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Gas-saturated pool boiling heat transfer from smooth and microporous surfaces in FC-72.

Author(s) : O'CONNOR J. P., YOU S. M., CHANG J. Y.

Type of article: Article

Summary

The effects of surface treatments and "gassy-subcooling" on pool boiling heat transfer are quantified by testing both smooth and treated surfaces at gassy-subcooling levels from 0 to 40 deg C (101.3 kilopascals) and 40 to 85 deg C (303.9 kilopascals). Incipient and nucleate boiling wall superheats decrease over this range of gassy-subcooling. At gassy-subcooling levels greater than 20 deg C, the boiling curves for the smooth surface indicate two distinct regions governed by different heat transfer mechanisms, one in which the boiling process is influenced by the presence of dissolved gas, the other by boiling of the pure liquid. The critical heat flux (CHF) for each surface continually increases with increased levels of gassy-subcooling and the CHF sensitivity to gassy-subcooling is higher for the treated surface. The CHF increase due to combined surface treatment and gassy-subcooling (85 deg C) is about 400%.

Details

  • Original title: Gas-saturated pool boiling heat transfer from smooth and microporous surfaces in FC-72.
  • Record ID : 1997-3235
  • Languages: English
  • Source: J. Heat Transf. - vol. 118 - n. 3
  • Publication date: 1996/08
  • Document available for consultation in the library of the IIR headquarters only.

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