Particle Image Velocimetry Measurements of Bed-Shear Stress Induced By Wall-Bounded Swirling Jets

2020 ◽  
Vol 146 (6) ◽  
pp. 04020052 ◽  
Author(s):  
Maoxing Wei ◽  
Yee-Meng Chiew ◽  
Nian-Sheng Cheng
Keyword(s):  
Shear Stress ◽  
Particle Image Velocimetry ◽  
Particle Image ◽  
Bed Shear Stress ◽  
Swirling Jets ◽  
Image Velocimetry

scholarly journals The PIV study of air flow past the counter-swirler 53983

2018 ◽  
Vol 168 ◽  
pp. 05004 ◽  
Author(s):  
Daniel Duda
Keyword(s):  
Reynolds Number ◽  
Particle Image Velocimetry ◽  
Shear Layer ◽  
Particle Image ◽  
Contact Region ◽  
Air Flow ◽  
Swirling Jets ◽  
Flow Past ◽  
Image Velocimetry ◽  
Band Pass

PIV (particle image velocimetry) measurement of the air flow past a counter-swirler 53983 (anticlockwise swirler surrounded by clockwise swirler) is performed. The measurement is focused to an area at the boundary between the inner swirling jet and the outer one rotating oppositely. The Reynolds number Re based on the inner swirler diameter ranged form 1.2·103 to 2.1·104. By using band pass filtering the shear layer and vortices in the contact region between counter-swirling jets is highlighted. The shear layer between these regions shortens and decays into vortices as Reynolds number increases.

Accounting for Differences Between Echo Particle Image Velocimetry (EPIV) and Pulse Wave Doppler (PWD) Velocity Measurements

2009 ◽  
Author(s):  
Andrew M. Walker ◽  
Clifton R. Johnston ◽  
Gary M. Dobson
Keyword(s):  
Shear Stress ◽  
Particle Image Velocimetry ◽  
Particle Image ◽  
Pulse Wave ◽  
Velocity Measurements ◽  
Image Velocimetry ◽  
University Of Calgary ◽  
Beam Thickness ◽  
The University

Currently, an echo particle image velocimetry (ePIV) system for the investigation of in vivo blood flow and shear stress is under development at the University of Calgary. To date, encouraging preliminary results have been obtained when comparing ePIV derived velocities to analytical solutions. However, large discrepancies were noted between our steady state ePIV derived velocities and velocities measured using pulse wave Doppler (PWD). Ultrasound beam thickness, off axis centerline measurements and PWD angle of interrogation likely account for the differences observed.

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