Abstract
Mercury was boiled from type 304 stainless-steel horizontal cylindrical heaters of 3 4 - in/dia . with the system pressure varied from 24 to 1170 mm Hg, pool detph from 7 to 34 cm and sodium concentration from 0 to 0.232 wt%. Increasing system pressure increased the heat-transfer rate at a given condition in pure mercury and mercury containing more than 0.041% sodium; the inverse effect was observed at a sodium concentration of 0.0036%. The effect of pool depth was insignificant especially at high system pressure; local liquid temperatures exceeding the surface saturation value were detected only at great pool depths at low system pressure. Immersion up to 8 weeks had little effect on the type 304 S.S. mirror-finish heating element. Increasing sodium concentration has an adverse effect on the heat-transfer coefficient up to a certain level and then the trend changed. Up to 0.232 wt% of sodium addition in mercury did not raise the heattransfer rate above the comparable value for pure mercury. Boiling results were found reproducible on many spot checks after an initial period of operation of the apparatus.
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