第４部門①

[2D01-04-03] Drainage function of vertical pipe flow due to artificial spiral flow

*Youichi Yasuda¹, Tetsuta Murano² (1. Nihon University, College of Science and Technology, Dept. of Civil Engineering, 2. Nihon University, Graduate School of Science and Technology, Dept. of Civil Engineering)

Keywords:Spiral flow, Drainage Facility, Discharge Coefficient

Clarification of hydraulics in vertical pipe flow connected to manhole is significant for the drainage faculty during rainfall. The installation of a spiral coil in vertical pipe connected has a potential to create effective drainage function. As a first stage, experimental investigation on drainage function of vertical flow was conducted by using an adjusting tank connected to a vertical pipe. In vertical pipe with a spiral coil, covering the upper part of the suction vortex will work suction on the cover and greatly improve the drainage function.