Abstract
In pool boiling, when the burnout heat flux is approached, a large number of areas are observed where the heating surface is dry for short intervals. The mechanism of formation of these dry areas is different for atmosphere and low-pressure conditions. The majority of dry areas do not lead to burnout. but the odd one is suddenly fatal when it grows to cover the entire heating surface. This suddenly different behaviour can be explained qualitatively by considering the conduction of heat along the heating surface, for which a modified interpretation of the boiling curve must be used. A critical size is found beyond which dry areas keep growing. The stability properties of both nucleate and film boiling are found to depend on the imposed heat flux and explain the familiar form of the boiling curve.
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