In the present study, pipe flows are used to investigate the behavior flow of water-CO2 mixtures at different pressures and temperatures. The flow rate and pressure of water and CO2 are changed by using a pump placed ahead of the mixing point. Pressure and temperature levels are recorded by pressure sensors and thermocouples affixed at points along the pipe loop. The flow regimes of two-phase water-CO2 flow is visualized through transparent tubes using a high-speed camera. After several

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... nts, it was found that the mean pressure drop along the tube for a water-CO2 system flow is about 4 kPa/m for water flow rates between 0.4 and 0.7 L/S and CO2 flow rates between 2.5 and 11 L/S. The maximum inlet pressure for water is 400 kPa and for CO2 is 3000 kPa. In this experiment, the phase fraction of water is approximately 0.5-0.15 and the phase fraction of CO2 is around 0.85-0.95. The investigated flow regime under these flow conditions is often intermittent.