Abstract
In this paper, the occurrence spheres of various pipe flows with one steep slope are shown experimentally as regards ventilation and non-ventilation, as well as being investigated by using the boundary of full pipe flows to the indexes. The results are as follows.
First, it is indicated that Ho/D=1. 5 (Ho: depth in front of the pipe inlet, D: diameter of pipe) of non-ventilation remain on the boundary between full pipe flow and the flow in case a mass of air exists, and the relationships between pressure head in air mass and Ho/D are indicated. Next, it is indicated that full pipe flows and other flow patterns can be divided by hydraulic equations. Then in occurrence spheres of flows when air mass existed, its characteristics and occurrence sphere expression of hydraulic moving jump are given as information.
