Journal of Convergence for Information Technology (융합정보논문지)

Convergence Society for SMB (중소기업융합학회)
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Numerical Study of Forced Convection Nanofluid in a U-Bend Tube

U-밴드 관 내부 나노유체의 강제대류에 관한 수치적 연구

  • Jo, Sung-Won (Division of Smart Manufacturing Engineering, Changwon National University) ;
  • Choi, Hoon-Ki (Division of Mechanical Engineering, Changwon National University) ;
  • Park, Yong-Gap (Division of Mechanical Engineering, Changwon National University)
  • 조성원 (창원대학교 스마트제조융합협동과정) ;
  • 최훈기 (창원대학교 기계공학부) ;
  • 박용갑 (창원대학교 기계공학부)
  • Received : 2022.01.11
  • Accepted : 2022.03.20
  • Published : 2022.03.28
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Abstract

Fluid flow and thermal characteristics of laminar nanofluid(water/Al2O3) flow in a circular U-bend tube have been studied numerically. In this study, the effect of Reynolds number and the solid volume fraction and the impact of the U-bend on the flow field, the heat transfer and pressure drop was investigated. Comparisons with previously published experimental works on horizontal curved tubes show good agreements between the results. Heat transfer coefficient increases by increasing the solid volume fraction of nanoparticles as well as Reynolds number. Also, the presence of the secondary flow in the curve plays a key role in increasing the average heat transfer coefficient. However, the pressure drop curve increases significantly in the tubes with the increase in nanoparticles volume fraction.

원형단면 U-밴드 튜브에서 층류인 나노유체(물/Al2O3)의 유동 및 열적 특성을 수치적으로 연구하였다. 이 연구에서는 U-밴드 내부유동에서 Reynolds 수와 고체 체적분율의 영향이 유동장, 열전달 및 압력강하에 미치는 영향을 연구했다. 원형곡관에 대한 이전에 발표된 실험 결과와 본 수치해석의 결과가 잘 일치함을 보여 해석방법의 타당성이 있음을 확인하였다. Reynolds 수 뿐만 아니라 나노입자의 고체 체적분율을 증가시키면 열전달계수도 증가함을 보였다. 또한 곡관에서 형성되는 2차 유동은 평균 열전달계수를 높이는 데 중요한 역할을 한다. 그러나 압력강하 곡선은 나노입자 농도가 증가함에 따라 크게 증가함을 보였다.

Keywords

Acknowledgement

This paper was supported by the research fund of Changwon National University in 2021-2022.

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