Abstract
This experimental research concerns an air-bubble-jet flow in water. The authors try to conduct the measurements of the flow applying a three-dimensional particle-tracking-velocimetry (3D-PTV) technique, in order to show both air-bubble and liquid (water) velocities. As tracers, we regard air bubbles in bubble-velocity measurements, and we regard polyethylene particles suspended in the liquid in liquid-velocity measurements. Then, we visualise the three-dimensional motions of air bubbles and ambient liquid. As we record stereo images using two high-speed video cameras, we can get timely-consecutive information of air-bubble and ambient-liquid motions. As a result, we quantitatively reveal the three-dimensional instantaneous motion of an unsteady bubble-jet plume from a simple air nozzle.
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