In this work, particular efforts are devoted to the experimental investigation of developing intermittent flows (plug and slug flows) in horizontal pipes in order to attain a thorough physical understanding of the internal structure of these two-phase flow patterns. Experimental data is acquired with specific attention to the development of stratified and wavy flow regimes to intermittent flow regimes. The distribution of the phases, several relevant flow characteristics and the behaviour of the bubbles in the liquid phase are identified by means of wire-mesh sensor data. The main differences between plug and slug flow are elucidated and the influence of the slug void fraction on the characteristics of these flows as well as the behaviour of the dispersed bubbles in the slug body are analysed in detail. The simultaneous use of the PIV technique and the Pulsed Shadowgraph technique are adapted for horizontal two-phase pipe flows within this work, allowing the study of the kinematics of stratified, wavy, plug and slug flows. Turbulent quantities of these flows are also analysed.    «

In this work, particular efforts are devoted to the experimental investigation of developing intermittent flows (plug and slug flows) in horizontal pipes in order to attain a thorough physical understanding of the internal structure of these two-phase flow patterns. Experimental data is acquired with specific attention to the development of stratified and wavy flow regimes to intermittent flow regimes. The distribution of the phases, several relevant flow characteristics and the behaviour of the...    »