Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2003.04a
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- Pages.2219-2226
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- 2003
Effect of Crossflow on Heat (Mass) Transfer of an Impingement/Effusion Cooling System
충돌제트/유출냉각기법에서 횡방향유동이 열/물질전달에 미치는 영향
- Published : 2003.04.23
Abstract
Two perforated plates are placed in parallel and staggered arrangements with a gap distance of 2 times of the hole diameter, and initial crossflow passes between the plates. Both the injection and effusion hole diameters are 10 mm, and the Reynolds number based on the hole diameter and hole-to-hole pitch are fixed to 10,000 and 6 times of the hole diameter, respectively. To investigate the effect of crossflow, the flow rate of crossflow is changed from 0.2 to 2 times of that of the impinging jet. A naphthalene sublimation method is used to determine the local heat/mass transfer coefficients on the upward facing surface of the effusion plate. With the initial crossflow, the heat/mass transfer rates on the effusion (target) plate decrease as the velocity of crossflow increases, since the crossflow induces the locally low transfer regions formed at the mid-way between the effusion holes. However, the impingement/effusion cooling with crossflow presents higher heat/mass transfer rates than the array jet impingement cooling with the same initial crossflow.
Keywords
- Gas Turbine;
- Impingement Cooling;
- Effusion Cooling;
- Initial Crossflow;
- Heat and Mass Transfer Analogy
- 가스터빈;
- 충돌제트냉각;
- 유출냉각;
- 초기 횡방향유동;
- 열전달과 물질전달 상사성;