Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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Vertical Upward Air-Water Two-Phase Flow Regime Identification

수직상향류 공기-물 이상유동영역 판별

  • Lee, Ba-Ro (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Jang, Young-Jun (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Ko, Min-Seok (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Lee, Bo-An (Institute for Nuclear Science and Technology, Jeju National University) ;
  • Lee, Yeon-Gun (Institute for Nuclear Science and Technology, Jeju National University) ;
  • Kim, Sin (Department of Nuclear and Energy Engineering, Jeju National University)
  • 이바로 (제주대학교 에너지공학과) ;
  • 장영준 (제주대학교 에너지공학과) ;
  • 고민석 (제주대학교 에너지공학과) ;
  • 이보안 (제주대학교 원자력과학기술연구소) ;
  • 이연건 (제주대학교 원자력과학기술연구소) ;
  • 김신 (제주대학교 에너지공학과)
  • Received : 2013.08.05
  • Accepted : 2013.11.18
  • Published : 2013.12.31
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Abstract

Two-phase flow is frequently observed in many industries such as nuclear power plants and oil transportation. Two-phase flow regime depends on the flow rates, the fluid properties and the structure of flow channels. Since the identification of the flow regime is of great importance in the system design and the safety analysis, a number of theoretical and experimental investigations have been performed. This paper presents a basic research on the characteristics of each flow regime and transition boundary in the two-phase flows. The flow regime of the upward air-water flow in the vertical tube, 30 mm in the inner diameter, is distinguished by using the high-speed camera and the Wire-mesh sensor(WMS). The identified experimental data are compared with the flow regime maps proposed by Taitel et al, Mishima and Ishii. Even though there is slight difference in the transition boundary, the experimental data show general agreement with these flow regime maps.

이상유동은 원자력 발전소 내 노심과 석유 수송 등 여러 산업 분야에서 빈번히 관찰된다. 이상유동영역은 두 상의 성질과 유량의 차이, 그리고 유로의 구조에 따라 결정된다. 유동영역의 판별은 시스템 설계 및 안전 해석에 있어 중요하기 때문에 많은 이론과 실험 연구들이 수행되었다. 본 연구는 파이프 내의 이상유동장에서 각 이상유동영역 및 천이경계에서의 특징 파악을 위한 기초 연구로서, 30 mm의 내경을 갖는 수직관의 수직상향류 공기-물 이상유동영역을 고속카메라와 Wire-mesh sensor(WMS)를 이용하여 판별하였다. 또한 유동양식을 정량적으로 판별하기 위해 액막 두께를 적용하였다. 판별한 실험 데이터를 Taitel 외와 Mishima와 Ishii의 유동양식선도와 비교하였다. 실험을 통해 판별한 유동영역은 기존의 유동양식선도와 전체적으로 잘 일치함을 보였다.

Keywords

References

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