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자료유형
학술저널
저자정보
저널정보
한국마린엔지니어링학회 Journal of Advanced Marine Engineering and Technology (JAMET) 한국마린엔지니어링학회지 제29권 제3호
발행연도
2005.5
수록면
10 - 24 (15page)

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An experimental investigation was performed to study the characteristics of turbulent swirling flow in the cylindrical annuli. The swirl angle measurements were performed by flow visualization technique using smoke and dye liquid. By using the particle image velocimetry method, this study has found the time-mean velocity distribution and turbulent intensity with swirl for Re=20,000, 30,000, 50,000, and 70,000 along longitudinal sections. The results appear to be physically reasonable.
Other experimental study was performed to investigate heat transfer characteristics of turbulent swirling air flow in axisymmetric annuli. The static pressure, the local air flow temperature, and the wall temperature with decaying swirl were measured by using thermocouples and the friction factor and the local Nusselt number were calculated for Re=30,000, 50,000 and 70000. The local Nusselt number was compared with that obtained from the Dittus-Boelter equation with swirl and without swirl, respectively. The results showed that the swirl enhances the heat transfer at the inlet and the outlet of the test tube.

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Abstract

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1. Introduction

2. Experimental Apparatus

3. Results and Discussion

4. Heat Transfer Results

5. Conclusions

Acknowledgments

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