, wall-normal, and out of plane directions, respectively. By overlapping the interrogation spots by 50% to satisfy the Nyquist sampling criterion, a velocity-vector spacing of 450 nm in the wall-normal direction is achieved. These measurements are accurate to within 2% full-scale resolution, and are the highest spatially resolved PIV measurements published to date.

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • C. D. Meinhart
    • 1
  • S. T. Wereley
    • 1
  • J. G. Santiago
    • 2
  1. 1.Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106, USAUS
  2. 2.Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USAUS