Effect of Clearance on Suction Drainage from Vertical Hole

Abstract

Numerical flow analysis was conducted using fluid dynamics software to investigate the discharge of water from a vertical hole. The analysis captured the discharge of water in the vertical hole as the air jet from the drill tip pushed up the water, and the discharge of water mixed with the air by vacuum suction. It was also confirmed that the amount of residual water over time varied depending on the amount of air jet and vacuum suction. Numerical calculations were performed by changing the clearance of the drill shaft and comparing the results, and it was found that the effect of the clearance on the amount of residual water was small.