Influence of viscosity, surface tension, and inclination angle on motion of long bubbles in closed tubes

摘要

An experimental study has been made of the motion oflong bubbles in closedudtubes. The influence of viscosity and surface tension on the bubble velocity isudclarified. A correlation of bubble velocities in vertical tubes is suggested and isudshown to be useful for the whole range of parameters investigated. In addition,udthe effect of tube inclination angle on bubble velocity is presented, and certainudfeatures of the flow are described qualitatively.