The Flow Pattern Transition and Water Holdup of Gas–Liquid Flow in the Horizontal and Vertical Sections of a Continuous Transportation Pipe

A series of experiments were conducted to investigate the flow pattern transitions and water holdup during oil–water–gas three-phase considering both a horizontal section vertical transportation pipe simultaneously. The flowing media white mineral oil, distilled water, air. Dimensionless numbers controlling multiphase deduced understand scaling law process. was simplified as two-phase gas liquid mixture. Based on experimental data, maps constructed in terms Reynolds number ratio superficial velocity that mixture for different Froude numbers. original contributions this work are relationship between transient changes patterns with sections is established, providing basis judging pipes engineering practice. dimensionless power-law correlation presented based data. can provide theoretical support design oil transport pipelines industrial applications.