Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Experimental Study of Friction Factors for Laminar, Transition, and Turbulent Flow Regimes in Helical Coil Tubes

헬리컬 코일 튜브에서의 층류, 천이, 난류 영역의 마찰계수에 대한 실험적 연구

  • Park, Won Ki (Department of Plant System and Machinery, University of Science and Technology) ;
  • Kim, Taehoon (Department of Plant System and Machinery, University of Science and Technology) ;
  • Do, Kyu Hyung (Department of Plant System and Machinery, University of Science and Technology) ;
  • Han, Yong-Shik (Department of Plant Safety Technology, Korea Institute of Machinery and Materials(KIMM)) ;
  • Choi, Byung-Il (Department of Plant Safety Technology, Korea Institute of Machinery and Materials(KIMM))
  • 박원기 (과학기술연합대학원대학교 플랜트기계공학과) ;
  • 김태훈 (과학기술연합대학원대학교 플랜트기계공학과) ;
  • 도규형 (과학기술연합대학원대학교 플랜트기계공학과) ;
  • 한용식 (한국기계연구원 에너지플랜트안전연구실) ;
  • 최병일 (한국기계연구원 에너지플랜트안전연구실)
  • Received : 2017.12.05
  • Accepted : 2017.12.21
  • Published : 2018.02.28
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Abstract

The friction factors according to the flow regimes in helical coil tubes depend on the coil diameter, the tube diameter, and the coil pitch. In previous studies, correlations for the laminar flow regime in helical coil tubes have been proposed. However, studies on the transition flow regime and the turbulent flow regime are insufficient and further researches are necessary. In this study, characteristics of the friction factors for the laminar, transition and turbulent flow regimes in helical coil tubes were experimentally investigated. The helical coil tubes used in the experiments were made of copper. The curvature ratios of the helical coil tubes, which means the ratio of helical coil diameter to inner diameter of the helical coil tube are 24.5 and 90.9. Experiments were carried out in the range of $529{\leq}Re{\leq}39,406$ to observe the flows from the laminar to the turbulent regime. The friction factors were obtained by measuring the differential pressures according to the flow rates in the helical coil tubes while varying the curvature ratios of the helical coil tubes. Experimental data show that the friction factors for the helical coil tube with 24.5 in the curvature ratio of the helical coil tube were larger than those in the straight tube in all flow regimes. As the curvature ratio of the helical coil tube increases, the friction factor in turbulent flow regime tends to be equal to that of the straight tube. In addition, it was confirmed that the transition flow regimes in the helical coil tubes were much wider than those in the straight tube, also the critical Reynolds numbers were larger than those in the straight tube. The results obtained in this experimental study can be used as basic data for studies on the water hammer phenomenon in helical coil tubes.

Keywords

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