Experimental study of flow parameters in vertical upwards gas-liquid two-phase plug flow (effect of pressure)

The effects of line pressure in gas-liquid two-phase plug flow cause a significant change in gas-liquid interfacial structures. The primary purpose of this study is to investigate the pressure effects on the liquid and gas slug in the plug flow regime. In this study, the pressure in the closed-loop system was changed from 0.3 to 20 MPa at constant fluid temperature on vertical upward flow. The mean amplitude of the liquid slug, mean length of the gas and liquid slug, and mean liquid holdup around the gas slug were measured to investigate the characteristics of plug flow. In gas-liquid two-phase flow, the disappearance of the liquid slug brings about serious changes in the liquid transport mechanism. The approximate experimental equation for the points is presented.