This study is carried out to analyze the velocity distribution for each location and the uniformity index according to straight distance on exit side by changing the design factors of branch pipe connected to 180° circular mixing-tee using RSM(Reynolds Stress Model) turbulence model. As the results of the flow characteristics according to hydraulic diameter, the velocity profiles in the 90° sectional area are generally similar. In the 180° section, the maximum velocity point shows Y/D=0.7~0.8 after rapid increase of the flow velocity. In the result according to the distance away from inlet, the maximum velocity point in the 90° sectional area is located in outer side of the curved pipe as the distance away from inlet increases. In the 180° sectional area, the maximum velocity point is showed in Y/D=0.7~0.8 after the rapid increase of the flow velocity regardless of the variation of branched distance. In case of inclined angle, the maximum velocity point in the 90° sectional area is located in outer side of the curved pipe as the inclined angle increases. In the 180° sectional area, the maximum velocity point is observed in Y/D=0.8 regardless of the inclined angle. In addition, the uniformity index of flow velocity shows that it is stabilizing after approximately L/D=40 away from the end of the curved pipe regardless of the flow factors in the branch pipe.

ABSTRACT
 1. 서 론
 2. 수치해석
  2.1 해석모델
  2.2 수치해석
  2.3 난류모델의 타당성 검증
 3. 결과 및 고찰
  3.1 분기관의 수력직경에 따른 유동특성
  3.2 분기관의 이격거리에 따른 유동특성
  3.3 분기관의 경사각도에 따른 유동특성
 4. 결 론
 References

• 이형민(Graduate student of Mechanical Engineering Department, Gachon Univ.) | Hyung-Min Lee
• 김광추(Specialist of Mechanical & Plant Design Engineering Department, KEPCO E&C.) | Kwang-Chu Kim
• 임종한(Professor of Mechanical Engineering Department, Gachon Univ.) | Jong-Han Lim
• 윤준규(Department of Mechanical Engineering, Gachon University) | Jun-Kyu Yoon Corresponding Author