Particle image velocimetry

Particle image velocimetry (PIV) is an optical method of flow visualization used in education and research. It is used to obtain instantaneous velocity measurements and related properties in fluids. The fluid is seeded with tracer particles which, for sufficiently small particles, are assumed to faithfully follow the flow dynamics (the degree to which the particles faithfully follow the flow is represented by the Stokes number). The fluid with entrained particles is illuminated so that particles are visible. The motion of the seeding particles is used to calculate speed and direction (the velocity field) of the flow being studied. Other techniques used to measure flows are laser Doppler velocimetry and hot-wire anemometry. The main difference between PIV and those techniques is that PIV produces two-dimensional or even three-dimensional vector fields, while the other techniques measure the velocity at a point. During PIV, the particle concentration is such that it is possible to i

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Application of a particle image velocimetry system to the periodic unsteady flow around an isolated compressor airfoil

Experimental Investigation of the Periodic Unsteady Transonic Flow Field around a Compressor Blade by Means of Particle Image Velocimetry (PIV)

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Experimental Investigation of the Periodic Unsteady Transonic Flow Field around a Compressor Blade by Means of Particle Image Velocimetry (PIV)