Abstract
A microthermocouple probe to detect liquid contacts on a high-temperature surface during film and transition boiling regimes is described. Experiments indicate the probe and its associated data recording and processing circuits have sufficiently rapid response to provide quantitative measurements of individual liquid contacts, permitting calculations of contact frequencies and durations, and of average vapor versus liquid contact time fractions. Initial experimental results for pool boiling of saturated water at atmospheric pressure, in the quenching of a high-temperature copper block, indicated that the liquid contact time fraction increased from 10% to 65% in 7 s as the block surface temperature cooled from 483 to 418 K.
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