抄録
A mixing flow in a cylindrical vessel agitated by a bubbling jet is analyzed quantitatively by using the binary cross correlation method, which is a particle tracking velocimetry (PTV). With this method quantitative results such as instantaneous velocity distributions, velocity fluctuations and particle paths can be obtained easily in a short time. Instantaneous motions of dispersed air bubbles in a water vessel are tracked by establishing correspondence of particle pairs between two sequentially frozen pictures.
As a result, a pair of circulation flow pattern was found in the upper region of the vessel and the mixing flow was regarded as three dimensional turbulent flow with large and impulsive fluctuations superposed frequently on the general velocity variation at low speed, though the image processing technique was of a two dimensional type.
