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Characteristics of the surrounding liquid motion through the collision of a pair of bubbles were experimentally investigated. Hypodermic needles and a bubble generator util izing pressure oscillation were employed to exactly extract and hignly reproduce the interaction between the liquidphase motion and bubble motion at the collision. The recursive cross correlation PIV technique made i t possible to obtain the accurate velocity field of the surrounding liquid motion of a pair of bubbles. From the PIV results, standard deviation of liquid-phase velocity was calculated as the turbulence intensity of turbulence induced by a pair of bubbles. Comparing the turbulence intensity of liquidphase velocity at each case, the case of collision and the case of no collision, the turbulence intensity of vertical liquid-phase velocity is obviously different. Especially at the case of collision, the turbulence intensity of vertical liquid-phase velocity around the collision point shows high value.

Visualization of surrounding liquid motion and pseudo-turbulence induced by the collision of a pair of bubbles via PIV measurement