On the Flow of the Air-Water Mixture in the Branch Pipe : 1. Experiment on the Horizontal Branch Pipe Which is Equal to the Main One in Diameter

Authors experimented on flow patterns, distribution of quantity, especially loss of head at a cross-branch section by flowing air-water mixtures into a horizontal branch pipe of 23.4 mm in dia. They carried out the investigation from the following two view-points : (1) ξb1, loss of energy attributable to the branch only. (2) ξb2, loss of energy including the effect of the irregularity of the stream past a branch section. In consequence, it was possible for them to make the characteristics of the loss of energy comparatively clear. Then they discovered that the coefficient of loss of head ξb2' was approximately proportionate to the ratio of energy at the main flow and the branch flow.