关键词: 垂直管;气液两相弹状流;含气率;空隙度;化学工业;流体力学

Abstract: In order to investigate the influence of the entrance effect on the spatial distribution of
phases, the experiments on gas-liquid two-phase slug flow in a vertical pipe of 0.03m ID
were carried out by using optical probes and an EKTAPRO 1000 high speed motion analyzer. It
demonstrates that the radial profile of slug flow void fraction is parabolic. Influenced by
the falling liquid film, the radial profile curve of liquid slug void fraction in the wake
region is also parabolic. Since fully turbulent velocity distribution is built up in the
developed region,the void fraction profile in this region is the saddle type. At given
superficial liquid velocity, the liquid slug void fraction increases with gas velocity. The
radial profiles of liquid slug void fraction at different axial locations are all saddle
curves, but void fraction is obviously high around the centerline in the entrance region.
The nearer the measuring station is from the entrance, the farther the peak location is
away from the wall.

Key words: gas-liquid slug flow, void fraction, vertical pipe