Particle image velocimetry (PIV) was used to measure instantaneous and average particle velocity fields near the stagnation zone of a particle-laden impinging air jet. The results were compared with Lagrangian particle tracking measurements. Ensemble averages from the two methods agree well except in regions where particles have different histories, and a specific trajectory is dominant but not exclusive. The PIV autocorrelation method loses information regarding non-dominant particle trajectories. Thus, although instantaneous PIV measurements yield the dominant particle velocities correctly, the averaged measurements are biased in some regions.
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This work was supported by the Electric Power Research Institute under Contract RP 8034-01. We thank the 3M Corporation for their generous materials support.
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Anderson, S.L., Longmire, E.K. Interpretation of PIV autocorrelation mesurements in complex particle-laden flows. Experiments in Fluids 20, 314–317 (1996). https://doi.org/10.1007/BF00192676
- Particle Image Velocimetry
- Particle Velocity
- Particle Tracking
- Particle Image Velocimetry Measurement
- Stagnation Zone