Abstract
Evidence is presented demonstrating effects of pressure-temperature history on conditions for initiation of nucleate pool boiling in water under a range of conditions. Boiling phenomena were studied using platinum-wire heating elements. Element temperature, pressure or heat flux, and boiling initiation time were monitored during both increasing-power and decreasing-pressure transients. It was found that, if the system were subjected to highly subcooled (over-pressure) conditions prior to a transient, nucleate boiling was significantly suppressed. Results agree qualitatively with predictions of a model based on contact-angle hysteresis in movement of the liquid-vapor meniscus in a boiling nucleation site.
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