Abstract
In order to make clear the phenomena of bubble growth and bubbles coalescence, the following items were studied. 1) Growth and released behavior of a bubble formed at the nozzle tip. 2) Coalescing behavior of two bubbles formed at the two nozzle tips. 3) Coalescing behavior of many bubbles rising in the liquid. 4) Flow behavior of a bubble group. And then, the beginning conditions of bubble coalescence were studied under the hypothesis based on the these observation results. As a result, the bubble coalescence is predicted by considering the influence of the swing of bubbles.
