Abstract: The paper analyzes the flow mechanism,shape characteristics and inner velocity distribution of gas-liquid slug flow in a horizontal pipe,and develops a physical model for the horizontal pipe.In a steady slug unit,lift velocity is always equal to shedding velocity,so the slug can keep an established shape.The model divides the slug into two parts:liquid-slug and film/bubble zone.For the liquid-slug zone,mass conservation and momentum conservation equations are built up to compute the local liquid-holdup and pressure-drop.For the film area,the model takes film height variation into consideration,assuming the height is only varying along the flow direction but not in the radial direction.The paper deduces a film height variation expression by building local control equations,and then develops a film height via liquid-holdup function and a film height via wet-diameter function.By comparing with test data and some other models,this model presents more accurate prediction results of liquid-holdup and pressure-drop.

Key words: horizontal pipe, slug flow, pressure-drop, liquid-holdup

摘要： 分析了水平管内气液两相段塞流的运动特性和形态特征以及段塞单元内部的速度分布规律,建立了水平管路气液两相段塞单元的物理模型。将一个完整的段塞流单元分为液相段塞区和液层/气泡区,建立了液相段塞区的质量和动量守恒方程,计算了其压降和持液率;对液层区,模型考虑液层厚度分布不均(坡状液层)对参数计算的影响,通过建立局部控制方程,推导了液层高度随流动方向坐标变化的表达式,并将持液率和湿周写成液层高度的函数。通过与实验和其他模型的计算结果对比,本文建立的模型可以对压降和持液率有更准确的预测结果。

关键词: 水平管, 段塞流, 压降, 持液率