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Stereoscopic particle image velocimetry applied to liquid flows

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Abstract

A twin-camera stereoscopic system has been developed to extend conventional high image-density Particle Image Velocimetry (PIV) to three-dimensional vectors on planar domains. The stereoscopic velocimeter performs with extremely high accuracy. Translation tests have yielded errors (rms) of 0.2% of full-scale for the in-plane displacement, and 0.8% of full-scale for the out-of-plane component, both of which agree with the errors predicted by an uncertainty analysis. In addition, modified techniques in hardware and software have enabled the stereoscopic system to perform successfully when acquiring images through a thick liquid layer, wherein previously the aberrations arising due to the liquid-air interface have restricted the use of such systems. With these techniques, the stereoscopic system, in combination with a simple method for image-shifting, is able to accurately measure threedimensional velocity fields in liquids. This is demonstrated by measurements of the helical, three-dimensional flow induced by a rotating disk in glycerine.

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  1. A. K. Prasad

    Present address: Dept. of Mechanical Eng., University of Delaware, 19716-3140, Newark, DE, USA

Authors and Affiliations

  1. Dept. of Theoretical and Applied Mechanics, University of Illinois, 61801, Urbana, IL, USA

    A. K. Prasad & R. J. Adrian

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  1. A. K. Prasad
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  2. R. J. Adrian
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Prasad, A.K., Adrian, R.J. Stereoscopic particle image velocimetry applied to liquid flows. Experiments in Fluids 15, 49–60 (1993). https://doi.org/10.1007/BF00195595

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