Question

When modeling multiphase flow in a long-distance tie-back, which flow regime is characterized by high gas velocity causing a continuous liquid film on the pipe walls and a gas core in the center?

Accepted Answer

The flow regime characterized by high gas velocity forming a continuous liquid film on the pipe walls and a gas core in the center is called annular flow. In this regime, the gas phase travels at a significantly higher velocity than the liquid phase, creating enough shear force to push the liquid against the pipe walls. The liquid forms a thin, relatively smooth or wavy layer along the entire inner circumference of the pipe. Simultaneously, the gas flows rapidly through the open space in the middle of the pipe, often carrying small droplets of liquid that have been stripped from the surface of the film. This flow pattern is typical in long-distance subsea tie-backs when gas production rates are high relative to the amount of liquid present, allowing the gas to effectively drag the liquid along the pipe walls toward the processing facility.

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When modeling multiphase flow in a long-distance tie-back, which flow regime is characterized by high gas velocity causing a continuous liquid film on the pipe walls and a gas core in the center?

The flow regime characterized by high gas velocity forming a continuous liquid film on the pipe walls and a gas core in the center is called annular flow. In this regime, the gas phase travels at a significantly higher velocity than the liquid phase, crea....