Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Effects of Sloshing on the Heat Transfer Coefficient of the Vertical Walls in a Membrane Type LNG Cargo Containment System

슬로싱이 멤브레인 타입 LNG 화물창의 수직벽면 열전달계수에 미치는 영향

  • Minchang Kim (Research Institute of Carbon-neutral Energy Machinery, Korea Institute of Machinery and Materials (KIMM)) ;
  • Taehoon Kim (Research Institute of Carbon-neutral Energy Machinery, Korea Institute of Machinery and Materials (KIMM)) ;
  • Hwalong You (Research Institute of Carbon-neutral Energy Machinery, Korea Institute of Machinery and Materials (KIMM)) ;
  • Changhyun Kim (Research Institute of Carbon-neutral Energy Machinery, Korea Institute of Machinery and Materials (KIMM)) ;
  • Yong-Shik Han (Research Institute of Carbon-neutral Energy Machinery, Korea Institute of Machinery and Materials (KIMM)) ;
  • Kyu Hyung Do (Research Institute of Carbon-neutral Energy Machinery, Korea Institute of Machinery and Materials (KIMM))
  • 김민창 (한국기계연구원 탄소중립기계연구소) ;
  • 김태훈 (한국기계연구원 탄소중립기계연구소) ;
  • 유화롱 (한국기계연구원 탄소중립기계연구소) ;
  • 김창현 (한국기계연구원 탄소중립기계연구소) ;
  • 한용식 (한국기계연구원 탄소중립기계연구소) ;
  • 도규형 (한국기계연구원 탄소중립기계연구소)
  • Received : 2024.07.16
  • Accepted : 2024.08.22
  • Published : 2024.10.20
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Abstract

In this study, sloshing effects on the heat transfer coefficient of the vertical walls in a membrane type LNG cargo containment system (CCS) were analyzed. To develop correlations of the heat transfer coefficient incorporating sloshing effects, experiments were conducted to measure the heat transfer coefficient of an oscillating vertical plate. Based on experiments, two different correlations were developed which are each applicable to vertical and horizontal oscillations. Using the developed correlations, the heat flow rate penetrated into the vertical walls in KC-1 CCS was investigated under sloshing conditions. The results showed that the penetrated heat flow rate increases with the sloshing speed, which is defined as the product of the sloshing amplitude and the frequency. The maximum increase ratio of the heat flow rate was found to be about 7.5% at the sloshing speed of 10m/s. Also, it was found that the penetrated heat flow rate more increases when the CCS oscillates in the perpendicular direction to the vertical walls, than the parallel direction to the vertical walls. This study suggests that the increase in wall heat transfer coefficients has to be considered when evaluating the boil-off rate of CCSs that are shaking due to sloshing.

Keywords

Acknowledgement

본 연구는 산업통상자원부 소재부품기술개발 사업의 '액화수소용 섭씨 영하 200 도 이하 100 MPa 급 컴팩트형 열교환기 설계(1세부)/제작(2세부) 기술개발' 과제(1 세부:20022461, 2 세부:20022454)와 한국기계연구원에서 수행 중인 2024년 액체수소공급시스템 핵심 기자재 개발사업(NK249B)의 연구비 지원에 의해 수행되었습니다.

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