The radial migration of bubbles in two-phase bubbly flow in vertical pipes

The radial distribution of bubbles in air-water bubbly flow was experimentally investigated using a dual optical probe and hot-film anemometry. The experiments were performed in a 200mm diameter vertical pipe at liquid superficial velocity in the range of 0.2 to 0.68m/s and gas superficial velocity from 0.005 to 0.18m/s. At low void fraction flows, the radial void fraction profiles show a wall peak. As the void fraction increases the profiles …