EXPELIMENTAL STUDY ON THE ABILITY TO INDUCE A UNIDERECTIONAL FLOW BY A PIPE WITH A FLANGE

Abstract

In order to activate water exchange between a semi-enclosed bay and its open sea, a water purification method, called One-Way Pipe, is proposed. One-Way Pipe is a pipe attached asymmetrical structures inside, and can generate residual currents in oscillatory flow fields due to their directional resistance properties. This method is more economic and eco-friendly because it utilizes waves as energy sources. In this study, the optimum size and the position of the flange to generate residual currents were experimentally investigated under several wave conditions. Furthermore, the mechanisms for producing a unidirectional flow inside the pipe were discussed. The flange forms separation vortices behind it and generate a low pressure region behind the outlet of the pipe. This low pressure region due to separation vortices draws mass flow inside the pipe.