표제지
목차
Abstract 7
Nomenclature 10
Greek symbol 11
제1장 서론 15
1.1. 연구배경 15
1.2. 연구의 필요성 및 목적 18
1.3. 연구 동향 21
제2장 기본 이론 22
2.1. 극저온 상의 열전달 기본원리 22
2.2. 진공재킷 밸브의 열전달 이론 24
제3장 실험 27
3.1. 실험개요 27
3.2. 실험결과 31
제4장 수치해석 조건 34
4.1. 수치해석 변수조건 34
4.2. 수치해석 형상 설계 38
4.3. 수치해석 경계조건 40
4.4. 수치해석 격자 의존성 43
제5장 수치 해석 결과 고찰 50
5.1. 밸브 내부의 열전달 50
5.2. 2.0D 진공재킷 58
5.3. 2.5D 진공재킷 62
5.4. 3.0D 진공재킷 66
5.5. 진공재킷 크기에 따른 시뮬레이션 결과분석 70
5.6. 실험과 시뮬레이션 결과비교 71
제5장 결론 72
참고문헌 73
APPENDIX 75
Table 1.1. Carbon emission factor (IPCC 2006) 16
Table 3.1. Experiment condition 30
Table 4.1. Variation of analysis 36
Table 4.2. Flow visualization equipment information 37
Table 4.3. Boundary conditions 41
Table 4.4. Radiation emissivity of SS304 42
Fig. 1.1. Primary energy supply composition cost 17
Fig. 1.2. Global energy trade volumes 17
Fig. 1.3. Example of insulation layer crashed 20
Fig. 1.4. Multi layer insulation & vacuum jacket insulation valve 20
Fig. 1.5. Result of conductivity according to insulation... 21
Fig. 2.1. Valve design with vacuum jacket 26
Fig. 3.1. Concept of experiment 28
Fig. 3.2. Detailed valve assemble 28
Fig. 3.3. Temperature measuring point 29
Fig. 3.4. Arrangement of experiment 29
Fig. 3.5. Outer surface temperature at different measuring points 31
Fig. 4.1. 3D Modelling of the glove valve 39
Fig. 4.2. Model simplification for optimum...(그림없음) 39
Fig. 4.3. Setup of computational domain 42
Fig. 4.4. Mesh structure and quality 44
Fig. 4.5. Compression of different mesh density 49
Fig. 5.1. Initial heat transfer process 51
Fig. 5.2. Accelerated heat transfer process 53
Fig. 5.3. Unwavering heat transfer process 55
Fig. 5.4. Flow patterns of the valve 57
Fig. 5.5. Calculation point of heat distribution 59
Fig. 5.6. Temperature variation in case of 2D thickness 59
Fig. 5.7. Overall assessment of temperature variation at 2.0D 61
Fig. 5.8. Temperature variation in case of 2.5D thickness 63
Fig. 5.9. Overall assessment of temperature variation at 2.5D 65
Fig. 5.10. Temperature variation in case of 3.0D thickness 67
Fig. 5.11. Overall assessment of temperature variation at 3.0D 69
Fig. 5.12. Comparison of jacket insulation surface temperature 70
Fig. 5.13. Comparison of experiment and simulation 71