Modelling experimental investigation of two-phase gas-liquid flow patterns in horizontal pipes

In two-phase flow systems the effect of flow patterns on the behavior of the dynamic flow and heat transfer is very important. The study of flow patterns belongs in the fundamental research that have strong practicality. Flow patterns and their transitions in horizontal pipes have been up to now experimentally studied by a number of investigators, and many flow pattern maps and their transition correlations have been proposed. Besides the complexity of flow patterns themselves, the following account for the occurrence of this impracticability: most of these studies were confined to air-water (i.e. two components) systems; most of these studies were confined to normal atmospheric condition; most of these studies were confined to adiabatic condition; there have not common principles on the classification of flow patterns and common definitions of flow patterns yet; and the better coordinate parameters of flow pattern map have not been found as yet. In order to reveal the effect of parameters and components on flow patterns and their transitions thoroughly, in this study the modelling experiment and analysis of horizontal heated channel flow patterns for single component fluid medium (F-12) at higher pressure (the pressures of F-12 were 10-15 bar, corresponding to water system pressures 65-95 bar) were made