Journal of Mechanical Science and Technology

, Volume 24, Issue 12, pp 2555–2560 | Cite as

Effects of upper inflow area on pool boiling in vertical annulus with closed bottoms

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Abstract

The upper inflow area was changed to identify its effects on the pool boiling heat transfer of saturated water at atmospheric pressure in a vertical annulus with closed bottoms. The inside surface of a 25.4 mm diameter tube was heated. The ratio between the gaps measured at the upper and lower regions of the annulus ranged from 0.18 to 1. Two different lengths of modified gap were investigated. The effects of the inflow area on heat transfer became evident as the heat flux increased and the gap ratio decreased. If the gap ratio was smaller than 0.51 and the height of the interrupter was 10 mm, a significant change in heat transfer was observed. This was attributed primarily to the formation of a lumped bubble around the upper regions of the annulus and the generation of active liquid agitation in the annular gap space.

Keywords

Annulus Heat transfer Inflow area Pool boiling Vertical tube 
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References

  1. [1]
    M. H. Chun and M. G. Kang, Effects of heat exchanger tube parameters on nucleate pool boiling heat transfer, ASME J. Heat Transfer, 120 (1998) 468–476.CrossRefGoogle Scholar
  2. [2]
    M. Shoji, Studies of boiling chaos: a review, Int. J. Heat Mass Transfer, 47 (2004) 1105–1128.CrossRefGoogle Scholar
  3. [3]
    S. C. Yao and Y. Chang, Pool boiling heat transfer in a confined space, Int. J. Heat Mass Transfer, 26 (1983) 841–848.CrossRefGoogle Scholar
  4. [4]
    Y. H. Hung and S. C. Yao, Pool boiling heat transfer in narrow horizontal annular crevices, ASME J. Heat Transfer, 107 (1985) 656–662.CrossRefGoogle Scholar
  5. [5]
    M. G. Kang and Y. H. Han, Effects of annular crevices on pool boiling heat transfer, Nuclear Engineering and Design, 213 (2002) 259–271.CrossRefGoogle Scholar
  6. [6]
    M. G. Kang, Pool boiling heat transfer on a vertical tube with a partial annulus of closed bottoms, Int. J. Heat Mass Transfer, 50 (2007) 423–432.MATHCrossRefGoogle Scholar
  7. [7]
    J. Bonjour and M. Lallemand, Flow patterns during boiling in a narrow space between two vertical surfaces, Int. J. Multiphase Flow, 24 (1998) 947–960.MATHCrossRefGoogle Scholar
  8. [8]
    Y. Fujita, H. Ohta, S. Uchida and K. Nishikawa, Nucleate boiling heat transfer and critical heat flux in narrow space between rectangular spaces, Int. J. Heat Mass Transfer, 31 (1988) 229–239.CrossRefGoogle Scholar
  9. [9]
    J. C. Passos, F. R. Hirata, L. F. B. Possamai, M. Balsamo and M. Misale, Confined boiling of FC72 and FC87 on a downward facing heating copper disk, Int. J. Heat Fluid Flow, 25 (2004) 313–319.CrossRefGoogle Scholar
  10. [10]
    M. G. Kang, Pool boiling heat transfer in a vertical annulus as the bottom inflow area changes, Int. J. Heat Mass Transfer, 51 (2008) 3369–3377.CrossRefGoogle Scholar
  11. [11]
    H. W. Coleman and W. G. Steele, Experimentation and Uncertainty Analysis for Engineers, 2nd Ed., John Wiley & Sons (1999).Google Scholar
  12. [12]
    W. M. Rohsenow, A method of correlating heat-transfer data for surface boiling of liquids, ASME J. Heat Transfer, 74 (1952) 969–976.Google Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Department of Mechanical Engineering EducationAndong National UniversityKyungbukKorea

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