Liquid flowing out of a pressurized tank will flash atomize if the liquid superheat (temperature difference above the boiling point) is large enough. Fthenakis claimed, “The critical superheat typically ranges from 5 to 15K [9 to 27°F] for many fluids of interest.”1 Flash atomization is the shattering of liquid jets into very small (often submicron) aerosol droplets due to the rapid vapor bubble growth of boiling. By contrast, subcooled (below the boiling point) liquid jets will still atomize when exiting an orifice, but then to droplets that are orders of magnitude larger, hundreds of microns in diameter.
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Flash Atomization of HF and MHF (Wonkish)