Abstract
Gas-liquid-solid three-phase bubbly flow in a vertical pipe is observed.Air, tap water and aluminum-ceramic balls of mean diameters 4.16 and 24.8mm were flowed in two vertical pipes with similar size of 30.3 and 30.8mm inside diameters and about 7.5m in height.The motions of small bubbles, small particles and large particles of two-phase flow and three-phase flow were recorded by a 8mm CCD video camera and a high speed video camera.Their motions were explained and qualitatively compared with each others.It become clear that the rising velocity of cluster composed of small bubbles differs from that of cluster of small particles in gas-liquid-solid three-phase bubbly flow with small particles, and the rising velocity of large particle in gas-liquid-solid three-phase bubbly flow with large particles is larger than that of in liquid-solid two-phase flow with large particles.The former phenomenon is explained by the difference of their buoyancy in liquid phase.The latter phenomenon shows that there is strong interaction between large particle and small bubbles through the liquid when they flow through the thin clearance between large particle and pipe wall.
