Abstract
The flow patterns of the air-water two-phase flow in horizontal and horizontal-downward declined pipes were studied experimentally in order to obtain basic information on the flow characteristics of gas-liquid two-phase flows in hilly-terrain pipelines. It is one of the special characteristics of the flow pattern in these hilly-terrain pipelines that the developing and/or unsteady flow patterns occupy almost whole pipes. Flow pattern maps were presented through a new classification and definition. The concept of “basic and auxiliary flow patterns” was introduced. The flow state was expressed by the combination of a basic flow pattern and some auxiliary flow patterns. The flow behavior greatly changes along hilly-terrain pipelines. It is impossible to predict the flow patterns with existing flow pattern maps for single pipes.
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