정사각 덕트 초임계 상태 이산화탄소 가스 냉각과정 중 2차 유동 특성 측정 연구Experimental Study on the Secondary Flow Characteristics of a Supercritical Carbon Dioxide Flow in a Gas Cooling Process Within a Square Duct
- Other Titles
- Experimental Study on the Secondary Flow Characteristics of a Supercritical Carbon Dioxide Flow in a Gas Cooling Process Within a Square Duct
- Authors
- 최영돈; 한성호; 서정식; 김용찬; 김민수
- Issue Date
- 2008
- Publisher
- 대한기계학회
- Keywords
- LDV(레이저 도플러 유속계); Supercritical-Point(초임계점); Carbon Dioxide(이산화탄소); Refrigerant(냉매); Gas Cooling(가스쿨링)
- Citation
- 대한기계학회논문집 B, v.32, no.2, pp.158 - 165
- Indexed
- SCOPUS
KCI
- Journal Title
- 대한기계학회논문집 B
- Volume
- 32
- Number
- 2
- Start Page
- 158
- End Page
- 165
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/124653
- ISSN
- 1226-4881
- 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.
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