The particles utilized in particle image velocimetry (PIV) form a biased dispersion near interfaces that, in turn, lead to biased velocity measurements. This lack of seeding in the high shear region of the flow always biases the velocity measurement high as the particles are, on average, towards the far end of an interrogation window (IW) — opposite of the wall. By observing the ensemble-averaged IW particle-dispersion centroid as the corrected measurement location against the industry standard of the geometric center of the IW, this paper puts forth a methodology to correct for the biased error in flow measurements very near the wall. A typical correction to the reported velocity measurement location within a wall layer flow was seen to be approximately 75% from the geometric center to the edge of an IW. This methodology can easily be implemented in any PIV code with the express purpose of removing a source of bias error that forms by reporting measurements at the geometric center of an IW.
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ASME 2015 International Mechanical Engineering Congress and Exposition
November 13–19, 2015
Houston, Texas, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5747-2
PROCEEDINGS PAPER
On Improvement of PIV Measurements in the High-Shear Layer of a Wall-Bounded Flow
Richard S. Skifton,
Richard S. Skifton
University of Idaho, Idaho Falls, ID
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Ralph S. Budwig
Ralph S. Budwig
University of Idaho, Boise, ID
Search for other works by this author on:
Richard S. Skifton
University of Idaho, Idaho Falls, ID
Ralph S. Budwig
University of Idaho, Boise, ID
Paper No:
IMECE2015-52840, V07BT09A046; 10 pages
Published Online:
March 7, 2016
Citation
Skifton, RS, & Budwig, RS. "On Improvement of PIV Measurements in the High-Shear Layer of a Wall-Bounded Flow." Proceedings of the ASME 2015 International Mechanical Engineering Congress and Exposition. Volume 7B: Fluids Engineering Systems and Technologies. Houston, Texas, USA. November 13–19, 2015. V07BT09A046. ASME. https://doi.org/10.1115/IMECE2015-52840
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