Abstract: Research results of flow patterns and phase inversion of oil-water two-phase flow in tubes are reviewed. The research advances in hydrodynamic characteristics of oil-water flow in a vertical pipe，such as drop size distribution，holdup，pressure drop，are particularly summarized. The existing problems in the research are analyzed and the research frontiers for further study on oil-water two-phase flow are also presented.

摘要： 综述了国内外有关圆管中油水两相流动过程中的流型、相转换的研究现状，并重点介绍了油水垂直两相流中液滴粒径及分布、持液率、压力降计算等方面的研究成果。同时分析了研究中所存在的问题并指出了今后的研究方向，为进一步开展油水两相流研究提供相关参考。