Transient boiling of liquefied cryogens on a water surface: I. Nitrogen, Methane and Ethane

Abstract An experimental study of the transient boiling rates of pure liquefied nitrogen, methane, and ethane on a water surface is reported. Measured heat fluxes were lowest for nitrogen and highest for ethane. The former is believed to film boil on a water-ice surface while ethane nucleate boils on a solid ice or hydrate crust formed very early in the run. Liquefied methane data fall between those of nitrogen and ethane. For spills of all three cryogens, the water temperatures several mm below the surface did not change appreciably but only decreased very slowly during a test. Significant vapor superheat was noted for liquid nitrogen spills but not when methane or ethane boiled on the water-ice surface.

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