한국기계가공학회지 (Journal of the Korean Society of Manufacturing Process Engineers)

  • 제20권6호
  • /
  • Pages.82-91
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  • 2021
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  • 1598-6721(pISSN)
  • /
  • 2288-0771(eISSN)
한국기계가공학회 (The Korean Society of Manufacturing Process Engineers)
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이중관 내부 나노유체의 유동방향 영향에 관한 연구

A Study on the Effect of Nanofluids Flow Direction in Double Pipe

  • 최훈기 (국립창원대학교 기계공학부) ;
  • 임윤승 (국립창원대학교 기계공학부)
  • Choi, Hoon-Ki (School of Mechanical Engineering, Changwon National University) ;
  • Lim, Yun-Seung (School of Mechanical Engineering, Changwon National University)
  • 투고 : 2021.03.09
  • 심사 : 2021.04.20
  • 발행 : 2021.06.30
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초록

We compared the heat transfer characteristics of the parallel and the counterflow flow in the concentric double tube of the Al2O3/water nanofluids using numerical methods. The high- and low-temperature fluids flow through the inner circular tube and the annular tube, respectively. The heat transfer characteristics according to the flow direction were compared by changing the volume flow rate and the volume concentration of the nanoparticles. The results showed that the heat transfer rate and overall heat transfer coefficient improved compared to those of basic fluid with increasing the volume and flow rate of nanoparticles. When the inflow rate was small, the heat transfer performance of the counterflow was about 22% better than the parallel flow. As the inflow rate was increased, the parallel flow and the counterflow had similar heat transfer rates. In addition, the effectiveness of the counterflow increased from 10% to 22% rather than the parallel flow. However, we verified that the increment in the friction factor of the counterflow is not large compared to the increment in the heat transfer rate.

키워드

과제정보

이 논문은 2021-2022년도 창원대학교연구비 지원에 의하여 연구되었음.

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