Condensation of steam on the underside of a horizontal surface in the presence of air and helium
Experiments and data analysis for the condensation of steam on the underside of a horizontal surface in a closed vessel are described. Previously reported results for film condensation with air as a noncondensable gas are reviewed and compared with new data with helium as the noncondensable in the same apparatus. Observations, including photographs of the condensate configurations, related to the occurrence of dropwise condensation are also discussed. It is noted that data reproducibility over long periods of time were possible only with film condensation and that with dropwise condensation condensing surface temperatures exhibited large nonuniformities and random fluctuations with time. The well known mass transfer calculational model for accounting for the presence of noncondensable gases had been shown previously to be successful with air. The same model when applied to the helium data was not successful except for small gas contents. It appears that the suppression of convection that would be expected to occur with the less dense gas is counteracted by convection induced by fog or mist formation.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6305466
- Report Number(s):
- CONF-870816-26; ON: DE87011384; TRN: 87-029965
- Resource Relation:
- Conference: 24. national heat transfer conference and exhibition, Pittsburgh, PA, USA, 9 Aug 1987; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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Condensation of steam on the underside of a horizontal surface in the presence of air and helium
Steam condensation on the underside of a horizontal surface
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LMFBR TYPE REACTORS
REACTOR COMPONENTS
STEAM
DROPWISE CONDENSATION
FILM CONDENSATION
WATER COOLED REACTORS
AIR
EXPERIMENTAL DATA
HEAT TRANSFER
HELIUM
NUSSELT NUMBER
SURFACES
BREEDER REACTORS
DATA
ELEMENTS
ENERGY TRANSFER
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FLUIDS
GASES
INFORMATION
LIQUID METAL COOLED REACTORS
NONMETALS
NUMERICAL DATA
RARE GASES
REACTORS
VAPOR CONDENSATION
210100* - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled
210200 - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
210500 - Power Reactors
Breeding
400200 - Inorganic
Organic
& Physical Chemistry