A PIV algorithm is presented for estimating time-averaged or phase-averaged velocity fields. The algorithm can be applied to situations where signal strength is not sufficient for standard cross correlation techniques, such as a low number of particle images in an interrogation spot, or poor image quality. The algorithm can also be used to increase the spatial resolution of measurements by allowing smaller interrogation spots than those required for standard cross correlation techniques. The quality of the velocity measurements can be dramatically increased by averaging a series of instantaneous correlation functions, before determining the location of the signal peak, as opposed to the commonly used technique of estimating instantaneous velocity fields first and then averaging the velocity fields. The algorithm is applied to a microchannel flow. [S0098-2202(00)00602-7]
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June 2000
Technical Papers
A PIV Algorithm for Estimating Time-Averaged Velocity Fields
Carl D. Meinhart, Assistant Professor,,
Carl D. Meinhart, Assistant Professor,
Department of Mechanical & Environmental Engineering, University of California, Santa Barbara, CA 93106
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Steve T. Wereley, Assistant Professor,,
Steve T. Wereley, Assistant Professor,
Mechanical Engineering, Purdue University, 1288 Mechanical Engineering Building, West Lafayette, IN 47909-1288
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Juan G. Santiago, Assistant Professor,
Juan G. Santiago, Assistant Professor,
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-3030
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Carl D. Meinhart, Assistant Professor,
Department of Mechanical & Environmental Engineering, University of California, Santa Barbara, CA 93106
Steve T. Wereley, Assistant Professor,
Mechanical Engineering, Purdue University, 1288 Mechanical Engineering Building, West Lafayette, IN 47909-1288
Juan G. Santiago, Assistant Professor,
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-3030
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division May 17, 1999; revised manuscript received February 2, 2000. Associate Technical Editor: S. Banerjee.
J. Fluids Eng. Jun 2000, 122(2): 285-289 (5 pages)
Published Online: February 2, 2000
Article history
Received:
May 17, 1999
Revised:
February 2, 2000
Citation
Meinhart, C. D., Wereley, S. T., and Santiago, J. G. (February 2, 2000). "A PIV Algorithm for Estimating Time-Averaged Velocity Fields ." ASME. J. Fluids Eng. June 2000; 122(2): 285–289. https://doi.org/10.1115/1.483256
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