Heat transfer from a high temperature condensable mixture
A new development in heat transfer is reported. It is concerned with heat transfer from a gaseous mixture that contains a condensable vapor and is at very high temperature. In the past, heat transfer associated with either a condensable mixture at low temperature or a noncondensable mixture at high temperature has been investigated. The former reduces to the classical problem of fog formation in, say, atmosphere where the rate of condensation is diffusion controlled (molecular or conductive diffusions). In the presence of noncondensable gases, heat transfer to a cooler boundary by this mechanism is known to be drastically reduced. In the latter case, where the high temperature mixture is noncondensable, radiative transfer may become dominant and a vast amount of existing literature exists on this class of problem. A fundamentally different type of problem of relevance to recent advances in open cycle MHD power plants and breeder reactor safety is considered. In the advanced coal-fired power plant using MHD as a topping cycle, a condensable mixture is encountered at temperatures of 2000 to 3000/sup 0/. Condensation of the vaporized slag and seed materials at such a high temperature can take place in the MHD generator channel as well as in the radiant boiler. Similarly, in breeder reactor accident analyses involving hypothetical core disruptive accidents, a UO/sub 2/ vapor mixture at 400/sup 0/K or higher is often considered. Since the saturation temperature of UO/sub 2/ at one atmosphere is close to 4000/sup 0/K, condensation is also likely at a very high temperature. Accordingly, an objective of the present work is to provide an understanding of heat transfer and condensation mechanics insystems containing a high temperature condensable mixture. The results of the study show that, when a high temperature mixture is in contact with a cooler surface, a thermal boundary layer develops rapidly because of intensive radiative cooling from the mixture.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6372879
- Report Number(s):
- CONF-781110-13; TRN: 79-005597
- Resource Relation:
- Conference: 71. meeting of the AICHE, Miami, FL, USA, 12 Nov 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
30 DIRECT ENERGY CONVERSION
22 GENERAL STUDIES OF NUCLEAR REACTORS
BREEDER REACTORS
RADIANT HEAT TRANSFER
MHD POWER PLANTS
NUMERICAL SOLUTION
FOG
GASES
MATHEMATICAL MODELS
MIXTURES
SAFETY
VAPOR CONDENSATION
VAPORS
VERY HIGH TEMPERATURE
ATMOSPHERIC PRECIPITATIONS
DISPERSIONS
ENERGY TRANSFER
FLUIDS
HEAT TRANSFER
POWER PLANTS
REACTORS
420400* - Engineering- Heat Transfer & Fluid Flow
300104 - MHD Generators- Duct Engineering & Fluid Dynamics
220900 - Nuclear Reactor Technology- Reactor Safety