Abstract
We study the motion of a pair of bubbles rising in the vertical line in intermediate Reynolds number, both numerically and experimentally. It has been predicted by the analytical and numerical studies that the trailing bubble approaches the leading bubble and then a pair of bubbles keeps the mutual equilibrium distance. However, no experimental results have ever confirmed the existence of the equilibrium distance between a pair of bubbles rising in the vertical line. Most of experimental results reported that a pair of bubbles collided. We solve this paradox and answer the question : “If there is an equilibrium distance ?” by presenting the first experimental evidence of the existence of the equilibrium distance. Moreover we show that the equilibrium distance is considerably unstable by experimental results.
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