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자료유형
학술저널
저자정보
저널정보
대한설비공학회 설비공학논문집 공기조화·냉동공학 논문집 제12권 제1호
발행연도
2000.1
수록면
50 - 58 (9page)

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초록· 키워드

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Experiments were carried out to obtain the effects of nozzle configuration and jet to jet spacing on the heat transfer characteristics of single line of circular water jets impinging on a constant heat flux plane surface. The nozzle configurations are Cone type, Reverse cone type and Vertical circular type, and the nozzle arrays are single jet(nozzle dia. 8㎜), 1 row of 3 jets and 1 row of 5 jets. Jet velocities ranging from 3㎧ to 8㎧ were investigated for the nozzle to target plate spacing of 80 ㎜.
For the Cone and Reverse cone type nozzle arrays, the average Nusselt number of 1 row of 5 jets was larger than that of 1 row of 3 jets at Re_D<45000, but that of 1 row of 3 jets was larger than that of 1 row of 5 jets at Re_D≥45000. For the Vertical circular type nozzle, however, the average Nusselt number of 1 row of 3 jets was larger than that of 1 row of 5 jets at all jet velocities. In the condition of fixed mass flow rates, the maximum heat transfer augmentation was obtained for 1 row of 5 jets and was over 2 times larger than that of the single jet for all nozzle configurations. The nozzle configurations that produce the maximum average Nusselt number are as follows: For 1 row of 3 jets, the Vertical circular type at Re_D≤45000 and the Reverse cone type at Re_D>45000. But, they are the Reverse cone type at Re_D<55000 and the Vertical circular type at Re_D≥55000 for 1 row of 5 jets.

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ABSTRACT

1. 서론

2. 실험장치 및 방법

3. 실험결과 및 고찰

4. 결론

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UCI(KEPA) : I410-ECN-0101-2010-553-001514379