Flow Regime Transitions for Vertical Upward Gas Liquid Flow: A. A Model for Flow Regime Transitions for Vertical Upward Gas Liquid Flow-Effect of Properties and Line Size. B. A Theoretical Approach to the Prediction of Flow Regime Transitions in Unsteady

摘要

The computer program was developed to study flow regime transitions and to study the effect of line size and fluid properties. The fundamental equations predicting transition conditions include the effects of both property and line size. To demonstrate the effects on the conventional velocity coordinate map, the transitions were calculated for air-water at atmospheric conditions in vertical tubes of 1, 2, 8, and 12 inches in diameter. The bubble-slug and the churn-annulat transitions were unaffected by line size. However, as the line size increased, the zone of churn flow diminished. The effect of physical properties on the uL/uG regime map as predicted by the theory is demonstrated in the report, with a shift being shown in all boundaries. Most dramatic was the collapse of the churn region for higher density gas and a corresponding extension of the annular flow region.