Residual Liquid after Passage of Gas Liquid Interface in Horizontal Pipe. In the Case of Progress of Front at Acceleratedly Velocity.

Abstract

When gas is suddenly injected from a nozzle into a stationary liquid in a horizontal circular pipe, a thin liquid film is left on the wall after the passage of the interface front. The residual liquid film thickness in the case of the progress of the interface front at acceleratedly velocity is studied experimentally. The limit front velocity, to which the modified Bretherton's equation is applicable, depends on the Reynolds number, which the virtual diameter is used as the characteristic length. The residual liquid has a great influence on the tip velocity, and the variation of the tip velocity with the tip position is complex. At the position of the minimum acceleration of the liquid flow, the condition of the residual liquid changes.