Behavior of Pressurized Gas Injected into Liquid in Horizontal Pipe (Gas Flow under the Domination of Gravity Current)

摘要

The behavior of gas suddenly injected from a nozzle into a stationary liquid in a horizontal circular pipe is studied regarding the case where the inner diameter of the pipe is much greater than the limiting bubble thickness. If the ratio of the nozzle diameter to the inner diameter of the pipe is greater than 0.3, the front of the gas-liquid interface acceleratedly advances. If the ratio is less than 0.25, the front advances almost at a constant velocity due to the gravity current. A thin liquid film is left on the wall after the interface front passes. At high gas flow rates, the film thickness is almost uniform everywhere on the wall. At low gas flow rates, it depends on the surface tension and the viscosity of the liquid alone. At lower gas flow rates, it is almost constant regardless of the gas flow rate.