The Measurement of Turbulent Structure Using PIV
Particle Image Velocimetry (PIV) is an optical technique for obtaining a spatial record of the velocities, at a point in time in a plane of a flow (Adrian, 1991). The application of PIV to turbulent flows is problematical due to the relatively large dynamic range of velocities and the 180° directional ambiguity inherent in the analysis using autocorrelation techniques. The use of image shifting overcomes these difficulties in essence, although the measurement of turbulent structures is still non-trivial. The values chosen for experimental parameters such as image-shift velocity, exposure, scan rate and seeding particle density affect the range of turbulent eddies that are resolved.
KeywordsParticle Image Velocimetry Break Water Large Dynamic Range Integral Length Scale Integral Time Scale
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