Heat transfer in boiling liquified gas

Means for increasing heat transfer characteristics between a boiling liquid and the surface of a solid at a temperature above the temperature of the boilng liquid and in which the solid is immersed whereby an unstable vapor film ordinarily forms at the surface to interfere with the heat transfer efficiency between the surfaces of the solid and the liquid comprising providing means for eliminating at least a part of any unstable vapor film which forms on the surface of said solid, said means consisting essentially of a multiplicity of passages which extend through the solid to openings at the surface of said solid in which the openings are dimensioned to constitute up to 1% of the surface area and with the passages being dimensioned to enable circulation of liquid through said passages for emergence as a liquid from the openings at the surface for passage through any unstable vapor film formed on the surface to eliminate at least a portion of the unstable vapor film.