Abstract
The fraction of steam which condenses as an aerosol in the cooling through surfaces of a well-mixed steam-air mixture confined in a cavity is calculated. A previous theory which predicts this fraction is extended so as to allow supersaturations, S, to occur in boundary layers, and the fraction is shown to be rapidly varying towards its maximum value which occurs in the saturated limit, S = 1. Only when the cooling surfaces are cold is the fractional aerosol condensation predicted to be large, and the aerosol is expected to evaporate slowly for small bulk-wall temperature differences. Results applicable to the cooling of PWR containments by water sprays are obtained. They indicate that it is unlikely that any net aerosol growth is produced.
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