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DOI: 10.1615/ICHMT.1992.IntSympImgTranspProc.310
pages 333-341

Tomomasa Uemura
Faculty of Engineering, Kansai University, 3-3-35 Yamate, Suita-shi, Osaka, 564 Japan

Fujio Yamamoto
Faculty of Engineering, University of Fukui, Fukui 910-8507, Japan

Manabu Iguchi
Faculty of Engineering, Osaka University, 2-1 Yamada-oka, Suita-shi, Osaka, 565, Japan


Many investigators of experimental mechanics have been interested in quantitative flow visualization techniques; the primary advantages lie in their non-invasive nature and in their capabilities of full-field measurements. Most of the techniques were based on photographic recording. However, recent developments in video and computers have stimulated experimental techniques.
By combining the traditional techniques and the digital image processing, a variety of methods have been developed, and a wide variety of flow regimes have been measured. Most of them, though, are applicable only to two-dimensional (2D) flow, but a method of particle tracking velocimetry (PTV), including a path-line analysis method, is able to measure three-dimensional (3D) flow velocity. However, some difficulties lie in the actual measuring processes.
In the 2D PTV analysis, the operation of establishing correspondences of tracers between pictures captured sequentially with a short time interval follows directly after the extraction of tracer-data. In the 3D PTV, an additional operation of determining 3D coordinates of tracers is incorporated into the analysis. Theoretically, the coordinates can be determined from two or three pictures taken from well defined directions. As the concentration of tracer particles in the space becomes higher, this procedure becomes more difficult and takes longer time.

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