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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.21 No.12
발행연도
2007.12
수록면
2,168 - 2,177 (10page)

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초록· 키워드

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The results of the condensation heat transfer enhancement and pressure drop of HFC-134a by using the electrohydrodynamic (EHD) technique are presented. The test section is a horizontal tube-in-tube heat exchanger where the refrigerant flows in the inner tube and water flows in the annulus. The outer tube is a smooth copper tube having outer diameter of 21.2 ㎜. Two types of inner tubes, smooth and micro-fin copper tubes, are tested. The outer diameter and length of both inner tubes is 9.52 ㎜ and 2.5 m, respectively. A stainless steel cylindrical electrode of 1.47 ㎜ in diameter is placed in the center of the tube. Experiments are conducted under conditions providing mass flux of 400 ㎏/㎡s, saturated temperature of 40 ℃, heat flux of 20 ㎾/㎡ and applied voltage of 2.5 ㎸. The experimental results indicate that the EHD enhancements of the smooth tube are higher than those of the micro-fin tube over the range of average quality. The maximum heat transfer enhancements for smooth and micro-fin tubes are 1.1 times and 1.08 times, respectively. For a smooth tube, the pressure drop induced by EHD is considerably small. However, the application of EHD in a micro-fin tube can lead to 10 % increase in the pressure drop.

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Abstract
1. Introduction
2. Experimental apparatus and method
3. Data reduction
4. Results and discussion
5. Conclusion
Acknowledgments
References

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