The flow acting on a confined jet flow can be represented as a conventional turbulence flow with its complex phase and characteristics. This is still effectively applied in a variety of industries, for example in ejectors. In this study coaxial confined model made of transparent acrylic pipe and driving water nozzle in order to figure out of recirculation flow near the wall of pipe and prove how flow in the pipe can be developed. It was revealed that length of the recirculation flow adjacent to wall of pipe was characterized to be larger when Reynolds Number is getting bigger.

• 김동찬(Mokpo National Maritime University) | Dong-Chan Kim
• 조대환(Member, Faculty of Marine Engineering of Mokpo National Maritime University) | Dae-Hwan Cho Corresponding Author
• 이철재(Department of Automobile Engineering of Tongmyong University) | Cheol-Jae Lee