The Particle Tracking Velocimetry ( PTV ), which is one of the quantitative flow visualization techniques, enables to measure both instantaneous velocity distributions and traveling paths of fluid elements in relation with the condition of the whole flow field. And hence the technique is believed to become a useful tool for the measurement of mixing flows.
In the present experiment, the binary correlation method, one of the PTV algorithms, is used in the measurement of the strong mixing flow in a cylindrical bath which is agitated by a bubbling jet from the bottom. The distributions of liquid phase such as instantaneous or short-time averaged velocity and those of RMS values of fluctuation are measured. Also velocities and sizes of rising bubbles are simultaneously measured.
