1943 Characteristics of Surrounding Liquid Motion Induced by the Collision of a pair of Bubbles
Details
Characteristics of the surrounding liquid motion through the collision of a pair of bubbles were experimentally investigated. Hypodermic needles and a bubble generator utilizing pressure oscillation were employed to exactly extract and highly reproduce the interaction between the liquid-phase motion and bubble motion at the collision. The recursive cross correlation PIV technique made it 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 liquid-phase 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.
