Local Void Fraction Distribution Research Articles

Air-Water Two-Phase Flow through a Pipe Junction : Effect of the Reynolds Number on the Local Void Fraction Distribution

Air-Water Two-Phase Flow through a Pipe Junction : Effect of the Reynolds Number on the Local Void Fraction Distribution

Air-water two-phase flow through a pipe junction. Effect of the Reynolds number on the local void fraction distribution.

Air-water two-phase flow through a pipe junction. Effect of the Reynolds number on the local void fraction distribution.

Air-water two-phase flow through a pipe junction. Experiment on the local void fraction distribution adjacent to the branching part.

The distribution of gas and liquid phases was studied experimentally in air-water two-phase flow flowing through a pipe junction with the branching angle of 90°and the area ratio of unity. The main of the junction was set up vertically and upward air-water bubbly and slug flows were arranged in the main upstream section. As the result, the local void fraction distribution in the main upstream section is almost axisymmetry. More air in the main upstream section flows into the lateral than that in the main downstream section. Therefore, nonsymmetry of the local void fraction distribution in the lateral is more remarkable than that in the main downstream section.

Distribution of Local Void Fraction of Air-Water Two-Phase Flow in a Vertical Channel

The present report describes an experimental study on the distributions of local void fraction along a cross section of a vertical channel in fully developed air-water two-phase flow at atmospheric presure, using a probe method. In bubble flow, a peculiar distribution which was fundamentally different from a power law distribution accepted in previous studies was observed. It had a peak of void fraction near the wall. The position of the maximum void fraction was at (0.5∼0.7)d from the wall where d was a bubble major axis. The authors proposed an empirical formula which was in good agreement with the present and another experimental results and applicable not only to bubble flow but also to slug flow. Comparisons between this formula and previous formulas were made in the experimental results.