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In ordinary PTV (Particle Tracking Velocimetry), tracer particles with the good traceability have been used. However, in the field of multiphase flow, there are needs which want to analysis non-tracer particles, such as bubbles and particles with specific gravity differenced from working fluid and a large diameter. Therefore, it is necessary to discuss on the traceability of non-tracer particle. In this study, the traceability for these non-tracer particles is estimated by using Lagrangian method, which directly uses the translation momentum equation of a non-tracer particle. Also velocity vectors of working fluid for the non-tracer particle are obtained by inverse analysis, these force components acted on the non-tracer particle are shown.

PTV measurement using non-tracer particle and the inverse analysis