Abstract
The bubble flow often becomes a key phenomenon in diverse engineering aspects. However, bubble flows have not been clear yet. In this research, we reveal basic features of a simple air on bubble-jet flow in water quantitatively. Specifically speaking, we try to apply a three-dimensional particle tracking velocimetry (3D-PTV) to the bubble-jet flow, and to show velocity vectors of bubbles. Air bubbles are shed from a nozzle in a large water tank. The tilting-angle effect of the nozzle is investigated. As a result, the tilting-angle effect makes small bubbles less than 0.5[mm] rise outside the bubble-jet centre core.
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