HEAT TRANSMISSION WITH BOILING
Journal Article
·
· Nuclear Eng.
OSTI ID:4148829
A review and discussion are presented of the rapidly growing store of knowledge of boiling heat transfer, with special reference to reactor applications. The regimes of boiling heat transfer are illustrated by the "Boiling Curve," which was obtained from experiments on electrically-heated wire immersed horizontally in a water bath. No correlation has been established to govern the boiling curve over all regimes although separate correlations were developed, theoretically and empirically, for convection, nucleate boiling, and film boiling with varying limitations. For nucleate boiling it seems simple enough to state that the remarkable increase in heat flux is caused by the agitation of the vapor bubbles, and although this is a satisfactory explanation, it has not proved sufficient in itself for the development of a theory. The transition from nucleate boiling to film boiling and burnout takes place by way of the Departure from Nucleate Boiling (DNB) point, and occurs very rapidly. For this reason, the DNB flux is regarded as the burn-out flux for reactor design purposes. The influences of pressure, local bulk subcooling or quality, channel geometry, and mass velocity on burn-out are discussed. Equations are tabulated for burn-out correlations; their range of applications, geometry, and pertinent remarks are given. When the boiling and burn-out mechanisms are more fully understood and expressed mathematically, the proper interpre tation of loop test data will be facilitated, and reliable correlation will be made possible. (B.O.G.)
- Research Organization:
- Univ. of Western Ontario, Can.
- NSA Number:
- NSA-15-002753
- OSTI ID:
- 4148829
- Journal Information:
- Nuclear Eng., Journal Name: Nuclear Eng. Vol. Vol: 5
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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