Investigation of the solitary wave in the transition of countercurrent to cocurrent gas-liquid vertical two-phase flow (flooding)

This paper presents the results of an experiment on a countercurrent gas-liquid two-phase flow in a transparent vertical tube with a diameter of 40,6 mm and a length of 2720 mm. The experiment was conducted in the annular flow-regime, the film liquid flows downward and the gas flows upward. If the gas velocity is sufficiently high, there exists a climbing film liquid. It\u27s mean that the transition of countercurrent to cocurrent flow or flooding begins. In this experiment, the transition seems to be always triggered by passage of a solitary wave (soliton) which propagated from the bottom near the water outlet to the top. The velocity of the propagation and the amplitude of the soliton are increased by liquid flowrate. Kata kunci : soliton, fenomena transisi, aliran gas-cair berlawanan arah