PTV measurement using non-tracer particle and the inverse analysis

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.