Investigation Of Interfacial Structure Measurement In Gas-liquid Two-Phase Flow

Two-phase flow is encountered in production and transportation system of oil and gas and nuclear power industry. Accurate measurement of the flow parameters is essential for the study of two-phase flow. Therefore, new measuring technologies have to be developed in order to reveal the variation of the flow parameters in two-phase flow. It is of great significance not only for the industry practice but also for the multiphase flow research.New capacitance sensor has been developed for two-phase flow measurement. Experiments were performed in air-water two-phase flow and air-oil two-phase flow through a horizontal pipe with 12 m long, 26 mm inner diameters. The void fraction and flow parameters were measured. The results show that the novel capacitance sensor is successfully used in gas-liquid two-phase flow. And the performance capacitance sensor for the oil-gas flow measurement is better than conductance probes and quick close values.The experimental result was presented, the variation about void fraction of liquid slug in air-oil flow. The model was developed as a function of the mixture velocity and void fraction in slug flow, and this model was compared with other models. The liquid film thickness is affected by the superficial gas velocity in air-oil slug flow. Thickness of liquid film decrease as the superficial gas velocity increases.The differential capacitance method is used to identify the liquid slug length and slug velocity. The experimental results show that the mean liquid slug length is 19.8D in the full development of air-distilled water slug flow, and the averaged liquid slug length is 17.7 D in air-oil slug flow. The mean liquid slug length increases as the superficial gas velocity increases in air-oil flow.The correlation of the translational velocity of liquid slug was presented in gas-liquid flow, and the slip coefficient C0≈1.2.The experimental result show the frequency tendency of slug is nearly consistent in air-water flow and air-oil flow under the same experiment conditions.