3D-PTV Measuring on Bubble and Liquid Velocities of a Single Bubble Jet

概要

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This experimental research concerns a simple air-bubble jet from a bottom nozzle in water. We try to conduct the measurements of the flow by applying a three-dimensional particle-tracking-velocimetry (3D-PTV) technique, in order to specify both bubble (air) and liquid (water) velocities. As tracer particles, we regard bubbles themselves in bubble-velocity measurements, and polyethylene particles suspended in water in liquid-velocity measurements. Then, we visualise the three-dimensional motions of the bubbles and the liquid. As we record stereo images using a pair of high-speed video cameras, we can get temporally-consecutive spatial information both bubble's and the liquid's. As a result, we quantitatively reveal the three-dimensional and instantaneous behaviour of the unsteady bubble-jet flow. And, using the obtained three-dimensional information, we show the fundamental flow structure of the bubble jet from a statistical view point.