정사각 덕트 초임계 상태 이산화탄소 가스 냉각과정 중 2차 유동 특성 측정 연구

다국어 초록 (Multilingual Abstract)

The carbon dioxide properties change sharply near the critical or pseudo-critical point in the heat transfer processes. The reduction in turbulent, convective heat transfer parameters observed in some supercritical data and in experiments with common gases can be due to property variation, acceleration, buoyancy or combinations of these phenomena, depending on the conditions of the applications. In this study, the measurement for the secondary flow driven by buoyancy was carried out on the supercritical carbon dioxide turbulent flows in the different boundary condition with the constant mass flow rate. The available measuring techniques were used to clarify the behaviour of any supercritical fluid. Laser Doppler Velocimeter (LDV) and a special device was used to measure the secondary velocity and turbulent characteristics of the supercritical flows.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 측정 이론
• 3. 결과 및 고찰
• 4. 결론
• 후기
• 참고문헌

참고문헌 (Reference)

1 최영돈, "타원혼합모형을 이용한 초임계상태 이산화탄소의 압축성계수에 의한 난류열전달 특성" 대한기계학회 31 (31): 40-50, 2007

2 Hwang, Y, "Theoretical Evaluation of Carbon Dioxide Refrigeration Cycle" 4 (4): 245-263, 1998

3 Lorentzen, G., "The Use of Natural Refrigerants: A Compete Solution to the CFC/ HCFC Replacement" 18 (18): 190-197, 1994

4 Pettersen, J, "Development of Compact Heat Exchangers for Co2 Air-Conditioning Systems" 21 (21): 180-193, 1998

5 Srinivas, S. P, "Convective Heat Transfer from In-tube Cooling of Turbulent Supercritical Carbon Dioxide: Part 2-Experimental Data and Numerical Predictions" 7 (7): 367-382, 2001