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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.20 No.3
발행연도
2006.3
수록면
399 - 408 (10page)

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초록· 키워드

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Nucleate pool boiling heat transfer coefficient (HTCs) were measured with one nonazeotropic mixture of propane/isobutane and two azeotropic mixtures of HFC134a/isobutane and propane/HFC134a. All data were taken at the liquid pool temperature of 7℃ on a horizontal plain tube of 19.0㎜ outside diameter with heat fluxes of 10 ㎾/㎡ to 80 ㎾/㎡ with an interval of 10 ㎾/㎡ in the decreasing order of heat flux. The measurements were made through electrical heating by a cartridge heater. The nonazeotropic mixture of propane/isobutane showed a reduction of HTCs as such as 41% from the ideal values. The azeotropic mixtures of HFC134a/isobutane and propane/HFC134a showed a reduction of HTCs as much as 44% from the ideal values at compositions other than azeotropic compositions. At azeotropic compositions, however, the HTCs were even higher than the ideal values due to the increase in the vapor pressure. For all mixtures, the reduction in heat transfer was greater with larger gliding temperature difference. Stephan and Korner's and Jung et al's correlations predicted the HTCs of mixtures with a mean deviation of 11%. The largest mean deviation occurred at the azeotropic compositions of HFC132a/isobutane and propane/HFC134a.

목차

Abstract

Nomenclature

1. Introduction

2. Experiments

3. Results and Discussion

4. Conclusions

Acknowledgements

References

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