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Prediction of the effective thermal conductivity of microsphere insulation

첫 페이지 보기
  • 발행기관
    한국초전도저온학회 (구 한국초전도저온공학회) 바로가기
  • 간행물
    초전도와 저온공학 바로가기
  • 통권
    16권 1호 (2014.01)바로가기
  • 페이지
    pp.36-41
  • 저자
    Lingxue Jin, Jiho Park, Cheonkyu Lee, Mansu Seo, Sangkwon Jeong
  • 언어
    영어(ENG)
  • URL
    https://www.earticle.net/Article/A216302

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원문정보

초록

영어
Since glass microsphere has high crush strength, low density and small particle size, it becomes alternative thermal insulation material for cryogenic systems, such as storage and transportation tank for cryogenic fluids. Although many experiments have been performed to verify the effective thermal conductivity of microsphere, prediction by calculation is still inaccurate due to the complicated geometries, including wide range of powder diameter distribution and different pore sizes. The accurate effective thermal conductivity model for microsphere is discussed in this paper. There are four mechanisms which contribute to the heat transfer of the evacuated powder: gaseous conduction (kg), solid conduction (ks), radiation (kr) and thermal contact (kc). Among these components, kg and ks were calculated by Zehner and Schlunder model (1970). Other component values for kc and kr, which were obtained from experimental data under high vacuum conditions were added. In this research paper, the geometry of microsphere was simplified as a homogeneous solid sphere. The calculation results were compared with previous experimental data by R. Wawryk (1988), H. S. Kim (2010) and the experiment of this paper to show good agreement within error of 46%, 4.6% and 17
% for each result.

목차

Abstract
 1. 서론
 2. 마이크로스피어 열전달 모델
 3. 실험 장치 및 실험 방법
 4. 계산 결과 및 검증
 5. 결론
 ACKNOWLEDGMENT
 REFERENCES

키워드

microsphere the effective thermal conductivity porous media

저자

  • Lingxue Jin [ Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ]
  • Jiho Park [ Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ]
  • Cheonkyu Lee [ Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ]
  • Mansu Seo [ Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ]
  • Sangkwon Jeong [ Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea ] Corresponding author

참고문헌

자료제공 : 네이버학술정보

간행물 정보

발행기관

  • 발행기관명
    한국초전도저온학회 (구 한국초전도저온공학회) [The Korean Society of Superconductivity and Cryogenics (KSSC)]
  • 설립연도
    1998
  • 분야
    공학>전기공학
  • 소개
    21세기 핵심기술인 초전도공학과 저온공학분야의 기술 수준을 향상시키고, 선진 외국의 관련 학회와의 국제 교류 뿐만 아니라 이 분야에서 산.학.연의 학술활동 및 기술교류의 구심점으로의 그 역할을 성실히 수행하고자 한다.

간행물

  • 간행물명
    초전도와 저온공학 [Superconductivity and Cryogenics]
  • 간기
    연간
  • pISSN
    1229-1706
  • 수록기간
    1999~2025
  • 십진분류
    KDC 427 DDC 537

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