Abstract
Liquid motion and mass transfer around a single bubble was experimentally investigated. High resolution PIV and LIF methods using a high-speed-video camera enable simultaneous visualization of the liquid motion and mass transfer around a single bubble. Dissolution process of a CO_2 bubble (2.8mm diameter) rising in a zigzag trajectory was observed. As a result, the dissolution of CO_2 intensively depended on the surrounding liquid motion, especially horse-shoe type vortices. Moreover, in order to evaluate the effects of a surfactant on the mass transfer from the bubble, 1-pentanol was added. We clarified that the change of the separation phenomena due to the Marangoni convection affects both the liquid motion and the mass transfer.
