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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한기계학회 Journal of Mechanical Science and Technology KSME International Journal Vol.17 No.10
발행연도
2003.10
수록면
1,520 - 1,532 (13page)

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초록· 키워드

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An experiment was performed to obtain the local heat transfer coefficient and Nusselt number in a circular duct with a 180° bend for Re=6X10⁴. 8 X 10⁴ and I X 10^5 under swirling flow and non-swirling flow conditions. The test tube with a circular section was made from stainless steel having a curvature ration of 9.4. Current heat flux of 5.11 kW/m² was applied to the test tube by electrical power and the swirling motion of air was produced by a tangential inlet to the pipe axis at 180°. Measurements of local wall temperatures and the bulk mean temperatures of air were made at four circumferential positions at 16 stations. The wall temperatures showed a reduced distribution curve at the bend for the non-swirling flow. but this effect did not appear for the swirling flow. The Nusselt number distributions for the swirling flow. which was calculated from the measured wall and the bulk temperatures. were higher than that of the non-swirling flow. The average Nusselt number of the swirling flow increased by about 90­100%. compared to that of the non-swirling flow. The Nu/Nu_DB values at the 90° station for non-swirling flow and swirling flow were approximately 2.5 and 4.8 at Re=6X10⁴ respectively. The values agree well with Said's results for non-swirling flow.

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Abstract

1.Introduction

2.Experimentation

3.Results and Discussions

4.Conclusion

Acknowledgment

References

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