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Single Pixel Evaluation of Microchannel Flows

[+] Author Affiliations
Steve Wereley, Arjun Sud

Purdue University

Carl Meinhart

University of California at Santa Barbara

Lichuan Gui

University of Mississippi

Derek Tretheway

Portland State University

Paper No. IMECE2005-83065, pp. 375-380; 6 pages
doi:10.1115/IMECE2005-83065
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Fluids Engineering
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4219-3 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

Recently a new μPIV interrogation algorithm has been proposed in which the interrogation window size is reduced to a single pixel. Such small interrogation window sizes are possible using correlation averaging to increase the effective particle concentration to levels required for correlation analysis to succeed. The random error exhibits the expected behavior of decreasing roughly in proportion to N−1/2 while the bias error exhibits unexpected peak-locking behavior with zero bias error at integer and half integer pixel displacements and maximal errors at one-quarter and three-quarter pixel displacements. Accompanying experiments show the potential of this technique but have not yet been sufficiently refined to confirm this unexpected bias error behavior.

Copyright © 2005 by ASME

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