대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)
- 제20권1호
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- Pages.266-274
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- 1996
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
수직 환상관내 반류 공기-물 유동에서 직접분사방식에 따른 플러딩 시작점 특성
Characteristics of the Onset of Flooding for Countercurrent Air-Water Flow in Vertical Annuli with a Direct Injection Mode
- 이상천 (영남대학교 기계공학과) ;
- 신익호 (영남대학교 대학원 기계공학과) ;
- 이상무 (영남대학교 대학원 기계공학과) ;
- 정모 (영남대학교 기계공학과) ;
- 김동수 (한국원자력연구소) ;
- 장원표 (한국원자력연구소)
- Lee, S.C. (Dept.of Mechanical Engineering, Yeungnam University) ;
- Shin, I.H. (Dept.of Mechanical Engineering, Graduate School of Yeungnam University) ;
- Lee, S.M. (Dept.of Mechanical Engineering, Graduate School of Yeungnam University) ;
- Chung, M. (Dept.of Mechanical Engineering, Yeungnam University) ;
- Kim, D.S. (Korea Atomic Energy Research Institute) ;
- Chang, W.P. (Korea Atomic Energy Research Institute)
- 발행 : 1996.01.01
초록
An experimental work was conducted to investigate the characteristics of the onset of flooding in vertical annuli with a direct injection mode using air and water. The onset of flooding was determined by means of pressure drop measurement while the air velocity was increased gradually under fixed liquid flow rates. Data of the onset of flooding were collected for various combinations of the tube size and the nozzle number. A theoretical analysis of the onset of flooding was also performed based on an envelope theory. The result shows that the onset of flooding in small-scale annuli can be predicted relatively well by the theory. A modified Wallis parameter was used to investigate the scaling effect of flooding phenomena in the annuli, indicating a relatively reasonable result. The number of nozzle has no effect on the flooding velocity when liquid was injected through 2, 3, 4 and 6 nozzles but the initiation of flooding was significantly expedited when 12 nozzles were employed for liquid injection.