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Experiments in Fluids

, Volume 27, Issue 5, pp 414–419 | Cite as

PIV measurements of a microchannel flow

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

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.

Keywords

Particle Image Velocimetry Particle Image Velocimetry Measurement Particle Image Velocimetry System Recording Optic Plane Direction 
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 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

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