Abstract
The breakdown of liquid films may be the cause of burnout in the higher quality regimes of two-phase steam-water flow. An investigation of the breakdown of the liquid film in air-water annular flow is reported, which shows that the films can exist in a metastable state and will not break down unless there is an external disturbance. If such a disturbance is provided in the form of a dry patch on the solid surface then the minimum water flow rate at which the patch will be re-wetted decreases as the velocity of the gas phase increases.
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