Research on the Flow Characteristics of Low Liquid holdup Gas Liquid Two Phase

With the continuous growth of natural gas demand, the low liquid content gas-liquid two-phase flow characteristics of wet natural gas during pipeline transportation have become a research hotspot. Accurate prediction of pressure drop gradient is crucial for pipeline design, operational safety, and economic benefits. This article summarizes the flow characteristics of gas-liquid two-phase flow with low liquid content in wet natural gas pipelines, and focuses on analyzing the applicability and predictive performance of three typical theoretical models (FLAT model, ARS model, and double circle model). The FLAT model is based on the assumption of a horizontal interface, which is computationally simple but ignores interface fluctuations; The ARS model considers the gas-liquid shear effect and is suitable for low liquid content conditions; The double circle model assumes a more realistic flow through a double arc interface, but the calculation is complex. Research has shown that existing models still have limitations in predicting complex conditions such as inclined pipelines, high flow rates, and droplet entrainment. Future research needs to combine multi-scale simulation, intelligent algorithms, and high-precision experiments to further enhance the universality and engineering applicability of the model. This article provides a systematic reference for the theoretical research and engineering practice of the flow characteristics of wet natural gas pipelines.