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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2003년 춘계학술대회논문집
발행연도
2003.4
수록면
1,491 - 1,498 (8page)

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초록· 키워드

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Droplet evaporation can be used to transfer large amounts of energy since heat is transferred across a thin
liquid film. Spreading the drop over a larger area can enhance this heat transfer. One method of accomplishing
this is to dissolve gas into the liquid. When the drop strikes the surface, a gas bubble nucleates and can grow
and merge within the liquid, resulting in an increase in the droplet diameter. In this study, time and space resolved
heat transfer characteristics for a single droplet striking a heated surface were experimentally investigated.
The local wall heat flux and temperature measurements were provided by a novel experimental technique
in which 96 individually controlled heaters were used to map the heat transfer coefficient contour on the
surface. A high-speed digital video camera was used to simultaneously record images of the drop from below.
The measurements to date indicate that significantly smaller droplet evaporation times can be achieved. The
splat diameter was observed to increase with time just after the initial transient dies out due to the growth of
the bubble, in contrast to a monotonically decreasing splat diameter for the case of no bubbles. Bursting of the
bubble corresponded to a sudden decrease in droplet heat transfer.

목차

Abstract

1. Introduction

2. Experimental Apparatus

3. Data Reduction and Uncertainty Analysis

4. Results and Discussion

5. Conclusion

Acknowledgments

References

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UCI(KEPA) : I410-ECN-0101-2009-550-014204471