In this paper, internal and external flow analysis of nozzle for a automatic bike washing machine was performed using Ansys Fluent, by varying nozzle injection pressure and angle. The pressure and velocity distributions generated at the nozzle outlet from internal flow analysis were applied for inlet condition of the external flow analysis of the nozzle. As a criterion for the cleaning efficiency, the shear stress condition provided by EHEDG[5] was used and an area of shear stress of 3 Pa or more according to the spray angle and pressure was compared. It is expected that the results of this paper will be applied to the development of automatic contactless bike washing nozzle.

ABSTRACT
 1. 서 론
 2. 수치모델링
  2.1 지배방정식
  2.2 난류모델
 3. 다상유동기법
  3.1 Volume of Fluid(VOF)
  3.2 Eulerian
  3.3 Lagrangian
 4. 유동 수치 해석
  4.1 해석 모델
  4.2 수치해석
  4.3 수치해석 결과
 5. 결 론
 References

• 장용재(School of Aeronautical and Mechanical Engineering, Cheong-ju University) | Y. J. JANG
• 임동균(School of Aeronautical and Mechanical Engineering, Cheong-ju University) | D. K. Im Corresponding Author