抄録
The motions of copper particles and tracer particles in a turbulent water duct flow have been simultaneously visualized in order to understand the fundamental interactions between heavy solid particles and turbulence. The images of these particles illuminated by a laserwere captured by two CCD cameras which were synchronized by a trigger signal. The tracer particles were coated with a fluorescent matter which emits light with a wavelength different from that of the laser beam. An optical filter was attached to one CCD camera to cut off the laser light reflected by the copper particles and duct walls. The captured images were directly recorded into the memories of personal computers through frame grabber boards. By analyzing the optically filtered images of the tracer particles, the velocity field of the carrier fluid flow is obtained.
