Three Dimensional Velocity Measurements Using Hybrid HPIV
A hybrid holographic particle image velocimetry system has been developed and implemented while studying fully developed turbulent flow in a rectangular channel. The system combines the advantages of both in-line and off-axis holography without having their drawbacks. It improves the signal to noise ratio of the reconstructed images, allows use of 3 – 15 µm particles in water at high density, and achieves large dynamic ranges both in velocity and space. An automated image acquisition system and correlation based software are used for analyzing data. In a sample volume of 47 × 47 × 42 mm3 the data consist of 97 × 97 × 87 vectors. The success rate exceeds 80% of the total sample points. Sample results are provided.
KeywordsHolography Particle Image Velocimetry Whole Field Measurement
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