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자료유형
학술저널
저자정보
저널정보
대한설비공학회 설비공학논문집 空氣調和·冷凍工學 論文集 제3권 제1호
발행연도
1991.2
수록면
51 - 60 (10page)

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The aim of this study is to investigate the heat transfer characteristics in the transient cooling process of a high temperature wall. The slow transient cooling experiment was carried out with a copper block of high thermal capacity. The results of these experiments are as follows.
1. Temperature histories measured by the thermocouple, which is 0.99, 2.00, 2.99㎜ from the heat transfer surface showed monotonous during the cooling process. These variation are the curves of typical temperature histories in film-boiling, transition-boiling, and nucleate-boiling regions.
2. The temperature histories were measured by thermocouple installed in the copper block. The variations of the surface heat fluxes and surface temperature were computed from the numerical solution method TDMA from the measured temperature histories for radial position one dimensional heat transfer inverse problem. The boiling curves were found by the computed temperature histories.
3. The rewetting point which starts to change from film boiling to nucleate boiling is not connected with the mass velocity and it were found that the temperature of rewetting point indicated about 100℃.
4. The heat flux of rewetting point was about 10^5㎉/㎡h, at that time, the heat transfer coeficient indicated about 1000 ㎉/㎡h℃ irrelevent to mass velocity.
5. The wall superheat decreases as the pressure increases. But I found that rewetting point appeared under higher condition in the wall temperature.

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ABSTRACT

1. 序論

2. 實驗裝置 및 方法

3. 數値解析

4. 結果 및 考察

5. 結論

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